Home

LFI-3751 Product Data Sheet

1. 46 Chapter 2 Front Panel Operation Controlling Temperature with an AD590 decrease ace 5 Adjust C Enter Offset C1 Display Actual AD590 Temperature Display AD590 Setpoint Temperature decrease 2 increase Entering Data Point C Rotate the Display Select Switch to C Shift Button ON to display the AD590 Offset in uA Rotate the Digi Pot Adjust Knob to change the value Factory default is 0 pA A B and C cannot be adjusted while the output is on Data pairs A B and C are saved in non volatile memory RS 232 Command C1 Offset Display Resolution Offset 9 99 to 9 99 uA Displaying Actual AD590 Temperature Rotate the Display Select Switch to ACT T Shift Button OFF to display the AD590 temperature RS 232 Command ACT T Display Resolution 199 9 to 20 0 C 19 99 to 99 99 C 100 0 to 199 9 C Adjusting AD590 Temperature Setpoint Rotate the Display Select Switch to SETT Shift Button OFF Temperature will be displayed To adjust the setpoint rotate the Digi Pot Adjust Knob While the knob is rotating the display will change but the instrument will not control to the new setpoint until the knob stops moving The decimal point will move to display maximum resolution SET T is saved in non volatile memory RS 232 Command SET T 47 ACTT SETT ZIN O TEI TEV LMI AUXT BOE Geb Default LM335 Configuration A 3 000
2. cescceseesseesseeeeeneeeeeeeeeeeneeeeseeeneeesneesseeesneeeeeees 45 Controlling Temperature with an LM335 ccceseeseeeseeseeeeeeeneeeeeeeeeenseeseeeenseaeseesneeeseneeseness 48 Controlling Temperature with an LM35 ccsecceeeeseeneeeeseeeeeneeeeeeeeeeeaeeeeseesneeeeseesseeeseeeeeenees 51 Sensor Error CONGMOM sai ciscceseccscsccsecsssiieeaceeee vend sccutatedendeevenndeensseeuecuedseutecbetiacwesenetiecseuecocees 55 Setting Limit Cumrentss sic ciiccescccsccescceses seeesseees ctevectevecscasece secessteneccecacesasccscned satececcestitsaaceconces 56 Setting Temperature Limits inne csicesscccsceretecetececcsseadeendie exaseseceasnedsecececeevicweckessatevitescaiesseeescecas 57 Manually Setting the P I and D Constant cscceeeseeeseeeeeeeeeeeeeneeeeseeeneeeeeeeeneeeeeeeeeeees 58 Setting Operating Temperature or Resistance ccecceecseeeeeeseeeeeseeeeeeenseeeseesnseeseeeeeenes 60 Enabling Output Current iiss incccccccccccestccceceseseccteescescacteseevs saevcacteeccedacusvensccerssccececedveavvencesueess 61 Measuring Thermoelectric Current and Voltage ccceccssessecesseeeseeseeseeeeeseesseeeeeeeeeseees 62 Measuring Auxiliary Thermistor Temperature ssessssuusenunssnunnnnunnnnnnnnnnnnnunnnnnnnnnnnnnnnnnnnnnnn 63 Setting the RS 232 ACdIeSS cc01ccescccticeceieenteenceeestsectereseeseneeensessneeentesseneesneesnnecsnereneees 66 Operating with Resistive Heaters ccsecsseeeeeeeseeseeeseeeseeeeenseseeea
3. GO 0O07 A Remote RS 232 Press and Hold Output shuts off Operation TEMP LIMIT and Press Unit remains in OUTPUT BUTTON to RS 232 operation shut output off Revert to Local Mode Operation Enable Disable Output Current OPERATE VIA TEMP LIMIT REVERT TO NIZ RS 232 BUTTON LOCAL OPERATION ON E N O PRESS amp A N PRESS amp REMOTE REMOTE RELEASE RELEASE RS 232 O RS 232 al as _ gt ni Press amp Hold Output Current Output Current Output Current 7IN for more than 3 seconds Disabled Enabled Disabled The Front Panel at a Glance Quick Autotune PID Operation Quick Autotune PID Operation Step 1 Adjust the Limit Current below the rated maximum current for your thermoelectric or resistive heater N Positive LIM I Step 2 Adjust the Temperature Setpoint to your desired operating temperature Continued next page decrease N increase 0 00 to 5 00 Amps decrease S increase _temperature C or resistance kQ displayed 199 9 C to 199 9 C or 0 to 500 kQ The Front Panel at a Glance Quick Autotune PID Operation Quick Autotune PID Operation continued decrease x Step 3 Adjust the P term to display AutS or Autd increase Setpoint Ambient AutS Setpoint Response Optimization Kuis or Auld b lei Autd Disturbance Rejection Optimization Wait about two seconds before enabling the output current Begin Autotune Optimizat
4. Signifies the start of a Command Packet Signifies the start of a Response Packet 1 Temperature Controller 2 Laser Diode Driver RS 232 address of the unit as set on the front panel of the unit 00 is reserved 1 Read data 2 Write data Specifies the type of command to initiate See Command Code Listing for detail Response indicating action success or failure See End Code Listing for detail Data must match this format exactly A sign character is followed by three digits a decimal point and three digits Data is decimal and between 999 999 and 999 999 Number used to check the data received and sent See Calculating FCS for detail Carriage Return and Line Feed included in Response Packet Chapter 4 Remote Interface Reference Standard Command Code Listing Standard Command Code Listing Command Command Command ui Code Description and Field Range ACT T Actual Temperature Measurement ACTR Actual Sensor Resistance remot B SEI Temperature Setpoint 199 900 to 199 900 C SET R Resistance Setpoint 000 000 to 499 900 kQ TE Thermoelectric Current Measurement 1 TEV Thermoelectric Voltage Measurement LIM I POSITIVE Positive Current Limit 000 000 to 005 000 Amps LIM NEGATIVE Negative Current Limit 005 000 to 000 000 Amps AUX T Auxiliary Sensor Temperature Measurement P Proportional Gain 002 000 Setpoint Response Autotune 001 000 Disturbance Rejection Autotune 000 000 t
5. Temperature Resistance data X In R x In R pairs that you enter Using the Steinhart Hart equation the temperature controller converts the thermistor resistance to a displayed temperature Calibration is more accurate when the data pairs are close to the desired operating temperature For this example 25 C is the goal Calibrating this 10 kQ thermistor with 10 C 25 C and 40 C will offer a wide range of Graph of Resistance vs operation as well as 0 01 C accuracy Temperature for TCS 610 10 kQ Thermistor Resistance kQ T Temperature Kelvin R Resistance Ohms Rotate the Display Select Switch to A and toggle the Shift Button ON A temperature and a resistance will alternate on the display See the unit of measure LEDs to determine if it is the temperature or resistance value For the 10 kQ thermistor in this example we choose A B and C to be 10 C 19 9 kQ 25 C 10 kQ and 40 C 5 326 kQ respectively This 15 T2 R2 information is available from the thermistor manufacturer usually in table T1 R1 10 l as form Use the Digi Pot Adjust Knob to change either value when it is displayed Rotate the Display Select Switch to B then C making any necessary adjustments 0 10 20 30 40 50 Temperature C RN gt 7 gt 17 Positive LIM I Chapter 1 Quick Start Nine Steps to Operating the LFI 3751 3 Set Limit Current With the output off set the limit current
6. When a is in Character 7 Characters 6 through 0 are ignored when writing Character 6 determines the feedback polarity A thermistor is a Negative Temperature Coefficient Sensor All others are Positive Temperature Coefficient Sensors You can combine settings to integrate a unique sensor For example if you need 11 mA bias current you can set Character 4 and Character 2 to 1 to produce an 11 mA bias current When reading the Sensor Bias Configuration the Command Type changes from a WRITE 2 to a READ 1 Read 1101141 000 00020 Reads Sensor Bias Configuration This helps you determine what sensor configuration the instrument is using 93 Chapter 4 Remote Interface Reference Measuring Actual Temperature or Resistance Measuring Actual Temperature or Resistance RS 232 Commands Discussed e To measure actual sensor temperature from an instrument send the following Command Packet ACT T ACT R Read 1101101 000 00024 Reads ACT T in C e To measure actual sensor resistance from an instrument send the following Command Packet Read 1101102 000 00027 Reads ACT R in kQ 94 RS 232 Commands Discussed LIM I POSITIVE LIM NEGATIVE Chapter 4 Remote Interface Reference Setting the Limit Currents Setting the Limit Currents For complete detail about setting the Limit Current see Chapter 2 Separate positive and negative current limits are available LIM POSITIVE and
7. gain value will be smaller than if a lower sensitivity sensor were installed into the same thermal load Correspondingly the integrator time constant increases when using highly sensitive temperature sensors and the differentiator time constant decreases Thermistors are temperature sensors that exhibit high sensitivity and therefore require less proportional gain for optimum performance Unfortunately thermistors only perform well over a limited temperature range and their sensor sensitivity is non linear This means that thermal loads using thermistors are optimally tuned around one temperature but performance degrades as the setpoint temperature is moved away from the initial tuning temperature The LFI 3751 compensates for a thermistor s non linear sensitivity in temperature mode by recalculating the optimum P I and Dterms whenever the setpoint temperature is changed Linear sensors such as the Analog Devices AD590 and National Semiconductor LM335 and Platinum RTDs exhibit poor sensitivity and therefore require considerably higher proportional gains but do not require recalculation of the PID terms 5 Thermal load variation and Autotune Optimization Ideally we would measure the load s thermal lag time L the maximum temperature versus time slope R ax and the load s thermal time constant T for a given output step current TE I at any temperature and achieve the same results Unfortunately most thermal loads are only linea
8. l j l l i your system l l l l l l Your system responds by going towards the setpoint Chapter 2 Front Panel Operation Autotune PID Operation Autotune PID Operation The LFI 3751 is capable of automatically characterizing your thermoelectric or resistive heater load and calculating optimum control loop settings for P I and D 1 Autotune Process During an Autotune the LFI 3751 measures the load s thermal lag time L the maximum Temperature versus Time slope R nax and the load s thermal time constant T for a given output step current TE I The time to complete an Autotune Optimization varies from load to load The process occurs in three phases Phase 1 The LFI 3751 ramps the thermoelectric current to drive the thermal load temperature toward the setpoint temperature Phase 2 The LFI 3751 performs three characterization passes Phase 3 The LFI 3751 reverts to normal operation saving the optimized P I and D settings in non volatile memory and settling in at the setpoint temperature Setpoint Ambient Phase 1 Phase 2 23 Chapter 2 Front Panel Operation Autotune PID Operation 2 Preliminary Considerations Before performing an Autotune certain parameters must be set Here are five items to consider before you start an Autotune sequence A Current Limit Setting Make sure the LIM setting does not exceed the maximum TE rating for your thermoelectric In Phase 1 o
9. 0 00 to 5 00 Amps POSITIVE 3 700 AMPS Thermistors or RTDs T R data AD590 LM335 5 00 to 0 00 Amps B1 Slope NEGATIVE en C B1 only C00 AMPS Aak oo kQ AUX T 8 00 C to 150 00 C Sm C typical Thermistors or RTDs T R data AD590 LM335 c1 Offset ae KC C1 only C2 537 Default Sensor Configuration A1 A2 B1 B2 C1 C2 Thermistor 10 C 19 9 KQ 25 C 10 kQ 5 326 kQ RTD 1 1 0 C 0 100 KQ 0 139 KQ AD590 2 2 1uA K z LM335 3 3 10 mV K Rear Panel at a Glance Analog Input RS 232 Output BNC Connector Connector 25 pin male Output D sub plu Connector om 9 pin male INPUT D sub plug OUTPUT RS 232 OUTPUT lt __ EE Ea Q VOODOOOOOOOO RS 232 Input RS 232 INPUT Serial ik Connector Number COCO S E 25 pin female D sub receptacle Fan Vent Holes OCCO Do Not Block or place SSSSS any objects within 6 of O cme SSSSS the rear panel of this instrument Risk of Electrical Shock SSSS 2 Soy A ammon ANN ig a SS8y ewer 2 Sig SSS eni tee BA SSSSY Earth Ground o Yes PAY E creel Gy 00000 amp PERN a ae Entry Module 1000 maT 230V connect earth ground 5x20mm SLO BLO k via a 16 AWG wire to ees m m provided Ensure that the power source you plug this screw terminal gt the LFI 3751 into is properly grounded LINE Ag SELECT 115 230 VAC 50 60 Hz 160 VA Wavelength E
10. 2 0 generated since counter was last cleared Char 1 0 DIGI POT has 32 interrupts per rotation Char 0 0 Chapter 4 Remote Interface Reference End Code Listing End Code Listing Normal Ending No errors Command Type not supported Valid values are 1 or 2 Illegal ASCII digit contained in Command Code or FCS field Data field Char 7 must be or Data field Char 3 must be Data field Char 6 5 4 2 1 or O contains an illegal ASCII character not 0 to 9 Command Type not supported for Command Code for example executing an ACT T measurement with 2 WRITE as Command Type PASSWORD protected data no PASSWORD issued prior to command execution Command Code not implemented FCS does not match computed FCS for this Command Packet Parser programming error Please contact factory Write command requires 1 or 0 in one of the data characters Invalid ASCII value found Query Calculation Error Instrument unable to calculate requested measurement Data returned is 999 999 Sensor Configuration data written while Output is on Sensor Data unchanged RS 232 Lamp Control Write Error Data characters not valid One test state allowed per write Ignoring the decimal point data must translate to a binary value of 0 1 2 4 8 16 or 32 87 88 This page intentionally left blank Chapter 4 Remote Interface Reference Starting RS 232 Communication with the LFI 3
11. 232 Address e Press and hold the Shift Button After three seconds the RS 232 address will be displayed The REMOTE RS 232 LED will light solid to indicate the address is displayed and can be adjusted e Continue to hold the Shift Button and rotate the Digi Pot Adjust Knob to change the value from 1 to 99 e Release the Shift Button to save the displayed RS 232 address e The RS 232 address can only be changed via the front panel Resistive Heater Chapter 2 Front Panel Operation Operating with Resistive Heaters Operating with Resistive Heaters Resistive Heater operation is similar to operation with thermoelectrics except only heating current is delivered to a resistive heater e The LFI 3751 can be configured to deliver only heating current by adjusting the Positive Current Limit to 0 00 Amps e Since the LFI 3751 has a limited output voltage of 8 Volts at 5 Amps select a low value resistive heater to use the maximum power from the LFI 3751 67 68 This page intentionally left blank Chapter 3 Rear Panel Operation 69 70 Chapter 3 Rear Panel Operation Rear Panel Operation This chapter details the sections of the rear panel and provides pinouts for all connectors Output Connector 9 pin male D sub plug TEC TEC Aux Sensor Sensor Main Sensor AD590 Voltage Fan Fan 12 V 12 V 7 2 3 4 5 6 T 8 o Thermally Fused to 100 mA Example Therm
12. Connector on the rear panel of the first unit to the RS 232 Input Connector on the rear panel of the second and so on daisy chain configuration The temperature controller is not configured as a DTE Data Terminal Equipment device If your serial port is configured as a DTE device you do not need a null modem to communicate with the LFI 3751 The LFI 3751 uses software XON XOFF flow control 1 RS 232 Configuration Overview e Communication conforms to the RS 232C interface specifications e Up to 99 temperature controllers can be connected to each RS 232 port on the host computer e Cable length should not exceed 15 meters between computer and LFI 3751 or between two LFI 3751s e Use shielded twisted pair cables AWG 28 minimum e The communications specifications of the LFI 3751 are fixed Set the host computer to match the specifications listed below Parameter Setting RS 232 Baud Rate 192 Kbps Communication Bit Length 8 Bit Settings Parity No Parity Stop Bit 1 Stop Bit 77 Chapter 4 Remote Interface Reference RS 232 Interface Configuration 1 Connections to a Computer e Pins 5 6 8 and 20 on the LFI 3751 RS 232 Input Connector are shorted at the connector to ensure that the computer serial port is properly configured to transmit and receive data Pin 4 on the 9 pin D Sub male plug Data Terminal Ready Out provides the appropriate handshaking to the computer s Data Carrier Detect In pin 1 Data Set Ready
13. RTD is properly entering the configuration data An RTD s temperature response can be assumed to be linear or more precisely modeled by the Callendar Van Dusen Curve fit To indicate that the sensor is an RTD A 1 000 1 000 To calculate the linear or Callendar Van Dusen coeffcients the LFI 3751 requires two data pairs B T R C T R With the appropriate equation and coefficients the LFI 3751 can calculate temperature from RTD resistance and properly calculate the setpoint resistance from the setpoint temperature 1 Wiring an RTD Wire the RTD to the Output Connector on the rear panel Shielded cables are available Wavelength part number CAT 220 Do not exceed 1 meter cable length Refer to Sensor Error Condition on page 55 if you can t clear a Sensor Error 2 Automatic Bias Current A fixed bias current flows from pin 5 through the RTD and back into pin 4 to produce a voltage V As the RTD resistance R changes the voltage changes The voltage must be between 0 and 5 V for proper operation The LFl 3751 automatically ranges between four bias currents 10 uA 100 uA 1 mA and 10 mA to optimize the feedback while allowing a wider temperature range of operation Hysteresis is designed in to produce bumpless operation when switching from one bias current to another Bias Current and Sensor Resistance Sensor Current Resistance Range 10 pA 25kQ to 500 kQ 100 LA 2 5kQ to 45kQ 1mA 0 25k
14. RTD Resistance at 0 C Rarp Resistance of RTD Tarp Temperature of RTD alpha Normalized AR vs Temperature A 40 Chapter 2 Front Panel Operation Controlling Temperature with RTDs Callendar Van Dusen Curve Fit RTD Configuration Callendar Van Dusen Curve Fit For more accuracy the RTD response can be approximated by the Callendar Van Dusen curve fit Most platinum RTDs R R 1 B T B T B T 100 follow one of three standardized curves the DIN 43760 standard the U S Industrial or American standard or the R RTD Resistance at 0 C International Temperature Scale that is used with wire wound R Resistance of RTD RTDs The following table lists the coefficients for these T Temperature of RTD three platinum RTDs B Ba B Callendar Van Dusen coefficients Callendar Van Dusen Coefficients standard Ahe DIN 43760 0 003850 3 908 x 10 5 8019 x 107 4 2735 x 10 American 0 003911 3 9692 x 10 5 8495 x 10 4 2325 x 10 ITS 90 0 003926 3 9848 x 10 5 87 x 107 4 0 x 107 To use these coefficients rather than the linear configuration certain values must be entered for B and C The LFI 3751 will use the Callendar Van Dusen coefficients if T 0 C T 100 C and R R is listed in the table above The following table shows what should be entered for a 100 Q RTD that follows each of the standardized curves Example Entries for three different standard 100 Q
15. RTDs S B_J o O Standard T or B1 R or B2 T or C1 R or C2 DIN 43760 0 C 0 100 kQ 100 C 0 139 kQ American 0 C 0 100 kQ 100 C 0 140 kQ ITS 90 0G 0 100 kQ 100 C 0 141 KQ Calculate Temperature from Resistance Temperature will be calculated using the first two coefficients Callendar Van Dusen Curve Fit B amp B Coefficient B is not used but its absence does not introduce considerable error T B R V B R 4B R R Rar 2 By R R RTD Resistance at 0 C Rarp Resistance of RTD T Temperature of RTD 41 Chapter 2 Front Panel Operation Controlling Temperature with RTDs decrease Adjust A Increase decrease Adjust B Enter T B1 Entering Data Pair A Rotate the Display Select Switch to A Shift Button ON The first two data pairs alternate on the display 1 000 1 000 indicates to the LFI 3751 that you re using an RTD Rotate the Digi Pot Adjust Knob to change the value displayed A B and C cannot be adjusted while the output is on Data pairs A B and C are saved in non volatile memory RS 232 Command A1 001 000 A2 001 000 5 Entering Data Pair B e Rotate the Display Select Switch to B Shift Button ON to display the second data pair e Rotate the Digi Pot Adjust Knob to adjust each value as it is displayed Default from the factory sets up for a 100 Q RTD using the DIN 43760 coefficient
16. SENSOR ERROR CONDITION CORRECTED NO YES X 7 LONG y 3 BEEP NE cee e PRESS OUTPUT BUTTON IS SENSOR ERROR CONDITION CORRECTED OUTPUT wo Press Output Button to lO re enable output current Sensor Error LED flashes when sensor is shorted or open One long beep sounds if error has not been corrected after pressing the Output Button The Sensor Error LED flashes red and the unit beeps whenever the sensor error condition occurs The output is forced OFF If you correct the error condition then press the Output Button to clear the error the instrument will beep three times to indicate that the error is cleared Once the error is cleared press the Output Button to re enable the current If the error condition has not been corrected when you press the Output Button to clear the error the instrument will sound one long beep As long as the error condition has not been corrected pressing the Output Button will produce the long beep If the error condition is corrected when you press the Output Button the unit will beep three times to indicate the error has been cleared Press the Output Button again to turn on the output current The sensor error condition is triggered by a sensor signal that is either too high or too low a voltage The table below indicates where each sensor will trigger a sensor error Low Sensor High Sensor SENSOR Error Condition Error Condition Thermistor RTD AD590 LM
17. SET R ACTT SETT TEI TEV LMI AUXT bE GEE O Default AD590 Configuration A 2 000 A1 2 000 A2 B Slope 1 000uA K B1 C Offset 0 00 uA C1 Bottom View AD590 TO 52 package Bottom View AD592 TO 92 package AD590 Temperature l b AD590 AD590 T n 273 15 AD590 T AD590 Temperature C loso AD590 Current Mapsoo AD590 Slope b AD590 Offset ADS590 Chapter 2 Front Panel Operation Controlling Temperature with an AD590 Controlling Temperature with an AD590 Key to accurately measuring and controlling temperature with an AD590 is properly entering the configuration data An AD590 is a current source with an output current that varies linearly with temperature To indicate to the LFI 3751 that the sensor is an AD590 A 2 000 2 000 To characterize the linear response the LFI 3751 requires a Slope and Offset For the AD590 B Slope and C Offset With this information the LFl 3751 can calculate temperature from AD590 current and properly calculate the setpoint current from the setpoint temperature 1 Wiring an AD590 Wire the AD590 to the Output Connector on the rear panel Shielded cables are available Wavelength part number CAT 220 Do not exceed 1 meter cable length Refer to Sensor Error Condition on page 55 if you can t clear a Sensor Error 2 Temperature vs AD590 Current An AD590 is a current source with an output current that varies
18. Specifications Mechanical Specifications Mechanical Specifications 12 00 305mm o 6 50 165mm 12 65 321mm Appendix CAT 220 Cable Accessory Diagram 131 Appendix CAT 220 Cable Accessory Diagram CAT 220 Cable Accessory Diagram ee Description Wire color TEC RED TEC BLACK Aux Sensor BROWN Sensor GREEN CAT 220 fd hH a Main Sensor WHITE AD590 Voltage ORANGE Fan YELLOW Fan 12 V BLUE 12V PURPLE SLATE OAOnNouahkWNDM o 132
19. T C1 e Rotate the Display Select Switch to C Shift Button ON to display the third data pair e Rotate the Digi Pot Adjust Knob to adjust each value as it is displayed e A B and C cannot be adjusted while the output is on e Data pairs A B and C are saved in non volatile memory e RS 232 Command C1 T C2 R Display Resolution Temperature 199 9 20 0 C 19 99 2 00 C 1 999 9 999 C 10 00 99 99 C 100 0 199 9 C Resistance 9 999 kQ 99 99 kQ 499 9 kQ Chapter 2 Front Panel Operation Controlling Temperature with Thermistors Display Actua 7 Displaying Actual Thermistor Temperature Thermistor Temperature e Rotate the Display Select Switch to ACT T Shift Button OFF to display the thermistor temperature Display Resolution e RS 232 Command ACT T 20 0 C 2 00 C 9 999 C 99 99 C 199 9 C Display Actual i H Thermistor Pesisiahce 8 Displaying Actual Thermistor Resistance e Enter 0 000 0 000 for A to have the LFI 3751 display thermistor resistance kQ when the Display Select Switch is rotated to ACT T Shift Button OFF Display Resolution e RS 232 Command ACT R 0 to 9 999 kQ 10 00 to 99 99 kQ 100 0 to 499 9 kQ Display Setpoint Temperature 9 Adjusting Thermistor Temperature Setpoint decrease N e Rotate the Display Select Switch to SET T Shift Button OFF i Temperature will be displayed 9 mere To adjust the setpoint rotate the D
20. Used Char 5 Not Used Char 4 Not Used Char 3 Decimal Point Char 2 Analog Input Gain 3 100 1 0 OFF 1 ON Char 1 Analog Input Gain 2 10 1 0 OFF 1 ON Char 0 Analog Input Gain 1 1 1 0 OFF 1 ON e When writing the MOD Gain Configuration command Character 7 or configures the instrument to manual or automatic mode A puts the Analog Input Gain under manual control A lets the instrument automatically change the gains When Character 7 is Characters 6 through O are ignored when writing When the gain is controlled automatically the transfer function changes with sensor andi bias Analog Input Transfer Functions Thermistors amp RTDs 10 uA or 100 uA 10kQ V Thermistors amp RTDs 1 mA or 10 mA 100 Q V LM335 35 AD590 10 C V e To read the MOD Gain Configuration the Command Type changes from a WRITE 2 to a READ 1 Read 1101142 000 00023 Reads MOD Gain Configuration _ 104 RS 232 Commands Discussed Alarm Status Chapter 4 Remote Interface Reference Checking the Alarm Status Checking the Alarm Status To monitor the status of the Sensor Error Temperature Limits Current Limits and Output Current use the Alarm Status command To read the Alarm Status of the instrument send the following Command Packet Read 1101135 000 00023 Reads Alarm Status The following table details the structure of the character
21. below the thermoelectric s maximum current Assume the example thermoelectric s maximum current is 1 25 Amps Set the Limit Current to 1 0 Amps Rotate the Display Select Switch to LIM with the Shift Button OFF The positive and negative limits will alternate on the display Rotate the Digi Pot Adjust Knob until 1 00 and 1 00 alternate 4 Set Temperature Limit Press and release the TEMP LIMIT Button Two numbers will alternate on the display If the thermistor temperature exceeds these limits the output current will be turned off The numbers will alternate three times before the display reverts to the parameter selected by the Display Select Switch in this case LIM I Assume that the load should not be allowed to freeze 0 C and should not exceed 55 C Rotate the Digi Pot Adjust Knob until 0 C and 55 C are displayed The highest temperature is selected as the High T LIMIT and the lowest temperature is used as the Low T LIMIT 5 Display and Adjust Setpoint Temperature Rotate the Display Select Switch to SET T and toggle the Shift Button OFF The setpoint temperature is displayed Rotate the Digi Pot Adjust Knob until 25 C is displayed Chapter 1 Quick Start Nine Steps to Operating the LFI 3751 Begin Autotune Optimization Autotune Rotate the Display Select Switch to P and toggle the Shift Button ON Use the Digi Pot Adjust Knob to change the value To begin Autotune optimization adjust the P value to display Au
22. cables are available Wavelength part number CAT 220 Do not exceed 1 meter cable length Select your sensor and refer to the appropriate section on Controlling Temperature with that sensor Adjusting Current and Temperature Limits Do not enable current until all the Current Limits Temperature Limits and Setpoint are adjusted for your application See page 56 for Current Limits 57 for Temperature Limits and 60 for Setpoint Enabling Output Current Press the Output Button to enable current flow through the thermoelectric or resistive heater The Output LED will light solid green Expect the actual temperature to change in the direction of the setpoint and then stabilize RS 232 Command RUN STOP Disabling Output Current Press the Output Button to disable current flow through the thermoelectric or resistive heater The Output LED turns OFF RS 232 Command RUN STOP Clearing Error Conditions If the Temperature Limits are exceeded or a Sensor Error occurs the T LIMIT LED or SENSOR LED will flash red and the output will turn off Once the error condition is corrected press the Output Button to clear the error If successfully cleared you will hear three beeps Press the Output Button again to re enable the output current If the error condition was not corrected you ll hear one long beep Pressing the Output Button then will produce the long beep until you clear the error Once the error is cleared press
23. distributor you purchased the unit from Chapter 1 Quick Start Nine Steps to Operating the LFI 3751 Nine Steps to Operating the LFI 3751 These nine basic steps will familiarize you with the LFI 3751 temperature controller This example controls a thermoelectric load to 25 C using a 10 kQ thermistor Complete details are included in later chapters Thermoelectric 1 Wire Output Connector 1 Amp 3 Volt Output Connector 3 9 pin Dub plug male This 9 pin D Sub male plug requires a mating female PINOUT receptacle Wire the thermoelectric module to pins 1 TEC positive lead and 2 negative lead Wire the sensor TEC a thermistor in this example to pins 4 amp 5 The Aux Sensor remaining hookups are optional If you need a fan to Sensor z eae cool a heatsink wire a 12 V fan 100 mA maximum AD590 Voltage to pins 8 amp 7 If you need a second sensor to monitor Fan an auxiliary zone ambient heatsink wire a 10 kQ Make sure all connections are solid Thermistor Wavelength TCS 610 Fan 12V thermistor to pins 3 amp 4 Install the 50 Q BNC terminator 12V on the Analog Input BNC on the rear panel Thermally Fused to 100 mA 2 Configure Sensor Steinhart Hart Thermistor The change in resistance vs temperature of a thermistor can be modeled Equation by the Steinhart Hart Thermistor equation The LFI 3751 calculates the 1 three coefficients X X amp X from three
24. has been processed correctly and Response Packet contains valid data Data is not valid if any other End Code is returned 01 Command Type Not Supported Fifth character of the Command Packet Command Type contains a character other than 1 or 2 Only 1 Read and 2 Write are supported Command Types 02 Illegal ASCII Digit The Command Code or FCS fields contain an illegal ASCII digit The Command Code can accept 00 through 99 FCS is a HEX number so can accept 00 through FP 03 Invalid Data Character 7 This character must contain either or 04 Invalid Data Character 3 This character must contain a decimal point 05 Invalid ASCII Data Character Digit Characters 6 5 4 2 1 or O must contain a valid ASCII digit 0 through 9 20 Command Code does not support CommandType Certain Command Codes can only read data and other Command Codes can only write data Some do both For example measurement codes are read only commands If you send an ACT T code with a 2 in the fifth character Command Type WRITE the Response Packet will return with this End Code oo 121 Chapter 4 Remote Interface Reference End Code Reference 21 PASSWORD Required The Command Packet attempts to write password protected data The PASSWORD command must be issued first 22 Command Number Not Implemented The Command Packet uses a Comma
25. send the following Command Packet Write 1101291 000 1002F Turns on Unit of Measure amp Shift LEDs e Once the Command Packet is executed the test state will be repeated until the instrument is returned to normal operation e To return the instrument to normal operation either turn off the power or send a Command Packet with a in Character 7 118 Chapter 4 Remote Interface Reference Diagnostic Switch Status Diagnostic Switch Status RS 232 Output Shift and Temp Limit Pushbutton Status Commands Discussed e The following table details the structure of the characters in the data field PUSHBUTTON SWITCH for the PUSHBUTTON SWITCH STATUS command STATUS ROTARY SWITCH STATUS Char 7 Sign Char Not Used Char 6 Not Used Char 5 Not Used Char 4 Not Used Char 3 Decimal Point Char 2 Temp Limit Pushbutton 0 OFF 1 ON Char 1 Shift Pushbutton 0 OFF 1 Lamp ON Char 0 Output Pushbutton 0 OFF 1 Lamp ON e To read the current status of the pushbutton switches send the following Command Packet Read 1101192 000 0002E Reads Pushbutton Switch Status Rotary Switch Status e The following table details the structure of the characters in the data field for the ROTARY SWITCH STATUS command A 1 indicates the position of the rotary switch Char 7 Sign Char Not Used Char 6 AUX T C Char5 LIM1 B Char4 TEV A Char 3 Decimal Point Char 2 TEI D Char 1 S
26. the control loop method If you are in an electrically noisy environment don t use the D term Use only the P amp I terms Generally it is best to choose PID control and let the LFI 3751 determine your control loop method For slow thermal loads that cycle around the setpoint even after PI or PID Autotune select P or PD for the control loop Note P or PD control loops will not settle the load temperature at SET T and will also result in setpoint inaccuracy 24 Before Setpoint Response Autotune Temp After Setpoint Response Autotune gt Time Before Disturbance Rejection Autotune Before Autotune Temp After Disturbance Rejection Autotune NY After Autotune Time Starts in opposite direction because of right hand zero Chapter 2 Front Panel Operation Autotune PID Operation 3 Choose an Autotune method There are two Autotune optimization selections available Setpoint Response Tuning and Disturbance Rejection Tuning Setpoint Response Tuning is valuable when continuously stepping the LFI 3751 from one temperature to another Your system will go to temperature quickly and settle in with little or no overshoot Disturbance Rejection Tuning is valuable when your thermal load is exposed to varied environmental conditions such as air currents or ambient temperature fluctuations It also improves temperature stability in applications where the device being temperature controlled e
27. the instrument s Model Number send the following Command Packet Read 1101157 000 00027 Reads Model Number XXXXXXXX should return LFI 3751 109 RS 232 Commands Discussed PASSWORD 10 pA BIAS CAL 100 pA BIAS CAL 1 mA BIAS CAL 110 Chapter 4 Remote Interface Reference Calibration Sensor Bias Current and AD590 Sense Resistance Calibration Sensor Bias Current and AD590 Sense Resistance e All sensor bias currents and the AD590 sense resistance are calibrated at the factory To change these calibrated values you must first send the PASSWORD command You should not use these commands without direct supervision from Wavelength Electronics Technical Support Group Write Calibrating the 10 uA Reference Current e If the instrument s 10 uA reference current is actually 9 89 uA send the following Command Packet to properly calibrate the unit Write 1101261 009 89029 10uA BIAS CAL in uA Calibrating the 100 uA Reference Current e Ifthe instrument s 100 uA reference current is actually 99 5 uA send the following Command Packet to properly calibrate the unit Write 1101262 099 50027 100 uA BIAS CAL in uA Calibrating the 1 mA Reference Current e If the instrument s 1 mA reference current is actually 1 005 mA send the following Command Packet to properly calibrate the unit Write 1101263 001 00527 1 mA BIAS CAL in mA Chapter 4 Remote Interface Reference Calibrati
28. use these commands without direct supervision from POS SETT SLOPE CAL Wavelength Electronics Technical Support Group POS SETT OFFSET CAL Write NEG SETT SLOPE CAL NEG SETT OFFSET CAL 1101254272222222 FCS PASSWORD Calibrating Positive SET T Slope amp Offset e These commands calibrate the positive voltage SET T setpoints Write 1101280 001 0002F POS SET T SLOPE CAL 1101281 000 0002F POS SET T OFFSET CAL in Volts Calibrating Negative SET T Slope amp Offset e These commands calibrate the negative voltage SET T setpoints Write 11012824 001 0002D INEG SET T SLOPE CAL 1101283 000 0002D NEG SET T OFFSET CAL in Volts Reading the Current Calibration Settings e Toread the current calibration settings the Command Type changes from a WRITE 2 to a READ 1 and no PASSWORD is required Read 1101180 000 0002D Reads POS SET T SLOPE CAL 1101181 000 0002C Reads POS SET T OFFSET CAL in Volts 1101182 000 0002F Reads NEG SETT SLOPE CAL 1101183 000 0002E Reads NEG SETT OFFSET CAL in Volts 115 RS 232 Commands Discussed PASSWORD T POS LIM I SLOPE CAL T POS LIM OFFSET CAL T NEG LIM I SLOPE CAL T NEG LIM I OFFSET CAL Chapter 4 Remote Interface Reference Calibration TE Limit Current Slopes amp Offsets Calibration TE Limit Current Slopes amp Offsets e The TE Limit Current values are calibrated at the factory To change these calibrated values you must fi
29. 1025 INPUT TYPE 1026 PRINT Enter command code 1027 INPUT CODE 1028 IF TYPE 1 THEN DATA 000 000 1029 ELSE PRINT Enter data i e xxx xxx INPUT DATA 1030 COMMAND 1 ADDRESS TYPE CODE DATA 1031 Chapter 4 Remote Interface Reference Example BASIC Control Program for IBM PC Compatible Machines 1032 Calculate the Frame Check Sum FCS for the entered command 1033 1034 FCS 0 1035 FOR IFCS 1 TO LEN COMMAND 1036 FCS FCS XOR ASC MID COMMAND IFCS 1 1037 NEXT 1038 FSC RIGHT 0 HEX FCS 2 1039 1040 Issue command packet to the instrument 1041 1042 PRINT 1 COMMAND FCS 1043 1044 Receive the response packet back from the instrument 1045 1046 RCNT 0 1047 RECV 1048 RLOOP 1049 1050 If the COM port buffer contains data then process data in RDATA loop otherwise 1051 keep track of time gone by since data has been entered into COM port buffer 1052 1053 IF LOC 1 lt gt 0 THEN RDATA 1054 RCNT RCNT 1 1055 1056 If no data has been entered into the COM port buffer by the time the counter RCNT 1057 reaches 100000 then indicate the instrument is not responding If you receive the 1058 No Response error too frequently then increase the error count value 1059 1060 IF RCNT 100000 THEN RERROR 1061 ELSE RLOOP 1062 125 126 Chapter 4 Remote Interface Reference Example BASIC
30. 335 LM35 _ _ 55 ACTT SETT m TEI TEV LMI AUXT Default Limit Currents Positive LIMI 1 00 Amp BOE Gee LIM I POSITIVE Negative LIM 1 00 Amp LIM NEGATIVE Display Limit Currents Positive LIM I LIM I LED flashes when Positive or Negative Limit is reached LIMIT I N17 LIN Chapter 2 Front Panel Operation Setting Limit Currents Setting Limit Currents To protect the thermoelectric or resistive heater positive and negative limit currents can be set below the damage threshold Rotate the Display Select Switch to LIM I Shift Button OFF Current in Amps will be displayed The positive limit will alternate with the negative limit Rotating the Digi Pot Adjust Knob clockwise makes the Positive LIM I more positive Rotating the Digi Pot Adjust Knob counter clockwise makes the Negative LIM I more negative To operate a Resistive Heater set the Positive Limit to 0 00 Amps The limit settings will not be updated until the Digi Pot stops moving When the output is current limited TE I will be within 50 mA of the limit setting LIM I settings are saved in non volatile memory When the setpoint and actual temperature are different the LFI 3751 drives current to the thermoelectric or resistive heater until the load approaches the setpoint temperature Sometimes the output current is driven up to the limit current settings indicated by the LIM I LED flashi
31. 3751 display RTD resistance kQ when the Display Select Switch is rotated to ACT T Shift Button OFF e RS 232 Command ACT R Display Resolution 0 to 9 999 kQ 10 00 to 99 99 kQ 100 0 to 499 9 kQ Chapter 2 Front Panel Operation Controlling Temperature with RTDs Adjusting RTD 9 Temperature Setpoint a e increase e Adjusting RTD Temperature Setpoint Rotate the Display Select Switch to SET T Shift Button OFF Temperature will be displayed To adjust the setpoint rotate the Digi Pot Adjust Knob While the knob is rotating the display will change but the instrument will not control to the new setpoint until the knob stops moving The decimal point will move to display maximum resolution SETT is saved in non volatile memory RS 232 Command SETT Adjusting RTD 10 Adjusting RTD Resistance Setpoint Resistance Setpoint iecrease e E increase 44 Rotate the Display Select Switch to SET T Shift Button OFF If 1 000 1 000 has been entered for A and 0 000 0 000 has been entered for B resistance will be displayed To adjust the setpoint rotate the Digi Pot Adjust Knob While the knob is rotating the display will change but the instrument will not control to the new setpoint until the knob stops moving The decimal point will move to display maximum resolution SET R is saved in non volatile memory Temperature Limits are disabled in Resistive Operating Mode RS 232 Command
32. 499 900 kQ Temperature 2 199 900 to 199 900 C Resistance 2 000 000 to 499 900 kQ Temperature 3 199 900 to 199 900 C Resistance 3 000 000 to 499 900 kQ RTD Sensor Type 001 000 Sensor Type 001 000 Temperature 1 199 900 to 199 900 C Resistance 1 000 000 to 499 900 kQ Temperature 2 199 900 to 199 900 C Resistance 2 000 000 to 499 900 kQ AD590 Slope 000 100 to 009 999 uA K Offset 009 990 to 009 990 uA LM335 Sensor Type 003 000 Sensor Type 003 000 Slope 001 000 to 020 000 mV K Offset 009 990 to 009 990 mV Sensor Type 004 000 Sensor Type 004 000 Slope 001 000 to 020 000 mV C Offset 009 990 to 009 990 mV e Sensor Data A1 A2 B1 B2 C1 or C2 cannot be changed while the Output is ON Sensor Type 002 000 Sensor Type 002 000 21 22 23 24 25 26 21 22 23 24 25 26 21 22 23 25 21 22 23 25 21 22 23 25 91 RS 232 Commands Discussed Sensor Bias Configuration Chapter 4 Remote Interface Reference Configuring the Sensor 2 Selecting Automatic or Manual Sensor Bias e Each sensor type needs a different bias The following table details the typical settings for each type of sensor See Chapter 2 for a thorough discussion of each sensor type Typical Sensor Settings NTC or PTC Sensor Type Sensor Typical Bias Current or Sense Resistance Thermistor 10 uA or 100 pA RTD 1mA or 10 mA AD590 10 kQ resistor across output LM335 1mA LM35 10 kQ resisto
33. 751 Starting RS 232 Communication withthe LFI 3751 Once you have connected a computer and at least one LFI 3751 set the units RS 232 address from the front panel Display RS 232 Address 1 Set RS 232 address decrease E increase e Press and hold the Shift Button After three seconds the RS 232 address will be displayed e The REMOTE RS 232 LED will light solid to indicate the address is displayed and can be adjusted e Continue to hold the Shift Button and rotate the Digi Pot Adjust Knob to change the value from 1 to 99 Hold in for 3 seconds e Release the Shift Button to save the displayed RS 232 address Release the SHIFT Button to save the displayed e The RS 232 address can only be changed via the front panel RS 232 address 2 Send a Command Packet Then simply send a Command Packet to that instrument s address e The REMOTE RS 232 LED will flash to indicate communication is occuring The LED will light solid if the unit has not reverted to LOCAL mode and no communication with the host computer is ongoing The following sections detail how to operate the LFI 3751 via RS 232 communication ee 89 RS 232 Commands Discussed A1 A2 B1 B2 C1 C2 Chapter 4 Remote Interface Reference Configuring the Sensor Configuring the Sensor For complete detail about sensor configuration see Chapter 2 1 Characterizing Temperature Response Four or six parameters m
34. 99 from host computer 72 Analog Input BNC Chapter 3 Rear Panel Operation BNC Connector BNC Connector Used with Analog Version only Analog Input BNC Input a 0 to 10 V analog signal to adjust the setpoint remotely The sum of the front panel SET T setting and analog input determine the control temperature If not using the analog input install the 50 Q BNC terminator provided with the unit to minimize electrical noise and protect against electro static discharge The transfer functions change according to the sensor type and bias current Analog Input Transfer Functions Thermistors amp RTDs 10 uA or 100 uA 10kQ V Thermistors amp RTDs 1 mA or 10 mA 100 Q V LM335 35 AD590 Thermocouples 10 C V e Example With a thermistor biased with 100 uA if SET R is 12 KQ if you input 0 2 V at the Analog Input BNC the setpoint becomes 12 KQ 0 2 V 10 kQ V 14 KQ e RS 232 Command MOD Gain Configuration 73 LINE 115 230 VAC 50 60 Hz 160 VA 115V OS SELECT AMI FUSE 250V 2000 maT 115V 1000 maT 230V 5x20mm SLO BLO Q Chapter 3 Rear Panel Operation AC Power AC Power 1 AC Power Entry Module The AC Power Entry Module on the rear panel is designed to accept input voltages from 98 to 133 and 196 to 265 VAC Ensure that the power source you plug the temperature controller into is properly grounded 2 AC Voltage Select Switch The Voltage Select Switch configures
35. A1 3 000 A2 B Slope 10 00 mV K B1 C Offset 0 0 mV C1 LM335 TO 46 Bottom View metal can package Bottom to pin 5 View GE to pin 4 TO 92 plastic package LM335 Temperature Vv b T 5 B Se Lwe 273 15 M M335 T LM335 Temperature C Vi mass Voltage across pins 4 amp 5 M yags LM335 Slope 10 mV Kelvin b LM335 Offset 0 mV LM335 Chapter 2 Front Panel Operation Controlling Temperature with an LM335 Controlling Temperature with an LM335 Key to accurately measuring and controlling temperature with an LM335 is properly entering the configuration data An LM335 produces a voltage that changes linearly with temperature To indicate to the LFI 3751 that the sensor is an LM335 A 3 000 3 000 To characterize the linear response the LFI 3751 requires a Slope and Offset For the LM335 B Slope and C Offset With this information the LFI 3751 can calculate temperature from LM335 voltage and properly calculate the setpoint voltage from the setpoint temperature 1 Wiring an LM335 Wire the LM335 to the Output Connector on the rear panel Shielded cables are available Wavelength part number CAT 220 Do not exceed 1 meter cable length Refer to Sensor Error Condition on page 55 if you can t clear a Sensor Error 2 Temperature vs LM335 Voltage The LM335 produces a voltage that changes linearly with temperature in Kelvin The LFI 3751 requires a Slope and Of
36. Command and Response Packet Formats RS 232 Command and Response Packet Formats e The host computer sends a Command Packet to the instrument and the temperature controller returns a Reponse Packet to the host computer A Response Packet always returns after each Command Packet is sent The HALT PROCESSOR command is the only exception The processor is immediately halted and does not return a Reponse Packet e All characters in the Command and Response Packets are ASCII The character fields are decimal 0 to 9 except for the Frame Check Sum FCS which is represented in HEX 0 to 9 or A to F e The characters within the packets follow a rigid structure The instrument s parser expects 17 characters in a Command Packet Extra Command Packet characters will be ignored until a new start character is received A Response Packet always contains 21 characters e READ commands Command Type 1 do not use the data field The data field must still contain a number between 999 999 and 999 999 e There are no restrictions on how fast the host computer sends characters to the instrument The packets can be sent at one character per second or using the full 19200 baud capacity If the host computer can t buffer the instruments Response Packets at full speed configure the host computer s RS 232 port for XON XOFF flow control e When a value is written to the instrument in a Command Packet the corresponding R
37. Control Program for IBM PC Compatible Machines 1063 The following loop sums the COM port buffer to create a response packet 1064 If 21 characters are detected in the COM port buffer then the response packet is 1065 printed to the screen 1066 1067 RDATA 1068 RECV RECV INPUT LOC 1 1 1069 IF LEN RECV 21 THEN REND 1070 ELSE RCNT 0 GOTO RLOOP 1071 1072 No response packet received 1073 1074 RERROR 1075 RECV No Response 1076 1077 Print the response packet 1078 1079 PRINT Instrument s response packet is RECV 1080 1081 Send another packet or end program 1082 1083 PRINT Continue Y or N 1084 INPUT C 1085 IF C Y THEN RS232LOOP 1086 CLOSE 1 1087 END Chapter 5 Specifications 127 128 Chapter 5 Specifications Specifications This chapter details the General Electrical and Mechanical Specifications of the LFI 3751 Temperature Controller Chapter 5 Specifications General and Electrical Specifications Power Supply Power Line Frequency Power Consumption Operating Environment Storage Environment State Storage Dimensions Bench Top Weight General Specifications 115 230 15 VAC Switch Selectable 60 50 Hz 160 VA peak 25 Watt average Output Off 55 Watt average Output On 0 to 55 C 80 Relative Humidity to 30 C 40 C to 70 C Power OF
38. Copy either Command or Response into Packet 1120 Run FCS Generator routine FCSGEN 1130 For Command Packets the routine generates the proper FCS 1140 For Response Packets the routine compares the FCS received to 1150 a calculated FCS and returns the FCSVALID flag 1160 FCSGEN 1170 FCS 0 1180 FCSVALID TRUE 1190 Input Packet 1200 STARTCHAR MID Packet 1 1 1210 IF STARTCHARS THEN FCSLEN LEN Packet 1220 IF STARTCHARS THEN FCSLEN LEN Packet 4 1230 IF STARTCHARS lt gt OR STARTCHAR lt gt THEN FCSVALID FALSE 1240 For IFCS 1 to FCSLEN 1250 FCS FCS XOR ASC MID Packet IFCS 1 1260 Next 1270 FCS RIGHT 0 HEX FCS 2 1280 IF STARTCHARS and FCS lt gt MID Packet 18 2 THEN FCSVALID FALSE e The following Visual C routine calculates the FCS for a Command or Response Packet static BYTE ComputeFCS const CString amp srPreFcsCmd BYTE ucFCS 0 zero FCS byte For debugging Validate CString object reference is to the first part of a Command or Response Packet ASSERT srPreFcsCmd GetAt 0 I srPreFcsCmd GetAt 0 ASSERT srPreFcsCmd GetLength 15 I srPreFcsCmd GetLength 17 Loop through each character of the string and Exclusive OR result with next character Byte returned should match transmitted FCS for BYTE ucCharldx 0 ucCharldx lt srPre
39. Discussed RUN STOP 1 Enable Current e To enable the instrument s output current send the following Command Packet Write 1101251 000 00123 Enable Output Current 2 Disable Current e To disable the instrument s output current send the following Command Packet Write 1101251 000 00022 Disable Output Current 3 Monitor Output Status e To read the output status the Command Type changes from a WRITE 2 to a READ 1 Read 1101751 000 00021 e The following table details the structure of the characters returned in the data field Char 7 Sign Char always Char 6 Not Used Char 5 Autotune Error Code 1 Zero Value Current Limit Error 2 Current Limit Cannot reach SET T 3 Non uniform TE step measured 4 Rate Sign Change Char 4 Autotune Status 0 Normal Operation 1 Autotune Operation Char 3 Decimal Point Char 2 Temp Limit or Sensor Error Status 1 requires clearing Char 1 Integrator Status 0 OFF 1 ON Char 0 Output Status 0 OFF 1 ON If Character 2 is 1 a Temp Limit or Sensor Error has occurred The next command to enable current will clear the error without enabling current SS eee 101 Chapter 4 Remote Interface Reference Measuring Thermoelectric Current and Voltage Measuring Thermoelectric Current and Voltage RS 232 Commands Discussed For complete detail about measuring thermoelectric current and voltage see Chapter 2 TE I TEV e
40. ETT I Char 0 ACTT P e To read the current status of the Rotary switch send the following Command Packet Read 1101193 000 0002F Reads Rotary Switch Status _ _ 119 Commands Discussed 120 RS 232 DIGIPOT STATUS Chapter 4 Remote Interface Reference Diagnostic Digi Pot Status Diagnostic Digi Pot Status The DIGIPOT STATUS command reads whether the Digi Pot is moving clockwise or counterclockwise and quantifies how far it has rotated since it was last cleared The Digi Pot Counter increases when the Digi Pot is moving at 32 counts per rotation When the Digi Pot is not moving sending this command will clear the Digi Pot Counter When the Digi Pot is moving this command reads the Digi Pot Counter When the Digi Pot is moving clockwise the counter increases When the Digi Pot is moving counter clockwise the counter decreases The following table details the structure of the characters in the data field for the DIGIPOT STATUS command Char 7 Sign Char clockwise counterclockwise Char 6 5 4 Integer number of counts since last cleared Char 3 Decimal Point Char 2 0 Char 1 0 Char 0 0 To read the current status of the Digi Pot send the following Command Packet Read 1101 1944000 00028 Reads DIGIPOT STATUS Chapter 4 Remote Interface Reference End Code Reference End Code Reference 00 Normal Ending Command in the Command Packet
41. F State Automatically Saved WxDxH 4 25 x 12 x 6 5 108 mm x 305 mm x 165 mm 4 5 kg 10 Ibs Temperature Control Short Term Stability 1 hr Long Term Stability 24 hr Setpoint Resolution TEC Output Bipolar Output Current Compliance Voltage Maximum Output Power Current Limit Range Control Loop Proportional Gain adjustable Integrator Time Constant adjustable Differentiator adjustable Acoustic Noise Warm Up Time Warranty Remote Interface Accessories Included Cleaning Instructions Electrical Specifications lt 0 002 C lt 0 005 C 12 bit D to A 5 0A 8V 40 W Oto 5 0A P PI PD PID AutS Autd 0 to 100 Amps Volt OFF or 0 4 to 10 0 seconds OFF or 1 to 100 seconds Display 4 digit Temperature Resistance TE Current TE Voltage Measurement Resolution Sensors Supported Thermistors RTDs AD590 LM335 LM35 Stability quoted for a typical 10 KQ thermistor at 100 uA bias current One hour to rated stability 26 dBa 1 hour 1 year standard RS 232 standard User s Guide Test Report connector kit and power cord Clean with dry lint free cloth 199 9 to 199 9 C 0 to 499 9 kQ 5 00 to 5 00 A 9 99 to 9 99 V 15 bit A to D 0 to 499 9 kQ 0 to 499 9 kQ 129 25 130 5 Amp 40 Watt Temperature Controller Wavelength Electronics 4 25 108 mm 7 10 180mm Chapter 5
42. FcsCmd GetLength ucCharldx ucFCS BYTE srPreFcsCmd GetAt ucCharldx return ucFCS srPreFcsCmd contains the Command Packet up to the FCS characters e The instrument always checks the Command Packet s FCS against the calculated FCS The host computer program can use the Response Packet s FCS to verify proper communication from the instrument but it is not necessary ARVY gt T 123 124 Chapter 4 Remote Interface Reference Example BASIC Control Program for IBM PC Compatible Machines Example BASIC Control Program for IBM PC Compatible Machines 1000 LFI 3751 RS 232 Control Program for IBM PC Compatible Machines 1001 1002 Configure the COM Port 1 for RS 232 communications with the following settings 1003 1004 Baud 19200 1005 Parity None 1006 Data 8 1007 Stop 1 1008 1009 OPEN COM 19200 N 8 1 CD0 CS0 DS0 RB256 RS FOR RANDOM AS 1 LEN 256 1010 1011 Get the instruments RS 232 address 1012 1013 PRINT Enter instrument s RS 232 address i e 01 1014 INPUT ADDRESS 1015 1016 The following loop issues command packets to the instrument and prints out the 1017 instrument s response packets 1018 1019 RS232LOOP 1020 1021 Determine if the command is a read or write command and enter a valid command 1022 code Enter a valid data field 1023 1024 PRINT Enter command type 1 Read 2 Write
43. In pin 6 and Clear to Send In pin 8 e Pins 5 6 8 and 20 on the LFI 3751 RS 232 Input Connector do not connect to any internal circuitry DB rial j 9 Serial Connection DB 9 to DB 25 RS 232 Host Computer Wavelength Cable LFI 3751 First Unit RS 232C Connector CRS 801 6 feet RS 232 Input Connector Data Carrier Detect In 1 Receive Data In 2 Instrument Receive In Transmit Data Out 3 Instrument Transmit Out Data Terminal Ready Out 4 Signal Ground 5 Data Set Ready In 6 Request to Send Out 7 Signal Ground Clear to Send In 8 Ring Indicator In 9 D Sub SHELL SH D Sub SHELL DB 9 DB 9 DB 25 DB 25 Male Female Male Female D Sub Shell on LFI 3751 is connected to chassis Always properly earth ground the LFI 3751 chassis through your AC power system DB 25 Serial Connection DB 25 to DB 25 RS 232 Host Computer Wavelength Cable LFI 3751 First Unit RS 232C Connector CRS 803 6 feet RS 232 Input Connector Protective Ground 1 Transmit Data Out 2 Instrument Receive In Receive Data In 3 Instrument Transmit Out Request to Send Out 4 Clear to Send In 5 Data Set Ready In 6 Signal Ground 7 Signal Ground Data Carrier Detect In 8 Data Terminal Ready Out 20 D Sub SHELL SH D Sub SHELL DB 25 DB 25 DB 25 DB 25 Male Female Male Female D Sub Shell on LFI 3751 is connected to chassis Always properly earth ground the LFI 3751 chassis through your AC power system 78 Chapter 4 Remo
44. LIM NEGATIVE For example to configure the instrument with maximum currents of 1 Amp and 0 5 Amps send the following two Command Packets Write 1101207 001 00020 Sets LIM I POSITIVE in Amps 1101208 000 5002D Sets LIM I NEGATIVE in Amps To read the instrument s limit current settings the Command Type changes from a WRITE 2 to a READ 1 Read 1101107 000 00022 Reads LIM I POSITIVE in Amps 1101108 000 0002D Reads LIM I NEGATIVE in Amps LIM POSITIVE ranges from 000 000 to 005 000 Amps LIM NEGATIVE ranges from 005 000 to 000 000 Amps To Configure for a Resistive Heater Set LIM POSITIVE to 000 000 Amps to operate a resistive heater 95 Chapter 4 Remote Interface Reference Setting Temperature Limits Setting Temperature Limits RS 232 For complete detail about setting the Temperature Limits see Chapter Commands Discussed 2 page 59 T LIM HIGH T LIM LOW e Separate high and low temperature limits are available to protect your load T LIM HIGH and T LIM LOW e For example to configure the instrument with temperature limits of 50 C and 0 C send the following two Command Packets Write 1101231 050 00021 Sets T LIM HIGH in C 1101232 000 00027 Sets T LIM LOW in C e To read the current temperature limits the Command Type changes from a WRITE 2 to a READ 1 Read 1101 131 000 00027 Reads T LIM HIGH in C 1101132 000 00024 Reads T LIM LOW
45. P to 30 1101211 001 00027 Sets I to 1 second 1101212 000 00025 Sets D to OFF _ R gt YVr T_o_ 97 98 Chapter 4 Remote Interface Reference Setting the P I and D Constants e To configure the instrument as a PD controller with P 30 and D 1 second send the following Command Packets Write 1101210 030 00024 Sets P to 30 1101211 000 00026 Sets I to OFF 1101212 001 00024 Sets D to 1 second e To configure the instrument as a PID controller with P 30 1 second and D 1 second send the following Command Packets Write 1101210 030 00024 Sets P to 30 1101211 001 00027 Sets I to 1 second 1101212 001 00024 Sets D to 1 second e To read the P I and D constants the Command Type changes from a WRITE 2 to a READ 1 Read 11011104 000 00024 Reads P 1101111 000 00025 Reads I 11011124000 00026 Reads D e P ranges from 001 000 to 100 000 e I ranges from OFF 000 000 or 000 400 to 010 000 seconds e D ranges from OFF 000 000 or 001 000 to 010 000 seconds Chapter 4 Remote Interface Reference Setting Temperature Setpoint Setting Temperature Setpoint RS 232 For complete detail about setting the Operating Temperature see Commands Discussed Chapter 2 SETT e To configure the instrument with a temperature setpoint of 35 C send the following Command Packet Write 1101203 035 00023 Sets SET T e To read the instrument s setpoin
46. Point Char 2 High Temperature Limit 0 OK 1 Error Char 1 Current Limit 0 OK 1 Error Char 0 Output Status 0 Output Off 1 Output On Sensor Bias Char 7 Sign Char manual automatic Configuration Char 6 NTC PTC Sensor 0 NTC 1 PTC Char 5 AD590 0 OFF 1 use 10 KQ resistor for feedback To Set Sensor Bias enter in Char 7 with 1or2 41 Char 4 10 mA 0 OFF 1 use 10 mA bias current settings in Char 6 0 Char 3 Decimal Point To Return to Auto Sensor Bias Current Char 2 1 mA 0 OFF 1 use 1 mA bias current enter in Char 7 or Char 1 100 uA 0 OFF 1 use 100 uA bias current turn off power Char 0 10 uA 0 OFF 1 use 10 uA bias current MOD Gain Char 7 Sign Char manual automatic Configuration Char 6 Not Used To Set Analog Input z Gain BNC on rear Char 5 Not Used panel enter in 1or2 42 Char 4 Not Used Char 7 with settings in Char 3 Decimal Point Char 2 0 To Return to Auto Char 2 Mod Gain 3 100 1 0 OFF 1 ON Analog input Gain Char 1 Mod Gain 2 10 1 0 OFF 1 ON enter in Char 7 or turn off power Char 0 Mod Gain 1 1 1 0 OFF 1 ON RUN STOP 1or2 51 To Enable Output or Initiate Autotune Write data is XXX XX1 To Disable Output or Abort Autotune Write data is XXX XX0 Char 5 Autotune Error Codes 1 Zero Value Current Limit Error 2 Current Limit Cannot reach SET T 3 Non
47. Q to 4 5 kQ 10 mA 0k to 0 45 kQ 39 Chapter 2 Front Panel Operation Controlling Temperature with RTDs lia lie 3 RTD Temperature vs Resistance vs T response The LFI 3751 uses three data pairs to configure an RTD A B and C To indicate you re using an RTD the first data pair A must be 1 000 1 000 150 Enter A 1 000 1 000 B T R and C T R through the front panel 140 e or A1 A2 B1 B2 C1 and C2 via the RS 232 interface RTD 1320 resistance changes almost linearly with temperature Depending on your need ie for accuracy the LFI 3751 offers two methods for modeling RTDs Linear or ino Callendar Van Dusen Curve fit 90 80 0 Resistance Q T1 R1 100 Temperature C Linear Configuration Constants Linear RTD Configuration p Fh Ry oT The first method assumes the RTD temperature response to be linear Enter T T two Temperature Resistance data pairs B T R and C T R R R R resistance at 0 C and alpha are calculated to derive temperature from alpha a 2 1 the measured RTD resistance R All resistances are in ohms and T is R T T in C Note that R is typically the resistance the RTD is known by i e a 100 Q RTD is usually 100 Q at 0 C R RTD Resistance at 0 C T R amp T R B amp C entries alpha Normalized AR vs Temperature Linear Temperature Calculation T Raro Po RID R alpha R
48. RATURE CONDITION CORRECTED PRESS OUTPUT S Ng BUTTON Sensor Error LED amp Correcting the Sensor Error Press Output Button SENSOR ERROR gt N17 2 Ca BEEP ZN MS SENSOR ERROR LED flashes Sensor is either OPEN or SHORTED Output forced OFF to clear error OUTPUT ow o O IS SENSOR ERROR CONDITION CORRECTED gt BEEPS lt gt LONG j BEEP Press Output Button to re enable output current OUTPUT o g SF O a mg IS SENSOR J ERROR CONDITION CORRECTED PRESS OUTPUT nla 5a BUTTON Adjusting RS 232 Address SHIFT REVOTE RS 232 Address Displayed while Shift r NIZ 7 7 Continuously NI Z a Sa Hold the Shift gt BEEP ys ss BEEP ys tater ae n Button O LIN NN AN utton released new address if changed is After 3 seconds REMOTE RS 232 saved and unit beeps LED lights solid red unit beeps Remote RS 232 LED REMOTE A flashing RS 232 LED indicates active communication RS 232 D REMOTE RS 232 LED flashes between computer and instrument BEEP unit BEEPS ce Pepin EA 3 A solid RS 232 LED indicates the instrument is under Z7IN p remote RS 232 control but communication between computer and instrument is not active Enable Disable Output Current During Continuous RS 232 Operation OUTPUT REMOTE S REMOTE OUTPUT NI RS 232 TEMP LIMIT ON W RS 232 o BUTTON LAN NI7 S17 UTTO cal a
49. S 232 e Prior to writing a Calibration or Diagnostic Command Packet the instrument Commands Discussed must be given the proper password To confirm the PASSWORD send PASSWORD eight ASCII characters in the actual password Write 11 01254 FCS PASSWORD e This data field does not follow the standard format These eight characters are only restricted to ASCII characters e The PASSWORD can be obtained by calling Wavelength Electronics Technical Support or your local distributor e To read the status of PASSWORD access send the following Command Packet A 0 returned in Character 0 indicates the PASSWORD has not been issued A 1 returned in Character 0 indicates the PASSWORD has been issued properly Read 1101154 000 00024 Reads Status of password flag 108 Chapter 4 Remote Interface Reference Reading Serial amp Model Numbers Firmware Version Reading Serial amp Model Numbers Firmware Version RS 232 e These data fields do not follow the standard format These eight data Commands Discussed field characters are only restricted to ASCII characters SERIAL NUMBER P A FIRMWARE VERSION cain the instrument s Serial Number send the following Command MODEL NUMBER acket Read 1101155 000 00025 Reads Serial Number XXXXXXXX e To read the instrument s Firmware Version send the following Command Packet Read 1101156 000 00026 Reads Firmware Version XXXXXXXX e To read
50. The LFI 3751 with Autotune PID is a high performance temperature controller specifically designed for sensitive applications Now with Autotune PID capability the LFI 3751 automatically optimizes virtually any thermal load reduce overshoot or improve temperature stability with the push of a button Key Features e lt 0 002 C temperature stability even at ambient e Controls temperature with thermistors RTDs LM335 or AD590 The Wavelength Advantage Autotune PID N PID Constants adjustable via front panel AN Auto ranging thermistor amp RTD bias current i Bipolar or Unipolar output current operation N High and Low Temperature Limits i Auxiliary temperature sensor input A Analog input allows for external temperature control Analog model only A Addressable RS 232 interface LFI 3751 with Autotune PID Thermoelectric Temperature Controller LF1I3751 00400 C Rev D The Front Panel at a Glance MODEL LFI 3751 Status Section a Digi Pot Adjust Knob TEMP LIMIT T LIMIT LIMIT I Temp Limit E o Button REMOTE SENSOR Co Units of C 4 Digit Display a Measuig AMPS VOLTS Display OSO Section Display Select Switch Shift Button Output Section Sensor ro me isis Output Button Reference Section 5 Amp 40 Watt Temperature Controller avelength Electronics AC Power Switch While displayed Parameter can be changed by rotating Digi Pot Adjust Knob Digi Pot Adjust Knob is disabled Monitor parameter onl
51. The temperature limits will not be updated until the Digi Pot stops moving The T LIMIT LED in the Status Section lights solid red to indicate the limits are displayed and can be adjusted The Temperature Limits are disabled when thermistors or RTDs are configured to display resistance rather than temperature High Temp Limit and Low Temp Limit settings are saved in non volatile memory If you push and release the TEMP LIMIT Button or rotate the Display Select Switch while displaying the temperature limits the display will revert to the prior Display Select Switch selection If the T LIMIT LED flashes and the unit beeps the load temperature has exceeded one of the limits The output is forced off Press the Output Button to clear the error If cleared the unit beeps three times Press the Output Button again to re enable output current If the error persists the unit will sound a long beep Once the error is corrected you can press the Output Button to re enable output current RS 232 Command T LIM HIGH T LIM LOW a hh 57 ACTT SETT TEI ZN C Default P I amp D Constants TEV uM AUXT c bE BEE 30 P 1 second 1 0 OFF D decrease 9 increase Display Proportional Gain Chapter 2 Front Panel Operation Manually Setting the P I and D Constants Manually Setting the P I and D Constants Selecting optimum PID control parameters tha minimiz
52. To measure the thermoelectric current out of the instrument send the following Command Packet Read 1101105 000 00020 Reads TE I in Amps e To measure the thermoelectric voltage out of the instrument send the following Command Packet Read 1101106 000 00023 Reads TE V in Volts 102 Chapter 4 Remote Interface Reference Measuring Auxiliary Sensor Temperature Measuring Auxiliary Sensor Temperature RS 232 For complete detail about measuring temperature with the auxiliary sensor Commands Discussed see Chapter 2 AUX T e To measure temperature of the auxiliary 10 KQ thermistor wired to the instrument send the following Command Packet Read 1101109 000 0002C Reads AUX T in C 103 Chapter 4 Remote Interface Reference Setting Gain for Analog Input Signal Rear Panel BNC Connector Setting Gain for Analog Input Signal Rear Panel Hess BNC Connector Commands Discussed e The instrument automatically sets the gain of the Analog Input Connector to match your sensor and bias current configuration You can manually MOD Gain Configuration control the gain through the MOD Gain Configuration command For Analog Input Gain 3 if you put in 1 Volt at the BNC the setpoint changes 0 01 Volts Write 11 01242 000 1 0021 Sets Analog Input Gain to manual 100 1 e The following table details the structure of the characters in the data field Char 7 Sign Char manual automatic Char 6 Not
53. al times to properly balance the charge on the integrator to deliver the correct output current The calculated value of integrated time constant depends on whether the thermal load has been optimized using Setpoint Response or Disturbance Rejection Tuning Setpoint Response determines from the thermal load s time constant T Disturbance Rejection uses the thermal load s lag time L to calculate Notice that T is always greater than L and so that Setpoint Response Tuning always calculates a more conservative value of Too large a value of is detrimental when rejecting disturbances because a slower charging integrator will take longer to settle the load s temperature 3 Differentiator Time Constant D and Autotune Optimization The differentiator s time constant D is also measured in seconds The differentiator uses the derivative of the Error Voltage versus time to compensate for the proportional gain s and the integrator s tendency to cause the thermal load s temperature to overshoot the setpoint temperature To understand the differentiator we must first examine how the proportional gain responds as the load s temperature approaches the setpoint temperature As long as the Error Voltage is non zero the proportional gain will drive the output to move the thermal load s temperature towards the setpoint temperature The proportional gain stops driving the output current once the Error Voltage drops to z
54. al Gain counter clockwise to change the value displayed to AutS Wait about two seconds before starting an Autotune sequence e Rotate the Display Select Switch to Shift Button ON e Rotate the Digi Pot Adjust Knob to change the value displayed If 0 Autotune will optimize your system without an integrator If 0 Autotune will optimize your system with the integrator function e Rotate the Display Select Switch to D Shift Button ON e Rotate the Digi Pot Adjust Knob to change the value displayed If D 0 Autotune will optimize your system without a differentiator If D 0 Autotune will optimize your system with the differentiator function e Refer to pages 30 amp 31 for a discussion of the integrator and differentiator functions e RS 232 Command P I D 26 Chapter 2 Front Panel Operation Autotune PID Operation decrease N B Disturbance Rejection Tuning ce increase Rotate the Display Select Switch to P Shift Button ON e While the output current is disabled rotate the Digi Pot Adjust Knob counter clockwise to change the value displayed to Autd Wait about two seconds before starting an Autotune sequence e Rotate the Display Select Switch to Shift Button ON e Rotate the Digi Pot Adjust Knob to change the value displayed If 0 Autotune will optimize your system without an integrator If 0 Autotune will optimize your system with the integrator function e Rotate the Display Se
55. automatic Char 6 Sequence Lamps 0 OFF 1 Lamp ON Char 5 All Lamps ON 0 OFF 1 Lamp ON Char 4 7 Segment Displays 0 OFF 1 Lamp ON Char 3 Decimal Point Char 2 Unit of Measure amp Shift LEDs 0 OFF 1 Lamp ON Char 1 Status LEDs 0 OFF 1 Lamp ON Char 0 Output ON LED 0 OFF 1 Lamp ON PUSHBUTTON 1 92 OUTPUT SHIFT amp TEMP LIMIT Pushbutton Status SWITCH STATUS Char 7 Sign Char Not Used Returns Char 6 5 4 Not Used Returns 000 Char 3 Decimal Point Char 2 Temp Limit Pushbutton 0 OFF 1 ON Char 1 Shift Pushbutton 0 OFF 1 ON Char 0 Output Pushbutton 0 OFF 1 ON 1 94 To check the lamps enter in Char 7 with settings in Char 6 0 To return to Normal Operation enter in Char 7 or turn off power ROTARY Rotary Switch Status SWITCH STATUS A 1 indicates position of rotary switch Char 7 Sign Char Not Used Returns Char 6 AUXT C Char5 LIM1 B Char4 TEV A Char 3 Decimal Point Char 2 TEI D Char 1 SETT I Char 0 ACTT P DIGIPOT STATUS Read Digi Pot counter Char 7 Sign Char clockwise counterclockwise When DIGI POT is not moving this command clears Char 6 5 4 Integer Number of Interrupts since last cleared the DIGI POT counter Once the DIGI POT is moving this command reads the DIGI POT counter Char 3 Decimal Point The counter will contain the number of interrupts Char
56. cbectapasieedoal stud sdecwcanuevstessactectcesdestatuenctvensavnieiys 121 Calculating FOS sicceccctsateccnnei ci acensed cencessescesnsecsssetndecescanecsdeeseassacesacceeascesndesstareategscecaxsctsncecunes 123 Example BASIC Control Program for IBM PC Compatible Machines sscseen 124 Cha pter 5 Specifications ccc cassettes asec cence cece ti atecetnteicnsceencteecennnsies 127 General SpeCifiGatiOms vices ices sis cssecesci case cccc sendy sosecesen cide cte deste ewep anouda NE Enan biua sda o ns ka SSH ERNS ES 129 Electrical SpeCifiGations wi lt 2 cecccccccescccseccenceesnccesnasasteesacccuuesscesnceenteesandcecesvteecescesceeesaazctcess 129 Mechanical Specifications iii si ccsicce si ccccecetcesece cece ee cesescensvstinseeseote ceceeseer ceseeeneeniveneeciees 130 Appendix CAT 220 Cable Accessory Diagram csssseeceesssseeeeeeeeeeeeneeneeeeenseeneees 133 12 Chapter 1 Quick Start 14 Chapter 1 Quick Start Quick Start This chapter shows how to set up an LFI 3751 Become familiar with the temperature controller by following the Nine Steps to Operating the LFI 3751 for a thermoelectric load with a 10 kQ thermistor temperature sensor Later chapters expand on this information and offer complete reference information Chapter 1 Quick Start Preparing the Temperature Controller for Use Preparing the Temperature Controller for Use The following steps help you verify the temperature controlle
57. ct Switch to TE V Shift Button OFF to monitor the voltage across the thermoelectric This page intentionally left blank hh CC A 20 Chapter 2 Front Panel Operation ah 21 22 Chapter 2 Front Panel Operation Front Panel Operation By now you should be familiar with the Autotune PID feature how to measure temperature thermoelectric current amp voltage and how to set various operating parameters If not we recommend you read Chapter 1 Quick Start starting on page 13 This chapter details basic operation with each sensor how to set limits and control parameters and how to monitor actual results Corresponding remote interface commands are briefly noted Complete RS 232 commands are detailed in Chapter 4 For sensor configuration the following notation is used A B or C refers to the Display Select Switch settings Each sensor type requires different configuration data The data entered for A B and C changes for each sensor T and R refer to Temperature and Resistance data pairs used to characterize resistive sensor s response to temperature Subscripts are used when more than one data pair is required Slope and Offset are used to characterize the non resistive sensor s response to temperature changes Text in brackets e g A1 refers to the corresponding RS 232 command TE Current Temperature Time When started Autotune generates a step response to characterize I
58. e overshoot and maximize stability is even easier now when using the LFI 3751 with Autotune PID Refer to Autotune PID operation on page 23 for a detailed description of the Autotune feature The LFI 3751 can be configured to operate as a P PI PD or PID temperature controller The following sections discuss how to manually adjust the P I and D constants For most small loads set the Proportional Gain to 30 the Integral Time Constant to 1 second and Differentiator Time Constant to OFF 0 The P l and D settings are saved in non volatile memory When first controlling a load adjust only the P term while leaving the I term at 1 second and the D term OFF If the load will not stabilize for any P term then increase the I term to 2 seconds Again adjust the P term to optimize the system Repeat these steps until the load temperature stabilizes around the setpoint temperature Use the D term to reduce overshoot and to damp the system Adjusting the P Term Rotate the Display Select Switch to P Shift Button ON Rotate the Digi Pot Adjust Knob to change the displayed value The Proportional Gain range is AutS Autd and 0 to 100 RS 232 Command P Increasing the proportional gain will improve overall temperature stability Since most thermal systems are gain limited too high a proportional gain can cause thermal cycling or instability in the instrument s control loop If you notice the temperature of your load cycling aro
59. e the load temperature to fall back towards ambient The larger the P value the closer the proportional gain will settle the load to the desired operating temperature Likewise the larger the P value the greater the tendency to cause temperature overshoot L and R affect the proportional gain setting P A long thermal lag L decreases the proportional gain value P also decreases when R__ the max maximum temperature versus time slope is large Setpoint Response Tuning results in smaller P values than Disturbance Rejection Tuning because lower proportional gains produce less temperature overshoot of the setpoint temperature 2 Integrator Time Constant I and Autotune Optimization The integrator time constant I is measured in seconds The integrator function forces the actual temperature to stabilize at the setpoint temperature something the proportional gain cannot do alone This is accomplished because the integrator integrates the Error Voltage over time When the actual temperature is far from the setpoint temperature the integrator charges more quickly since the Error Voltage is large at this point As the actual temperature approaches the setpoint temperature the Error Voltage decreases and the integrator charges less quickly until finally the Error Voltage is zero Once the Error Voltage is zero the integrator stops charging and controls the output current at the necessary level to maintain a constant load
60. easuring Actual Temperature or ResistanCce sssssssennseenunrnnnnrnnnnennnnnnunnnnnnnnnnnnnnnnn nunna 94 Setting the Limit Currents acccsiccsiegccaceacececcnsesenscsnceateccsecescscecerectsccnceneseanccesnareszeczceeesectsaeceanee 95 Setting Temperature LIMMS sisiicciicciseeisseccceciccessscerercentesterensevseeseedeesenscteeeeteneseeenerdviniacceeeues 96 Autotune PID amp Setting the P I and D Constants cccccceseeeeseeeeeeseeeeeeeeeeesseeeeeseeeeeeeee 97 Setting Temperature Setpoint ssss ssoresnsnsnssnonannsnonnnnannnnnnannannnannannannnnnndannnnnnanannnnnaasnnananne 99 2 Setting Resistance Setpoint s snssnssansnnnnonnnnnnnnnnannannnnnnannnnnnnnnannnnnannnnnnannanannnnannnnnnanannnnannn 100 c Enabling and Disabling the Output Current ccseecseeeseeeeseeeeeeeeseeeeeeeseeneneeeeeeeeneeeneeeae 101 2 Measuring Thermoelectric Current and Voltage cs cssccseeeseesseeeseeeeeesseeeseeeeeseeeeeeeeneets 102 S Measuring Auxiliary Sensor Temperature csccsscccsecsseesseeeseeesseesneeeseeeeneneseeessneeseeeeneeeae 103 6 Setting Gain for Analog Input Signal Rear Panel BNC Connector ccssccsseseereeeeee 104 S Checking the Alarm Status 0 ccscccssicecscesserensccnserenscscneeensesenseetecencneenseenteeesteeseresteennecennes 105 o Halting the Processor sciiiscsccsteseccnssccssnccsscscnecsnsseesencuseraentesassecsanacrscassedeausisenssarssanauensaeecasuoats 106 ro Reverting to LOCAL MOd aii icscccsc
61. easuring and controlling temperature with an LM35 is properly entering the configuration data An LM35 produces a voltage that changes linearly with temperature To indicate to the LFI 3751 that the sensor is an LM35 A 4 000 4 000 To characterize the linear response the LFI 3751 requires a Slope and Offset For the LM35 B Slope and C Offset With this information the LFI 3751 can calculate temperature from LM35 voltage and properly calculate the setpoint voltage from the setpoint temperature BOE Gee Default LM35 Configuration A 4 000 A1 4 000 A2 B Slope 10 00 mV C B1 C Offset 0 0 mV C1 LM35 TO0 46 1 Wiring an LM35 metal can package Vs Vn Wire the LM35 to the Output Connector on the rear panel Shielded pris cables are available Wavelength part number CAT 220 Do not exceed 1 meter cable length Refer to Sensor Error Condition on page 55 if you can t clear a Sensor Error TO 92 plastic package V topin8s E to pin 5 GND to pin 4 Bottom View 240 KQ for either package 2 Temperature vs LM35 Voltage LM35 Temperature V mas Pumas The LM35 produces a voltage that changes linearly with temperature in T a Celcius The LFI 3751 requires a Slope and Offset to model this response we mathematically To indicate you re using an LM35 A 4 000 4 000 To T LM35 Temperature C _ _ V Voltage across pins 4 amp 5 configure the response B Slope and C O
62. ent s ACT T Slope and Offset To read the uncalibrated ACT T voltage send the following Command Packet Read 1101 171 000 00023 RAW ACT T VOLT in Volts Reading the uncalibrated TE voltage This command reads the uncalibrated TE voltage from the instrument s A D This command is useful for calculating the instrument s TE Slope and Offset To read the uncalibrated TE voltage send the following Command Packet Read 1101 172 000 00020 RAW TE I VOLT in Volts Reading the uncalibrated TE V voltage This command reads the uncalibrated TE V voltage from the instrument s A D This command is useful for calculating the instrument s TE V Slope and Offset To read the uncalibrated TE V voltage send the following Command Packet Read 1101 173 000 00021 RAW TE V VOLT in Volts Chapter 4 Remote Interface Reference Calibration Measurement Slopes amp Offsets Calibration Measurement Slopes amp Offsets RS 232 e All measurements are calibrated at the factory To change these Commands Discussed calibrated values you must first send the PASSWORD command PASSWORD You should not use these commands without direct supervision from ACTT SLOPE CAL Wavelength Electronics Technical Support Group ACT T OFFSET CAL Write TE I SLOPE CAL TE OFFSET CAL 1101254272222222 FCS PASSWORD TE V SLOPE CAL TEN OFFSET CALI Calibrating ACT T Slope amp Offset e These commands are used to calculate the
63. er is ready for normal operation 16 Chapter 1 Quick Start Preparing the Temperature Controller for Use DE Performa complete self test The complete self test is a more extensive set of tests than those performed at power on Hold down the Shift Button as you power the unit on with the AC Power Switch A complete self test will start after holding the Shift Button for three seconds If the self test is successful PASS is displayed If the self test is not successful FAIL is displayed If FAIL is displayed see Step F for information on returning the unit to Wavelength for repair If the temperature controller does not turn on Verify that there is AC power to the temperature controller First check that the AC Power Switch is in the ON position Also make sure the power cord is firmly plugged into the Power Entry Module on the rear panel Check that the fuse in the rear panel fuse holder is in place and functional You should also make sure that the power source you plugged the temperature controller into is energized If the controller fails step D or still does not turn on Call your nearest Wavelength Electronics sales office for instructions on returning the temperature controller to Wavelength for service In North America call the factory directly at 406 587 4910 Fax to 406 587 4911 or email Customer Service at sales teamwavelength com If you live outside North America contact the international
64. erature controller specifications If your LFl 3751 fails within one year of purchase Wavelength Electronics will repair it free of charge If you have questions relating to the operation of the LFI 3751 you can contact Technical Support Call 406 587 4910 in the U S Fax 406 587 4911 email Sales teamwavelength com If you have purchased the controller from an international distributor please contact them for technical support or repairs 10 This page intentionally left blank Table of Contents Ch a pt r 1 Quick SUA rics cic cates ca esac sce aaea ete cee ace EEEN AEE EPIKE 13 Preparing the Temperature Controller for USC cscceecessesseeesseeeseeeseeeseeeeeeeeeneeeeeeeeneees 15 Nine Steps to Operating the LFI 3751 cccseceseeseesseeeseeeeeneeeeeeeseeeaeeesseeeneeaeseeeneeeeeeeenenes 17 Chapter 2 Front Panel Operation ccsssseeeeesseeeeeesseeeeessseeeeeeeseeneeseees 21 Autotune PID Operation ciiiissiiccsccedecscssccceaceseeeseteccces cases snecects secensectestueneteesctecsacesecessttecateveces 23 Theory of Autotune PID ccceecsseeenseeeeeesceeeeseeeeaseeeeaseneesseeeeeaseeesaseneeeseeeeeesenesaseneeenseenenees 30 Controlling Temperature with Thermistors cseceeceseeseeeeeeeeeeeeeeeeeseeenseeeseeenseeeeeeeeenees 35 Controlling Temperature with RTDS c cccseseeeeseeeseeeeeeeeseneeeneeeeeenseesseeenseaeseeeneeeseeeeneeess 39 Controlling Temperature with an AD590
65. erentiator value also depends on the magnitude of proportional gain A larger proportional gain results in a larger differentiator time constant to compensate for the proportional gain s tendency to cause overshoot The Setpoint Response Autotune results in smaller values for D than the Disturbance Rejection Disturbance Rejection Autotune takes advantage of the differentiator s resistance to temperature variations at the thermal load to suppress the effects of thermal transients If your thermal load operates in an electrically noisy environment it might be to your advantage to turn the differentiator off since the differentiator will interpret the resulting fast variations in the Error Voltage incorrectly as thermal load temperature variations The differentiator can actually cause poorer temperature stability in this instance Understanding the Differentiator A real life analogy If you still do not understand the differentiator function fortunately the LFI 3751 Autotune PID eliminates the need to completely comprehend this control parameter None the less this following real life example may give you some insight into the differentiator Consider the everyday situation of braking a car for a STOP sign Imagine that the location of the STOP sign is our setpoint temperature and the location of our car is the load temperature When we are far away from the STOP sign we step on the accelerator to quickly get to the STOP sign This is exact
66. ero when the load s temperature equals the setpoint temperature At this point the load s thermal inertia forces it to overshoot the setpoint temperature It is not until the Error Voltage reverses polarity that the proportional gain provides an output current that drives the actual temperature back towards the setpoint temperature which now results in an undershoot condition The differentiator is dependent on the slope of Error Voltage versus time and not its magnitude The faster a load responds the more the differentiator forces the output current to reduce changes in the Error Voltage Unlike the proportional gain that moves the load temperature to the setpoint temperature the differentiator forces the output current to maintain a stable temperature or zero slope whether the load s temperature is at the setpoint temperature or not Therefore the differentiator produce s a braking current that resists changes to the thermal load temperature 31 Chapter 2 Front Panel Operation Theory of Autotune PID Obviously the differentiator should not be set so high that it counteracts the proportional gain and integrator s attempts to move the load s temperature to the setpoint temperature The differentiator time constant is dependent on the thermal load s lag time L since this parameter contributes to the integrator overshooting the setpoint temperature A larger lag time results in a larger calculated D The diff
67. esponse Packet will return the instrument s interpretation of the value For example if the data field for the SET T Command Packet is 120 263 then the Response Packet will return 120 300 in its data field e The instruments measurements are updated about every 600 milliseconds with an additional delay of about 750 milliseconds every ten minutes when the unit automatically zeros the instrument s measurement A D The 19 2 k BAUD rate allows Measurement Reads about every 19 8 milliseconds The instrument returns the most recent value immediately so as not to tie up the interface in a multi packet multi instrument environment If a new measurement is required for each Command Packet program in a 800 millisecond delay between Command Packets e No Response Packet is returned from any unit unless it at least receives a valid Start Character a matching Unit Type and Unit Number 80 Chapter 4 Remote Interface Reference RS 232 Command and Response Packet Formats Command Packet Unit Type Command Command Type Command Start Unit Data FCS 1 Response Unit Command Command Start Type Unit Type 1 xX X X X X X X X X XIXIXI XxX X 76543210 Data Field Characters Command Start Response Start Unit Type Decimal Unit Decimal Command Type Decimal Command Code 00 99 Decimal End Code Decimal Data Decimal 00 99 XXX XXX 76543210 Data Field Characters
68. f an Autotune sequence the initial TE current is 10 of the limit current setting If the ramp rate decreases the current will be increased in 10 increments to maintain the ramp rate until the load reaches the setpoint temperature The LFI 3751 will display Error 2 E002 when the temperature setpoint cannot be reached using the TE Current Limit setting Temperature Limit Setting The Autotune sequence will abort if the thermal load temperature exceeds either temperature limit Resolution While completing the Autotune reduce the TE Current Limit or if your thermal load can withstand higher or lower temperatures then increase the Temperature Limit settings Setpoint Temperature Autotune will optimize the control parameters around the setpoint SET T that you have selected In temperature mode for thermistors the controller will capture the information used to calculate the control parameters When you change your setpoint the Autotune feature will automatically recalculate the PID terms for the new setpoint If your temperature limits and the SET T temperature are too close within about 5 C the sequence will probably reach the temperature limit and abort If an active device is under temperature control Avoid applying power to temperature sensitive devices during the Autotune sequence because extreme temperature fluctuations may occur Apply steady state power to the device for the best Autotune results E Choosing
69. ffset M mss LM35 Slope 10 mV C b LM35 Offset 0 mV Enter A 4 000 4 000 B Slope and C Offset through the front panel or ae A1 A2 B1 and C1 via the RS 232 interface LM35 51 Chapter 2 Front Panel Operation Controlling Temperature with an LM35 decrease Adjust A Enter A1 decrease oe Adjust B Enter Slope B1 3 4 Entering Data Pair A Rotate the Display Select Switch to A Shift Button ON The first two data pairs alternate on the display 4 000 4 000 indicates to the LFI 3751 that you re using an LM35 Rotate the Digi Pot Adjust Knob to change the value displayed A B and C cannot be adjusted while the output is on Data for A B and C are saved in non volatile memory RS 232 Command A1 004 000 A2 004 000 Entering Data Point B Rotate the Display Select Switch to B Shift Button ON to display the Slope in mV C Rotate the Digi Pot Adjust Knob to change the value Default from the factory sets up fora 10 mV C slope A B and C cannot be adjusted while the output is on Data for A B and C are saved in non volatile memory RS 232 Command B1 Slope Display Resolution Slope 1 00 to 20 00 mV C 52 Chapter 2 Front Panel Operation Controlling Temperature with an LM35 decrease 5 N P increase e Rotate the Display Select Switch to C Shift ButtonON Adjust C to display the Offset in mV Fo
70. fset to model this response mathematically To indicate you re using an LM335 A 3 000 3 000 To configure the response B Slope and C Offset Enter A 3 000 3 000 B Slope and C Offset through the front panel or A1 A2 B1 and C1 via the RS 232 interface 48 Chapter 2 Front Panel Operation Controlling Temperature with an LM335 decrease A increase 3 Entering Data Pair A Adjust A E A1 e Rotate the Display Select Switch to A Shift Button ON nter Jat The first two data pairs alternate on the display 3 000 3 000 indicates to the LFI 3751 that you re using an LM335 e Rotate the Digi Pot Adjust Knob to change the value displayed e A B and C cannot be adjusted while the output is on e Data for A B and C are saved in non volatile memory e RS 232 Command A1 003 000 A2 003 000 decrease 4 Entering Data Point B Adjust B 9 a Enter Slope B1 e Rotate the Display Select Switch to B Shift Button ON to display the Slope in mV Kelvin e Rotate the Digi Pot Adjust Knob to change the value Default from the factory sets up for a 10 mV Kelvin slope A B and C cannot be adjusted while the output is on e Data for A B and C are saved in non volatile memory e RS 232 Command B1 Slope Display Resolution Slope 1 00 to20 00 mV K 49 Chapter 2 Front Panel Operation Controlling Temperature with an LM335 decrease Adjust C increase Ente
71. hermistor Chapter 2 Front Panel Operation Controlling Temperature with Thermistors Controlling Temperature with Thermistors Key to accurately measuring and controlling temperature with a thermistor is properly entering the configuration data A thermistor s temperature response can be modeled by the Steinhart Hart equation To calculate the three Steinhart Hart coeffcients the LFI 3751 requires three data pairs A T R B T R and C T R Thermistor manufacturers provide this information in a table of Resistance vs Temperature data With the Steinhart Hart equation and coefficients the LFI 3751 can calculate temperature from thermistor resistance and properly calculate the setpoint resistance from the setpoint temperature 1 Wiring a Thermistor Wire the thermistor to the Output Connector on the rear panel Shielded cables are available Wavelength part number CAT 220 Do not exceed 1 meter cable length Refer to Sensor Error Condition on page 55 if you can t clear a Sensor Error 2 Automatic Bias Current A fixed bias current lpas flows from pin 5 through the thermistor and back into pin 4 to produce a voltage V As the thermistor resistance R changes the voltage changes V must be maintained between 0 and 5 V for proper operation The LFI 3751 automatically ranges between four bias currents 10 uA 100 uA 1 mA and 10 mA to optimize feedback while allowing a wider temperature range of operation H
72. icccccececcasteventecctcessnaesueccotesusewestuesctcesneeesiivactecacuessivessegenetss 107 Entering the PASSWORD lt 2 22 c0cccc scestecaneccacessnccessecasnactaecendeseaccsanessaedesaesscessteecenseseaeescnececeds 108 E Reading Serial amp Model Numbers Firmware Version ssussussusseusnunnnnnnunnnnnnnnnnnnnnnnnnnnnnnnn 109 Calibration Sensor Bias Current and AD590 Sense Resistance cesssseneeneeeeeee 110 Calibration ACT T TE I TE V uncalibrated voltages ccssscccssseceesseeeesseeeeseneeeesseeeeeeee 112 Calibration Measurement Slopes amp OffSets ccseccecsseeeseeeeeeeneeeeeeeeseeeeseeeseeeeeeeeneeeneee 113 Calibration SET T Slopes amp OffS tS cccsecsseceseeesseeeeeeeneeeeeseeeeeeeneeeeeneeseeeeseeeeeeeasenenseneeaee 115 Calibration TE Limit Current Slopes amp OffS tS csccseceeeeeeeeeeneeeeeeeseeeeseeeseeeneeeeneeeneee 116 RESTORE Calibration Defaults so iiicsccciseecssnevecceceucessstesecpectecuteveatiescuistecentivactecectsseseeusezecces 117 Diagnostic Lamp Control lt 2i cccccccccescccseccesceecncdescesssccesncentessncecenseanteesaeececeseteecuaceseueesanzctcess 118 Diagnostic Switch Status in cicccccccccccseececenesccesccevasceeceercseesseceneer see esis cure snevenmnenineneeecires 119 Diagnostic Digi Pot Status oi ciccc 2cccccesseis sect cccceectvaceeseetectesecaceanessncesenedederesaertecdevececveeesuees 120 End Code Reference iz ccctiscciicacciteccacescceecedastecee
73. igi Pot Adjust Knob While the knob is rotating the display will change but the instrument will not control to the new setpoint until the knob stops moving e The decimal point will move to display maximum resolution SETT is saved in non volatile memory RS 232 Command SETT Display Setpoint Resistance 10 Adjusting Thermistor Resistance Setpoint decrease e Rotate the Display Select Switch to SET T Shift Button OFF If 0 000 N 0 000 has been entered for A resistance will be displayed increase To adjust the setpoint rotate the Digi Pot Adjust Knob While the knob is rotating the display will change but the instrument will not control to the new setpoint until the knob stops moving The decimal point will move to display maximum resolution SET R is saved in non volatile memory Temperature Limits are disabled in Resistive Operating Mode RS 232 Command SET R ACTT SETT TEI 7IN ae O AUXT c TEV Gee CG Ce Default RTD Configuration A 1 000 A1 1 000 A2 B T 0 00 C B1 R 0 100kQ B2 Cc T 100 00 C C1 R 0 139kQ C2 2 wire RTD RTD Voltage pins 5 amp 4 Vm R RTD BIAS RTD Vhr Voltage across pins 4 amp 5 las LFI 3751 Bias Current Raro Resistance of RTD Chapter 2 Front Panel Operation Controlling Temperature with RTDs Controlling Temperature with RTDs Key to accurately measuring and controlling temperature with an
74. in C e Temperature Limits range from 199 900 to 199 900 C e The temperature limits are disabled when thermistors or RTDs are configured to display resistance rather than temperature 96 Chapter 4 Remote Interface Reference Autotune PID amp Setting the P I and D Constants Autotune PID amp Setting the P and D Constants RS 232 For complete details about Autotune PID operation see Chapter 2 Commands Discussed For complete detail about setting the P and D constants see Chapter 2 P l The LFI 3751 with Autotune PID can optimize the PID control parameters D to minimize temperature overshoot and reduce settling times with Setpoint Response Autotuning or to reject thermal transient effects on temperature stability by using Disturbance Rejection Autotuning The LFI 3751 can be configured to operate as a P PI PD or PID temperature controller e To configure the instrument to begin an Autotune Optimization send one of the following Command Packets Write 1101210 002 00023 Sets P to AutS 1101211 001 00021 Sets P to Autd e To configure the instrument as a Proportional P controller with P 30 send the following Command Packets Write 1101210 030 00024 Sets P to 30 1101211 000 00026 Sets I to OFF 1101212 000 00025 Sets D to OFF e To configure the instrument as a PI controller with P 30 and 1 second send the following Command Packets Write 1101210 030 00024 Sets
75. ing the Output Button will enable current 61 Chapter 2 Front Panel Operation Measuring Thermoelectric Current and Voltage Measuring Thermoelectric Current and Voltage Measuring Thermoelectric Current Display Thermoelectric Current n Rotate the Display Select Switch to TE Shift Button OFF Current in Amps will be displayed with 10 mA resolution The output current is limited by the positive and negative limit currents to 5 00 to 5 00 Amps When the output is disabled TE I will display a small current of up to 0 08 Amps This small current is being supplied to the output Do not remove the output connector until AC power to the unit is removed RS 232 Command TE Measuring Thermoelectric Voltage Display Thermoelectric Voltage Rotate the Display Select Switch to TE V Shift Button OFF Voltage in Volts will be displayed with 0 1 V resolution The measured voltage across pins 1 amp 2 can range from 15 00 to 15 00 V The measurement display assumes using the Wavelength cable part number CAT 220 which uses one meter of 20 AWG wire With a load up to 0 2 V will be displayed when the output is disabled Without a load approximately 11 V will be displayed RS 232 Command TE V Site 62 10 k Q Thermistor Wavelength part number TCS 610 Auxiliary Sensor Chapter 2 Front Panel Operation Measuring Auxiliary Thermistor Temperature Measuring Auxiliary Thermist
76. instrument s ACT T measurement Write 1101 274 001 00024 ACT T SLOPE CAL 1101275 000 00024 ACT T OFFSET CAL in Volts Calibrating TE I Slope amp Offset e These commands are used to calculate the instrument s TE measurement Write 1101 276 001 00026 TE I SLOPE CAL 1101277 000 00026 TE I OFFSET CAL in Amps Calibrating TE V Slope amp Offset e These commands are used to calculate the instruments TE V measurement Write 1101 278 001 00028 TE V SLOPE CAL 1101279 000 00028 TE V OFFSET CAL in Volts oo 113 114 Chapter 4 Remote Interface Reference Calibration Measurement Slopes amp Offsets Reading the ACTT TE I TE V Slopes and Offsets e Toread the measurement calibration settings the Command Type changes from a WRITE 2 to a READ 1 and no PASSWORD is required Read 1101174 000 00026 11011754000 00027 1101176 000 00024 11011774000 00025 1101178 000 0002A 1101179 000 0002B Reads ACT T SLOPE CAL Reads ACT T OFFSET CAL in Volts Reads TE SLOPE CAL Reads TE OFFSET CAL in Amps Reads TE V SLOPE CAL Reads TE V OFFSET CAL in Volts Chapter 4 Remote Interface Reference Calibration SET T Slopes amp Offsets Calibration SET T Slopes amp Offsets RS 232 e The setpoint temperature values are calibrated at the factory To change Commands Discussed these calibrated values you must first send the PASSWORD command PASSWORD You should not
77. ion Enable Output Ly Current BEEP ys S The time to complete an Autotune optimization oN O ON E sequence varies from load to load While tuning ee the ON LED will flash When complete the O gt Ol LFI 3751 beeps once and the ON LED lights solid Output Current Autotune Autotune Three audible beeps indicate if the Autotune Disabled Optimization Complete sequence is aborted The ON LED is not lit If the in Progress actual sensor temperature exceeds the high or low ON LED flashes temperature limits the optimization will abort See Page 23 for more detail on the LFI 3751 Autotune feature A totune Process The LFI 3751 ramps the thermoelectric current to drive the load toward the setpoint temperature Phase 2 The LFI 3751 performs three characterization passes Phase 1 Phase 2 Phase3 Phase 3 The LFI 3751 reverts to normal operation saving the optimized P and D settings in non volatile memory and settling in at the setpoint temperature The Front Panel at a Glance Displaying and Adjusting Values on the Front Panel Display Section SHIFT SHIFT a bral OFF OJ ON o AutS or Autd ACT T 199 9 to 199 9 c Autotune PID OR or 0 to 500 k Q 1 to 100 Amps Volt SET T_ 199 9 to 199 9 c OFF 0 OR OR 0 to 500kQ 0 4 to 10 0 secs TE l Na OFF 0 5 00 to 5 00 Amps M AMPS OR 1 to 100 secs TE V 000X C 12 0 to 12 0 Volts Sma VOLTS KO a LIM I
78. isplay Differentiator Time Constant Differentiator Time Constant Range OFF 0 0 ON 1 to 100 seconds 59 Chapter 2 Front Panel Operation Setting Operating Temperature or Resistance art CP sett C1 TE Co TEV LMI AUXT Default Setpoints e SETT 25 C SETT SETR 10kQ SET R e Display Setpoint Temperature or Resistance decrease 9 increase e _ temperature C or resistance kQ displayed 60 Setting Operating Temperature or Resistance Rotate the Display Select Switch to SET T Shift Button OFF Temperature or resistance will be displayed To adjust the setpoint rotate the Digi Pot Adjust Knob While the knob is rotating the display will change but the instrument will not control to the new setpoint until the knob stops moving The decimal point will move to display maximum resolution SET T or SET R is saved in non volatile memory RS 232 Command SETT SET R Display Resolution Temperature 199 9 to 20 0 C 19 99 to 99 99 C 100 0 to 199 9 C Thermistor amp Resistance 0 to 9 999 kQ RTD 10 00 to 99 99 kQ in Resistance Mode 100 0 to 499 9 kQ Thermoelectric 2 1 LETA O00 0000 Resistive Heater Chapter 2 Front Panel Operation Enabling Output Current Enabling Output Current 1 Wiring the Output Connector Wire the thermoelectric or resistive heater to the Output Connector on the rear panel with at least 20 gauge wire Shielded
79. istor Wiring Thermistor Example LM335 Wiring LM335 TO 46 Bottom View metal can package Bottom P k to pin 5 View Ge to pin 4 TO 92 plastic package Chapter 3 Rear Panel Operation Connector Pinouts Connector Pinouts 1 Output Connector 9 pin male D sub plug e The thermoelectric or resistive heater is wired between pins 1 amp 2 Regardless of your sensor type always attach the positive lead of the thermoelectric to pin 1 e The Auxiliary sensor 10 kQ thermistor Wavelength part number TCS 610 connects between pins 3 amp 4 e A thermally fused fan output is available to drive a 100 mA fan Wire the fan between pins 8 amp 7 e Pin 8 is also used to connect an LM35 e For thermistors RTDs or the LM335 connect the sensor between pins 5 amp 4 For an AD590 connect the positive terminal to pin 6 and the negative to pin 5 For an LM35 an external 240 KQ resistor is required See Chapter 2 for individual sections that detail the sensor usage Example RTD Wiring 2 wire RTD Example AD590 Wiring Bottom View AD590 TO 52 package View AD592 TO 92 package 71 Chapter 3 Rear Panel Operation Connector Pinouts Example LM35 Wiring LM35 TO 46 metal can package Sv TO 92 plastic package V topin8 Jic to pin 5 GND to pin 4 Bottom View for either package RS 232 Output 2 RS 232 Connectors 25 pin male D sub plug 7 These connec
80. it or use a thermoelectric with a lower voltage requirement E004 Error 4 Zero Slope e The load temperature is not changing over time Either the sensor signal is not changing no current is flowing to the thermoelectric or even with the maximum current flowing to the thermoelectric the load temperature is not changing e Correction Verify that the sensor is in good thermal contact with the load and that it is properly wired to the LFI Output Connector Verify that the thermoelectric is properly wired to the LFI Output Connector 29 TE Current Temperature i Time i When started 1 Autotune generates astep response I to characterize l your system 1 i 1 l 1 E I i 1 Rmax t I Farag Time sky Your system responds by going towards the setpoint Chapter 2 Front Panel Operation Theory of Autotune PID Theory of Autotune PID 1 Proportional Gain P and Autotune Optimization The proportional gain P is measured in Amps Output Current per Volt Error Voltage The Error Voltage is the difference between the LFI 3751 s Setpoint D to A and the measured sensor voltage feedback When a difference exists between the setpoint temperature and actual temperature the proportional gain directs the output power stage to supply an output current that is proportional to the difference Unfortunately if the Error Voltage drops to zero then so does the output current which will caus
81. lect Switch to D Shift Button ON e Rotate the Digi Pot Adjust Knob to change the value displayed If D 0 Autotune will optimize your system without a differentiator lf D 0 Autotune will optimize your system with the differentiator function e Refer to pages 30 amp 31 for a discussion of the integrator and differentiator functions e RS 232 Command P I D Proportional Gain 27 PRESS amp RELEASE on O O Output Current Disabled siy T 7 O Autotune Optimization in Progress ON LED flashes d7 Cal ZIN Autotune Optimization in Progress ON LED flashes Ja BEEP NE ON W O Autotune Complete Press amp Release O Output Button W BEEP BEEP a BEEP N OFF CI O Autotune Aborted Chapter 2 Front Panel Operation Autotune PID Operation 5 6 Start Autotune Optimization Prior to enabling current the thermoelectric and sensor must be wired to the LFI 3751 output connector and the current and temperature limits must be set Press the Output Button to enable current flow and start the Autotune optimization through the thermoelectric or resistive heater The Output LED will flash green When the Autotune is complete the unit will beep once and the Output LED will light solid green The new P I and D settings are written to non volatile memory RS 232 Command RUN STOP Manually Ab
82. lectroni AC Voltage Bozeman Montana USA MADE IN USA Select Switch Do not change this AC Fuse song wais Wari For 115 VAC operation install a 2000 maT 5 x 20 mm SLO BLO fuse supplied to the unit For 230 VAC operation install a 1000 maT 5 x 20 mm SLO BLO fuse Output RS 232 Input RS 232 Output 9 pin male D sub plug 25 pin female D sub receptacle 25 pin male D sub plug 190900000000000 1400000000000035 TEC 2 Instrument Receive In 2 Peripheral Transmit Out TEC 3 Instrument Transmit Out 3 Peripheral Receive In Aux Sensor 7 Signal Ground 7 Signal Ground Sensor 5 6 8 amp 20 shorted All other pins are floating Main Sensor All other pins are floating AD590 Voltage Fan Fan 12 V 12V F 2 a 4 5 6 T 8 o Thermally Fused to 100 mA ee In This Book Quick Start Chapter 1 prepares the temperature controller for use and familiarizes you with a few of its features Front Panel Operation Chapter 2 details the features and functions of the front panel You will find this chapter useful whether you are operating from the front panel or from the RS 232 interface Rear Panel Operation Chapter 3 details the rear panel features and connector pin outs Remote Interface Reference Chapter 4 details the RS 232 commands and responses Remote interface programs are provided to help you develop programs for your temperature control application Specifications Chapter 5 lists the temp
83. linearly with temperature The LFI 3751 requires a Slope and Offset to model this response mathematically To indicate you re using an AD590 A 2 000 2 000 To configure its response B Slope and C Offset Typically the Slope is 1 uA Kelvin and the Offset is 0 uA Enter A 2 000 2 000 B Slope and C Offset through the front panel or A1 A2 B1 and C1 via the RS 232 interface 45 Chapter 2 Front Panel Operation Controlling Temperature with an AD590 decrease increase Adjust A Enter A1 decrease Adjust B O henu Enter Slope B1 Entering Data Pair A Rotate the Display Select Switch to A ShiftButton ON The first two data pairs alternate on the display 2 000 2 000 indicates to the LFI 3751 that you re using an AD590 Rotate the Digi Pot Adjust Knob to change the value displayed A B and C cannot be adjusted while the output is on Data for A B and C are saved in non volatile memory RS 232 Command A1 002 000 A2 002 000 Entering Data Point B Rotate the Display Select Switch to B Shift Button ON to display the AD590 s Slope in pA Kelvin Rotate the Digi Pot Adjust Knob to change the value Default from the factory sets up for a 1 uA Kelvin slope A B and C cannot be adjusted while the output is on Data for A B and C are saved in non volatile memory RS 232 Command B1 Slope Display Resolution Slope 0 100 to 9 999 A K
84. ly what the proportional gain portion of our brain tells us to do since we are far from our destination and want to get there as quickly as possible The gears in our car are like the current limit function of the LFl 3751 a lower gear limits our acceleration rate towards the STOP sign and a lower current limit setting decreases how much gas we can apply and determines how fast we can approach the stop sign If we did not have a differentiator function in our brain we would not apply the brakes until after we went through the stop sign For most of us we stop accelerating our car and begin applying our brakes some distance before we reach the STOP sign This is exactly how the proportional gain and differentiator work in the PID control loop Now imagine that the road you are driving on is covered with ice this corresponds to thermal loads with long thermal lag times In the case of the icy road we would stop accelerating sooner and apply the brakes for a longer period of time Remember that a longer thermal lag time results in a smaller proportional time constant and a larger differentiator time constant 32 Chapter 2 Front Panel Operation Theory of Autotune PID 4 Temperature Sensors and Autotune Optimization Sensor type also affects the magnitude of the proportional gain value calculated when using Autotune optimization For sensors with high sensitivity a large change in sensor signal per C the resulting proportional
85. nd Code that is not recognized 23 Calculated FCS does not Match Transmitted FCS The Frame Check Sum is used to verify proper transmission of data If the calculated FCS does not match the transmitted FCS either the data was corrupted in transmission or the FCS in the Command Packet was incorrectly calculated 24 Parser Programming Error Please contact the factory if a Response Packet returns this End Code 25 Invalid Data Character The parser expects only a 0 or 1 in one of the data characters Some other ASCII value was transmitted 26 Query Calculation Error The LFI 3751 was unable to calculate the requested measurement Data in the Response Packetis 999 999 This occurs when the sensor is open or shorted This also occurs when the sensor is improperly configured or out of the temperature range 27 Sensor Data not Updated Sensor configuration data cannot be changed while the Output is ON 81 RS 232 Lamp Control Write Error The LAMP CONTROL command allows only one test condition at a time Only one of the data characters can be a 1 ee 122 BASIC Routine for calculating FCS Visual C Routine for calculating FCS Chapter 4 Remote Interface Reference Calculating FCS Calculating FCS e FCS Frame Check Sum is used to assure that the RS 232 transmission was not corrupted e The following BASIC routine calculates the FCS for a Command or Response Packet 1110
86. ng A lower Limit Current will increase the settling time since less power is delivered to the thermoelectric or resistive heater The LIM I LED in the Status Section flashes when the maximum current positive or negative is being sourced to the thermoelectric or resistive heater RS 232 Command LIM POSITIVE LIM NEGATIVE Display Resolution Positive LIM I 0 00 to 5 00 Amps Negative LIMI 5 00 to 0 00 Amps 56 Default Temperature Limits High Temp Limit 35 0 C T LIM HIGH Low Temp Limit 10 0 C T LIM LOW Display Temperature Limits decrease e increase REPEATS 3 TIMES T LIMIT N17 A ca BEEP 7 IN 7 T LIMIT LED flashes when load temperature exceeds either High or Low Limit Temperature One long beep sounds if error has not been corrected after pressing the Output Button Chapter 2 Front Panel Operation Setting Temperature Limits Setting Temperature Limits If the thermoelectric or resistive heater drives the load temperature beyond the temperature limits the output will shut off and the T LIMIT LED will flash Press and release the TEMP LIMIT Button The high and low limits will alternate on the display three times before reverting to the Display Select Switch selection Rotate the Digi Pot Adjust Knob to change the value displayed The LFI 3751 uses the lowest number as the Low Temperature LIMIT and the highest number as the High Temperature LIMIT
87. o 100 000 Amps Volt Integral Time Constant 000 000 OFF or 000 400 to 010 000 sec Differentiator Time Constant 000 000 OFF or 001 000 to 100 000 sec Sensor Configuration Term 199 900 to 199 900 C Sensor Configuration Term 000 000 to 499 900 kQ Sensor Configuration Term Range is a function of sensor See below Sensor Configuration Term Range is a function of sensor See below Sensor Configuration Term Range is a function of sensor See below Sensor Configuration Term Range is a function of sensor See below T LIM HIGH High Temperature Limit 199 900 to 199 900 C T LIM LOW Low Temperature Limit 199 900 to 199 900 C 0 These measurement values return full floating point precision Range of B1 Range of B2 Range of C1 Range of C2 Thermistor 199 900 to 199 900 C 000 000 to 499 900 kQ 199 900 to 199 900 C 000 000 to 499 900 kQ RTD 199 900 to 199 900 C 000 000 to 499 900 kQ 199 900 to 199 900 C 000 000 to 499 900 kQ AD590 000 100 to 009 999 uA K 009 990 to 009 990 uA LM335 001 000 to 020 000 mV K 009 990 to 009 990 mV Chapter 4 Remote Interface Reference Standard Command Code Listing Command Command Command Type Code Description and Data Field Range Alarm Status Char 7 Sign Char always Char 6 Sensor Open Error 0 OK 1 Error Char 5 Sensor Short Error 0 OK 1 Error 1 35 Char 4 Low Temperature Limit 0 OK 1 Error Char 3 Decimal
88. on Sensor Bias Current and AD590 Sense Resistance Comma 2 usse Calibrating the 10 mA Reference Current 10 mA BIAS CAL e lf the instruments 10 mA reference current is actually 10 262 mA send AD590 10 kQ CAL the following Command Packet to properly calibrate the unit Write 1101264 010 26223 10 mA BIAS CAL in mA Calibrating the 10 kQ Resistance for AD590 e lf the instrument s 10 KQ resistance is actually 10 003 kQ send the following Command Packet to properly calibrate the unit Write 1101265 010 00327 AD590 10 kQ CAL in kQ Reading the Sensor Bias Current and AD590 Sense Resistance Settings e To read the sensor bias and AD590 sense resistance settings the Command Type changes from a WRITE 2 to a READ 1 and no PASSWORD is required Read 1101161 000 00022 Reads 10 uA BIAS CAL in uA 1101162 000 00021 Reads 100 uA BIAS CAL in uA 1101163 000 00020 Reads 1 mA BIAS CAL in mA 1101164 000 00027 Reads 10 mA BIAS CAL in mA 1101165 000 00026 Reads AD590 10kQ CAL in kQ _ AY _Joe_ 111 RS 232 Commands Discussed RAW ACT T VOLT RAW TE I VOLT RAW TE V VOLT 112 Chapter 4 Remote Interface Reference Calibration ACTT TE I TE V uncalibrated voltages Calibration ACT T TE I TEV uncalibrated voltages Reading the uncalibrated ACT T voltage This command reads the uncalibrated ACT T voltage from the instrument s A D This command is useful for calculating the instrum
89. or Temperature This sensor input is available to monitor the temperature of an auxiliary zone e g heatsink or ambient It is calibrated to the TCS 610 10 kQ thermistor and uses a 100 uA bias current The temperature range of this sensor is 8 C to 150 C Only temperature can be displayed 1 Wiring the Output Connector Wire the thermistor to the output connector on the rear panel N Displaying Auxiliary Temperature Rotate the Display Select Switch to AUX T Shift Button OFF to display the auxiliary sensor temperature e The decimal point position changes automatically to display maximum resolution e f not installed four dashes will be displayed e RS 232 Command AUX T Display Resolution 199 9 to 20 0 C 19 99 to 99 99 C 100 0 to 199 9 C 63 Chapter 2 Front Panel Operation Measuring Auxiliary Thermistor Temperature TCS 610 Temperature vs Resistance Chart Temperature Resistance Temperature Resistance C Chapter 2 Front Panel Operation Measuring Auxiliary Thermistor Temperature Temperature Resistance Temperature Resistance C kQ C Default Address RS 232 address 01 Display RS 232 Address STATUS decrease oe N O Niy tmon increase Ea wowwForLocaa A J N Hold in for 3 seconds Release the SHIFT Button to save the displayed RS 232 address 66 Chapter 2 Front Panel Operation Setting the RS 232 Address Setting the RS
90. ort Autotune Optimization To abort the Autotune press the Output Button once The unit will beep three times The Output LED turns off and current flow is disabled The P I and D settings are returned to values set before starting Autotune 28 Chapter 2 Front Panel Operation Autotune PID Operation 7 Autotune Error Codes Four error conditions can occur that will abort the Autotune sequence When an error occurs the error is displayed as follows The error is also returned in the RUN STOP RS 232 command E001 Error 1 Zero Value Current Limit Error e The LFI 3751 detected that either the required positive or negative current limit was set to zero The LFI 3751 cannot drive the temperature toward the setpoint e Correction Set the limit to something other than zero E002 Error 2 Current Limit Cannot Reach SET T e The LFI 3751 determined the current limit is not high enough to reach the desired operating temperature entered in SET T e Correction Increase the current limit or review the design to see why the desired temperature differential cannot be achieved E003 Error 3 Non uniform TE Step Measured e Itis critical that the step current TE remain constant throughout the Autotune parameter measurements for L Rmax and T lf the output current is limited because the compliance voltage of the LFI 3751 has been reached the step current will not be uniform e Correction Reduce the current lim
91. r Offset C1 Display Actual LM335 Temperature Display Setpoint Temperature decrease 9 increase 50 5 Entering Data Point C Rotate the Display Select Switch to C Shift Button ON to display the Offset in mV For the LM335 Offset is 0 mV Rotate the Digi Pot Adjust Knob to change the value Default from the factory sets up for a 0 mV offset A B and C cannot be adjusted while the output is on Data pairs A B and C are saved in non volatile memory RS 232 Command C1 Offset Display Resolution Offset 9 99 to 9 99 mV Displaying Actual LM335 Temperature Rotate the Display Select Switch to ACT T Shift Button OFF to display the LM335 temperature RS 232 Command ACTT Display Resolution 199 9 to 20 0 C 19 99 to 99 99 C 100 0 to 199 9 C Adjusting LM335 Temperature Setpoint Rotate the Display Select Switch to SET T Shift Button OFF Temperature will be displayed To adjust the setpoint rotate the Digi Pot Adjust Knob While the knob is rotating the display will change but the instrument will not control to the new setpoint until the knob stops moving The decimal point will move to display maximum resolution SET T is saved in non volatile memory RS 232 Command SETT Chapter 2 Front Panel Operation Controlling Temperature with an LM35 ACTT SETT TEI o Controlling Temperature with an LM35 TEV LMI AUXT O Key to accurately m
92. r across output e The temperature controller automatically adjusts the sensor bias current to optimize the sensor voltage and also allow a wider temperature operating range You can control the feedback or bias current selection with the Sensor Bias Configuration Command This command also controls the loop polarity NTC or PTC sensor For example the following Command Packet sets the bias current to 10 uA Write 1101241 000 00122 Sets Sensor Bias to manual 10 uA for an NTC sensor e This command is helpful for configuring the instrument for use with non standard temperature sensors e The following table details the structure of the characters in the data field Char 7 Sign Char manual automatic Char6 NTC PTC Sensor 0 Negative Temperature Coefficient Sensor 1 Positive Temperature Coefficient Sensor Char 5 AD590 0 OFF 1 use 10 kQ resistor for feedback Char 4 10 mA 0 OFF 1 use 10 mA bias current Char 3 Decimal Point Char 2 1 mA 0 OFF 1 use 1 mA bias current Char 1 100 uA 0 OFF 1 use 100 uA bias current Char 0 10 uA 0 OFF 1 use 10 uA bias current Chapter 4 Remote Interface Reference Configuring the Sensor When writing the Sensor Bias Configuration command Character 7 or configures the instrument to manual or automatic mode A puts the sensor configuration under manual control A lets the instrument automatically configure the sensor
93. r is ready for use A Verify you have received these items If anything is missing contact Wavelength Electronics or your nearest international distributor L One power cord L 9 pin D Sub receptacle solder cup and metal hood L AC fuses Two each for 115V or 230V operation L 50 Q BNC terminator Analog version only O Certificate of Calibration VI This Users Guide L Benchlink software 3 5 floppy included with this User s Guide B Verify the power line voltage setting The line voltage is set to the proper value for your country when the temperature controller is shipped from the factory The available settings are 115 or 230 VAC If the voltage setting is incorrect change it and check that the correct fuse is installed If fuses are not available locally call the Wavelength Electronics Technical Support Group or your international distributor to order new fuses Remove power cord Change Remove fuse holder assembly switch to proper voltage and verify fuse rating or install proper fuse Remove with D a screwdriver A 2000 maT for 115 V 1000 maT for 230 V 5 x 20 mm SLO BLO C Connect power cord and power on the LFI 3751 Ensure the power source you plug the temperature controller into is properly grounded Once the AC Power Switch on the front panel is pressed in all LEDs on the front panel will light up while the temperature controller performs its power on self test After the test the temperature controll
94. r over a small range of temperatures Several factors cause a thermal load to respond differently from one temperature to another One such factor is a thermoelectric s efficiency which varies depending on the current being pumped through the thermoelectric and the temperature difference between its cold and hot plate At some point a thermoelectric s heatsink temperature raises to a point where it absorbs heat more slowly from the thermoelectric Both these factors affect the maximum temperature versus time slope RF Other factors such as ambient temperature change and power being applied to an active device affect the thermal load s lag time L and time constant T Fortunately PID controllers are relatively robust and still control quite well even if they are not optimized Depending on the size of your load you may find it good practice to perform a PID Autotune each time the LFI 3751 is powered on to compensate for changes in the thermal load AY_o _ 33 This page intentionally left blank 34 ACTT SETT TEI TEV LMI AUXT Cc GEG BOL Default Thermistor Configuration A T 10 00 C R 19 90 kQ B T 25 00 C R 10 00 kQ c T 40 00 C R 5 326 kQ Thermistor A1 A2 B1 B2 C1 C2 Thermistor Voltage pins 5 amp 4 Vi lbas Ry BIAS V Voltage across pins 4 amp 5 las LFI 3751 Bias Current BIAS R Resistance of t
95. r the LM35 Offset is 0 mV Enter Orset C1 e Rotate the Digi Pot Adjust Knob to change the value Default from the factory sets up for a 0 mV offset e A B and C cannot be adjusted while the output is on e Data pairs A B and C are saved in non volatile memory e RS 232 Command C1 Offset Display Resolution Offset 9 99 to 9 99 mV Entering Data Point C 6 Displaying Actual LM35 Temperature e Rotate the Display Select Switch to ACT T Shift Button OFF to display the LM35 temperature e RS 232 Command ACT T Display Actual LM35 Temperature Display Resolution 199 9 to 20 0 C 19 99 to 99 99 C 100 0 to 199 9 C Display Setpoint Temperature 7 Adjusting LM35 Temperatu re Setpoint decrease e Rotate the Display Select Switch to SET T Shift Button OFF Temperature will be displayed increase e To adjust the setpoint rotate the Digi Pot Adjust Knob While the knob is rotating the display will change but the instrument will not control to the new setpoint until the knob stops moving e The decimal point will move to display maximum resolution e SETT is saved in non volatile memory e RS 232 Command SETT 53 This page intentionally left blank 54 Chapter 2 Front Panel Operation Sensor Error Condition Sensor Error Condition Sensor Error Process SENSOR ERROR Zz 4 Sy BEEP 7IN OUTPUT a PRESS OUTPUT ON O BUTTON IS
96. rst send the PASSWORD command You should not use these commands without direct supervision from Wavelength Electronics Technical Support Group Write 110125472222222 FCS PASSWORD Calibrating LIM POSITIVE Slope amp Offset e These commands calibrate the positive limit current settings Write 1101284 001 0002B TE POS LIM I SLOPE CAL 1101285 000 0002B TE POS LIM OFFSET CAL in Amps Calibrating LIM NEGATIVE Slope amp Offset e These commands calibrate the negative limit current settings Write 1101286 001 00029 TE NEG LIM I SLOPE CAL 1101287 000 00029 TE NEG LIM I OFFSET CAL in Amps Reading the Current Calibration Settings e To read the current calibration settings the Command Type changes from a WRITE 2 to a READ 1 and no PASSWORD is required Read 1101 184 000 00029 Reads TE POS LIM I SLOPE CAL 1101185 000 00028 Reads TE POS LIM I OFFSET CAL in Amps 1101186 000 0002B Reads TE NEG LIM I SLOPE CAL 1101187 000 0002A Reads TE NEG LIM I OFFSET CAL in Amps 116 RS 232 Commands Discussed PASSWORD RESTORE FACTORY CALIBRATION DEFAULTS Chapter 4 Remote Interface Reference RESTORE Calibration Defaults RESTORE Calibration Defaults To issue this command you must first send the PASSWORD command You should not use this command without direct supervision from Wavelength Electronics Technical Support Group To revert this instrument back to the default setting
97. s e To display RTD resistance rather than temperature enter 0 000 0 000 for the B terms C terms are ignored for resistance display e A B and C cannot be adjusted while the output is on e Data pairs A B and C are saved in non volatile memory e RS 232 Command B1 T B2 R Display Resolution Temperature 199 9 20 0 C 19 99 2 00 C 1 999 9 999 C 10 00 99 99 C 100 0 199 9 C Resistance 9 999 kQ 99 99 kQ 499 9 KQ Chapter 2 Front Panel Operation Controlling Temperature with RTDs decrease Adjust c increase 6 Entering Data Pair C Enter T C1 e Rotate the Display Select Switch to C Shift Button ON to display the third data pair e Rotate the Digi Pot Adjust Knob to adjust each value as it is displayed e A B and C cannot be adjusted while the outputis on e Data pairs A B and C are saved in non volatile memory e RS 232 Command C1 T C2 R Display Resolution Temperature 199 9 20 0 C 19 99 2 00 C 1 999 9 999 C 10 00 99 99 C 100 0 199 9 C Resistance 9 999 kQ 99 99 kQ 499 9 kQ 7 Displaying Actual RTD Temperature e Rotate the Display Select Switch to ACT T Shift Button OFF to display the RTD temperature e RS 232 Command ACT T Display Resolution 199 9 to 20 0 C 19 99 to 99 99 C 100 0 to 199 9 C 8 Displaying Actual RTD Resistance e Enter 1 000 1 000 for A and 0 000 0 000 for B to have the LFI
98. s send the following Command Packets Write 110125472222222 FCS PASSWORD 1101288 000 00026 RESTORE FACTORY CALIBRATION DEFAULTS NOTICE This command will clear the calibration E7PROM and clear any previous calibration values All slopes will reset to 1 and offsets to 0 The sensor bias currents will become 10 uA 100 uA 1 mA and 10 mA The AD590 sense resistance returns to 10 kQ The serial number will revert to CALLWE 117 Chapter 4 Remote Interface Reference Diagnostic Lamp Control Diagnostic Lamp Control RS 232 e The LAMP CONTROL command tests whether the LEDs or 7 segment Commands Discussed displays are properly operating LAMP CONTROL Six test states are provided The following table details the structure of the characters in the data field Only one test state is allowed per Command Packet For example you can turn on the 7 Segment Display with one Command Packet and the Status LEDs with a second Command Packet Char 7 Sign Char manual automatic Char 6 Sequence Lamps Sound Beeper 0 OFF 1 Lamp ON Char 5 All Lamps On 0 OFF 1 Lamp ON Char 4 7 Segment Displays 0 OFF 1 Lamp ON Char 3 Decimal Point Char 2 Unit of Measure amp Shift LEDs 0 OFF 1 Lamp ON Char 1 Status LEDs 0 OFF 1 Lamp ON Char 0 Output ON LED 0 OFF 1 Lamp ON e For example to turn on an instrument s Unit of Measure amp Shift LEDs
99. s in the data field Char 7 Sign Char always Char 6 Sensor Open Error 0 OK 1 Error Char 5 Sensor Short Error 0 OK 1 Error Char 4 Low Temperature Limit 0 OK 1 Error Char 3 Decimal Point Char 2 High Temperature Limit 0 OK 1 Error Char 1 Current Limit 0 OK 1 Error Char 0 Output Current ON OFF status 0 OFF 1 ON 105 Commands Discussed 106 RS 232 HALT PROCESSOR Chapter 4 Remote Interface Reference Halting the Processor Halting the Processor e The HALT PROCESSOR command turns all front panel lamps off disables interrupts shuts off all timers clocks and the watchdog then freezes the CPU To stop the processor on the instrument send the following Command Packet Write 1101 252 000 00021 Halts Processor e You have to power off the instrument for 30 seconds before resuming operation e No Response Packet is returned when this command is executed Chapter 4 Remote Interface Reference Reverting to LOCAL Mode Reverting to LOCAL Mode RS 232 e To switch from computer to front panel control of the instrument use Commands Discussed the LOCAL command To revert to LOCAL mode send the following Command Packet LOCAL Write 1101253 000 00020 LOCAL e Before reverting to LOCAL mode the instrument will return a Response Packet 107 Chapter 4 Remote Interface Reference Entering the PASSWORD Entering the PASSWORD R
100. seesseeeneeeeseesneeeeeeeeeeees 67 Chapter 3 Rear Panel Operation ccssseeeceesseeeeeesseeeeessseeeeeeseneeeeees 69 Connector PIN OUtS 2c2ccii 2scncecccssccceadesaccnsseszeceenaiesaddseaesszescoctancetencesdeesestestaeteatessucesenesescecteess 71 BNC COnMOCHOM witiiccs cscicecctei cca ceca ei cee cect ct suona snau venosa aduson aa ravarai anabi ioari Naane 73 IC oT T E E A E E A EE T 74 U9 U04 JO a qeL Chapter 4 Remote Interface Reference s ccccsseseeeesssseeeeeessneeeeeeneeneees 75 RS 232 Interface Configurations ci c cccccesceccecceccesssscesteccctccsecwentuevetisincdsctecscteconeescitesseeancees 77 RS 232 Command and Response Packet Formats csseceessseseeeseeeeeeeeeeeeeeeeneeeeeneee 80 Standard Command Code Listing ccesccsseccseeseeeeeeeeeseeeeseeeeneeneeeeseesseeesseeseneaeeneneeeeeee 82 Calibration Command Code Listing ccseecceecesseeeeeeeeseeeneeeeeeeeneeeeeneeseeesseeseeeseeeeneeeneee 85 Diagnostic Command Code LiSting ccceecsecesseeeeeeseeeeseeeeseeenseesseeseeeeeeeeeeeeaseneenseeeeeees 86 End Code Listing ai cccccccciccctscacssececcciecscecanescnseeanccesces sscesiueccnieseanesaneesanessaessecessteecusuesenecscnececess 87 Starting RS 232 Communication with the LFI 3751 cccssceseseeeeeeeseeeseeeeeeeeseeeneeneeee 89 Configuring the Sensor ai icaccscecestccecs epee ceecestecsaueciten canes stcseaci saaki state scnescteessevenstestaessteetecnecees 90 M
101. sensor bias current in uA 100 uA BIAS CAL Enter actual 100 uA sensor bias current yA 1 mA BIAS CAL Enter actual 1 mA sensor bias current in mA 10 mA BIAS CAL Enter actual 10 mA sensor bias current in mA AD590 10 kQ CAL Enter actual 10 kQ resistance for sensing AD590 current in kQ RAW ACT T VOLT Measure uncalibrated ACT T voltage in Volts RAW TE VOLT Measure uncalibrated TE voltage in Volts RAW TE V VOLT Measure uncalibrated TE V voltage in Volts ACT T SLOPE CAL Calibrate ACT T slope ACT T OFFSET CAL Calibrate ACT T offset TE SLOPE CAL Calibrate TE slope TE OFFSET CAL Calibrate TE offset TE V SLOPE CAL Calibrate TE V slope TE V OFFSET CAL Calibrate TE V offset POS SET T SLOPE CAL Calibrate positive SET T slope POS SET T OFFSET CAL Calibrate positive SET T offset NEG SET T SLOPE CAL Calibrate negative SET T slope NET SET T OFFSET CAL Calibrate negative SET T offset TE POS LIM SLOPE CAL Calibrate LIM POSITIVE slope E POS LIM OFFSET CALI Calibrate LIM POSITIVE offset TE NEG LIM SLOPE CAL Calibrate LIM NEGATIVE slope E NEG LIM OFFSET CA Calibrate LIM NEGATIVE offset RESTORE FACTORY Resets the calibration constants to factory defaults CALIBRATION DEFAULTS 85 Chapter 4 Remote Interface Reference Diagnostic Command Code Listing Diagnostic Command Code Listing Command Command Command Type Code Description and Data Field Range LAMP CONTROL Turns Front Panel Lamps on and off Char 7 Sign Char manual
102. st two data pairs alternate on the display One is temperature C LED lit the other is the corresponding thermistor resistance kQ LED lit e Rotate the Digi Pot Adjust Knob to change the value displayed Default from the factory sets up for a 10 kQ thermistor Wavelength part number TCS 610 e To display thermistor resistance rather than temperature enter 0 000 0 000 for the A terms B amp C are ignored for resistance display e A B and C cannot be adjusted while the output is on e Data pairs A B and C are saved in non volatile memory e RS 232 Command A1 T A2 R Display Resolution 20 0 C 19 99 2 00 C 1 999 9199916 10 00 99 99 C 100 0 199 9 C 9 999 kQ Temperature 199 9 Resistance 99 99 kQ 499 9 kQ Chapter 2 Front Panel Operation Controlling Temperature with Thermistors decrease Adjust B oS mcrease 5 Entering Data Pair B Enter T B1 e Rotate the Display Select Switch to B Shift Button ON to display the second data pair e Rotate the Digi Pot Adjust Knob to adjust each value as it is displayed A B and C cannot be adjusted while the outputis on e Data pairs A B and C are saved in non volatile memory e RS 232 Command B1 T B2 R Display Resolution Temperature 199 9 20 0 C 19 99 2 00 C 1 999 9 999 C 10 00 99 99 C 100 0 199 9 C Resistance 9 999 kQ 99 99 kQ 499 9 kQ decrease Adjust C increase 6 Entering Data Pair C Enter
103. t temperature the Command Type changes from a WRITE 2 to a READ 1 Read 1101103 000 00026 Reads SET T in C e Temperature Setpoint ranges from 199 900 to 199 900 C 99 Chapter 4 Remote Interface Reference Setting Resistance Setpoint Setting Resistance Setpoint RS 232 e To use resistance as the setpoint you must be using a resistive sensor Commands Discussed thermistor or RTD The following table shows the configuration settings and Command Packets to set the configuration for a thermistor or RTD A in resistance mode B1 B2 SET R How to Configure Thermistor and RTD for Resistance Setpoint Configuration Sensor Type Setting Command Packet Write Thermistor 1101221 000 00025 1101222 000 00026 RTD 1101221 001 00024 1101222 001 00027 1101223 000 00027 1101224 000 00020 e For example after the sensor is properly configured send the following Command Packet to configure the instrument with a resistance setpoint of 10 kQ Write 1101204 010 00023 Sets SET R in kQ e To read the instrument s setpoint resistance the Command Type changes from a WRITE 2 to a READ 1 Read 11011044000 00021 Reads SET R in kQ e Resistance Setpoint ranges from 000 000 to 499 900 KQ 100 Chapter 4 Remote Interface Reference Enabling and Disabling the Output Current Enabling and Disabling the Output Current RS 232 For complete detail about Enabling the Output Current see Chapter 2 Commands
104. tS or Autd AutS Setpoint Response Autotune Optimization Autd Disturbance Rejection Autotune Optimization You determine what kind of control loop the Autotune will use based on your settings for the and D terms If set to zero that control term will not be used The following chart shows which control modes are available and the appropriate and D settings Rotate the Display Select Switch to then D making any necessary adjustments with the Digi Pot Adjust Knob Control Mode 1 D non zero non zero non zero OFF zero OFF zero non zero OFF zero OFF zero For this example adjust P to AutS I to 1 0 and D to 1 0 Manual setting Adjust P to a value other than AutS or Autd 7 Enable the Output Current Press the Output Button to enable the output current and begin the Autotune optimization sequence The ON LED indicator will flash while Autotune optimization is in progress Once the Autotune sequence is finished the LFI 3751 will control to the desired operating temperature entered in Step 5 Refer to Chapter 2 Autotune PID operation for more detail 8 Measure Actual Temperature Rotate the Display Select Switch to ACT T Shift Button OFF to monitor the load temperature ACT T temperature now approaches the SET T temperature LE Measure Thermoelectric Current and Voltage Rotate the Display Select Switch to TE Shift Button OFF to monitor the current flowing through the thermoelectric Rotate the Display Sele
105. te Interface Reference RS 232 Interface Configuration 2 Connections between instruments LFI 3751 First Unit DB 25 to DB 25 RS 232 RS 232 Output Wavelength Cable LFI 3751 Second Unit Connector CRS 802 2 feet RS 232 Input Connector 1 Peripheral Transmit Out 2 Instrument Receive In Peripheral Receive In 3 Instrument Transmit Out 4 5 6 Signal Ground 7 Signal Ground 8 20 D Sub SHELL SH D Sub SHELL DB 25 DB 25 DB 25 DB 25 Male Female Male Female D Sub Shell on LFI 3751 is connected to chassis Always properly earth ground the LFI 3751 chassis through your AC power system 3 Controlling Multiple Instruments via RS 232 DB 9 To Host Computer D or DB 25 3 D a oo n o 4 RS 232 Connector Pinouts RS 232 Input RS 232 Output 25 pin female D sub receptacle 25 pin male D sub plug ON 0000000000000 O x 000000000000 A 2 Instrument Receive In 2 Peripheral Transmit Out 3 Instrument Transmit Out 3 Peripheral Receive In 7 Signal Ground 7 Signal Ground 5 6 8 amp 20 shorted Chapter 4 Remote Interface Reference RS 232
106. temperature equal to the setpoint temperature Some thermal loads oscillate around the setpoint temperature This oscillation is referred to as thermal cycling Thermal cycling can occur if the proportional gain is greater than the system s critical proportional gain or more commonly too small an integrator time constant has been set to compensate for the thermal load s lag time L A small integrator time constant charges more quickly than a larger integrator time constant If L is significantly larger than the integrator time constant then the integrator will force the output current to shoot past the setpoint temperature since the temperature sensor is lagging behind the thermal load s actual temperature Chapter 2 Front Panel Operation Theory of Autotune PID The sensor temperature eventually overshoots the setpoint temperature forcing the integrator to charge in the opposite direction reversing the output current The thermal load s lag causes an overshoot in this direction also and the cycle simply repeats itself A large enough integrator time constant can be set to compensate for a thermal load s lag time by charging slowly enough to not over drive the output current Commonly temperature controllers will exhibit a damped oscillation when settling to temperature This occurs because the integrator is set large enough to compensate for the thermal load s lag time but small enough that the integrator must overshoot sever
107. the instrument for 115 or 230 VAC operation Before connecting power to your instrument check the Voltage Select Switch for proper AC voltage in your country Only use the power cord supplied with your instrument Do not change the setting of this switch while power is supplied to the instrument See the table below for the proper AC Voltage selection AC Voltage Available Voltage Select 98 133 VAC 16V 196 265 VAC 230 V 3 AC Fuse For 115 VAC operation install a 2000 maT fuse 5 x 20 mm SLO BLO fuse For 230 VAC operation install a 1000 maT fuse 5 x 20 mm SLO BLO fuse 4 Earth Ground Connection If your AC power system does not bring earth ground through the AC Power Entry Module then connect earth ground via a 16 AWG wire to this screw terminal 74 Chapter 4 Remote Interface Reference 75 76 Chapter 4 Remote Interface Reference Remote Interface Reference This chapter details the RS 232 hardware command and response packet structure and how to use each command Command codes and error codes are also listed All example command strings assume the instrument s RS 232 address is 01 Chapter 4 Remote Interface Reference RS 232 Interface Configuration RS 232 Interface Configuration You connect an LFI 3751 to the RS 232 interface using the 25 pin D sub serial connector DB 25 on the rear panel RS 232 Input Connector You can add up to 98 more LFI 3751s by connecting the RS 232 Output
108. tors meet the RS 232C standard for wiring See Chapter 4 for oe000000000000 a 0000000000005 detailed RS 232 commands Some computers may require a null modem for proper operation Check your computer s RS 232 port for proper wiring 2 Peripheral Transmit before connecting to the instrument 3 Peripheral Receive 7 Signal Ground RS 232 Output The RS 232 output connects to another Wavelength Electronics RS 232 Input instrument with addressable RS 232 interface The RS 232 OUTPUT 25 pin female D sub receptacle always connects to the other instrument s RS 232 INPUT connector Up to 99 instruments can be daisy chained together and controlled from one RS 232 port on a computer 2 Instrument Receive In RS 232 Input 3 Instrument Transmit Out 7 Signal Ground 5 6 8 amp 20 shorted The RS 232 input can be connected to any RS 232 port on a computer The proper configuration of the computer s RS 232 port is 8 N 1 8 bits no parity 1 stop bit 3 Controlling Multiple Instruments via RS 232 DB 9 F To Host oS o gt Computer lt gt Ce Ces J Tele A or DB 25 gd ASR ho fao no RS 232 Connector Unit 1 Unit 2 Unit 3 Unit
109. und the setpoint temperature then reduce the proportional gain Proportional Gain Range Auto Setpoint AutS Auto Disturbance Autd OFF 0 0 ON 0 1 to 100 Chapter 2 Front Panel Operation Setting the P I and D Constants 2 Adjusting the Term Rotate the Display Select Switch to Shift Button ON Rotate the Digi Pot Adjust Knob to change the displayed value RS 232 Command I Increasing the integrator time constant will improve the instrument s control loop stability especially with large thermal loads Increasing the integrator too much produces a sluggish response and long settling times If you notice the temperature of your load slowly approaching the setpoint temperature then reduce the integrator time constant Reducing the integrator too much can cause thermal cycling Integral Time Constant Range OFF 0 0 ON 0 4 to 10 seconds Display Integral Time Constant o Adjusting the D Term Rotate the Display Select Switch to D Shift Button ON Rotate the Digi Pot Adjust Knob to change the displayed value RS 232 Commana D Increasing the differentiator time constant also improves the instrument s control loop stability The differentiator term is typically only useful or necessary for large hard to control thermal loads The differentiator term can amplify electrical noise from the sensor If you notice the temperature of your load quickly cycling then reduce the differentiator time constant D
110. uniform TE step measured 4 Rate Sign Change Char 4 Autotune Status 0 Normal 1 Autotune Char 3 Decimal Point Char 2 Temp Limit or Error Limit Status 1 requires clearing Char 1 Integrator Status 0 OFF 1 ON Char 0 Output Status 0 OFF 1 ON Chapter 4 Remote Interface Reference Standard Command Code Listing Command Command Command Type Code Description and Data Field Range HALT Turns all lamps off disables interrupts and shuts off all timers PROCESSOR clocks and watchdog then freezes the CPU Remove power to reset unit LOCAL Restore to local operation Returns Response Packet as last act PASSWORD Factory set password to access calibration and diagnostics mode Read the current state of password flag in Char 0 0 PASSWORD not issued 1 PASSWORD properly issued SERIAL 2 Enter or read unit serial number PASSWORD required to enter NUMBER serial number FIRMWARE Read firmware version VERSION MODEL NO Read Model Number 2 These Command and Response Packets violate the XXX XXX data format The data field is used for eight ASCII characters XXXXXXXX No other commands violate the standard data format 84 Chapter 4 Remote Interface Reference Calibration Command Code Listing Calibration Command Code Listing e All WRITE Command Packets are PASSWORD protected Command Command Command Type Code Description amp Data Field Range 10 uA BIAS CAL Enter actual 10 uA
111. ust be set depending on the type of sensor you re using A1 A2 B1 B2 C1 and C2 B2 and C2 are used for thermistors and RTDs only For example to configure a thermistor three Temperature Resistance data pairs are entered to establish how the thermistor resistance changes with temperature Six Command Packets are sent to configure these values The following packets configure the instrument for a TCS 610 10 KQ thermistor operating around 25 C The three configuration data pairs are 10 C 19 9 KQ 25 C 10 KQ and 40 C 5 326 KQ Write 1101 221 010 00024 Sets A1 1101222 019 90027 Sets A2 1101223 025 00020 Sets B1 1101224 010 00021 Sets B2 1101225 040 00025 Sets C1 1101226 005 32620 Sets C2 The table on the next page details the Command Codes and expected data for all the sensors supported by the LFI 3751 To read the current sensor configuration the Command Type changes from a WRITE 2 to a READ 1 Read 1101121 000 00026 Reads A1 1101122 000 00025 Reads A2 1101123 000 00024 Reads B1 1101124 000 00023 Reads B2 1101125 000 00022 Reads C1 1101126 000 00021 Reads C2 90 Chapter 4 Remote Interface Reference Configuring the Sensor Command Codes and Expected Data to Configure Supported Sensors Sensor Type RS 232 Command Command Code Data Description Data Range Thermistor Temperature 1 199 900 to 199 900 C Resistance 1 000 000 to
112. xperiences significant power or heat transients such as those found in pulsed laser diode applications When a system is optimized for Disturbance Rejection it is not optimized for Setpoint Response and vice versa More simply a thermal load that is optimized to reject disturbances will often overshoot and ring when changing from one setpoint temperature to the next NOTE Sometimes thermal loads behave in a manner referred to as a non minimum phase system or more simply the initial response of the system is to move in the opposite direction of the desired temperature change This effect is caused by a zero in the right hand plane of the thermal system When the LFI 3751 performs a Setpoint Response Autotune it assumes the thermal load is a single pole system The right hand plane zero is not compensated for and the load temperature will still overshoot In most cases where the thermal load exhibits this behavior the Autotune removes the majority of the overshoot and still improves the settling time performance If your thermal load exhibits a non minimum phase response do not optimize with Disturbance Rejection Autotuning 25 Chapter 2 Front Panel Operation Autotune PID Operation ad Configure LFI 3751 for Autotune decrease gt Setpoint Response Tuning E increase e Rotate the Display Select Switch to P Shift Button ON e While the output current is disabled rotate the Digi Pot Adjust Knob Proportion
113. y LED is OFF LED is lit SOLID LED FLASHES Adjusting Temperature Limits Note Temperature Limit does not operate in Resistance Mode for thermistors or RTDs Adjusting Limit Current Positive LIM I IOON Rotate the Display Select Switch to LIM I Positive Limit Current 0 to 5 Amps will alternate with the Negative Limit Current 5 to 0 Amps TEMP LIMIT 0 Press amp Release T LIMIT S Paa TEMP LIMIT 1 350 Front Panel Operations at a Glance Limit Current LED LIMIT I N17 Cal 7IN LIMIT LED flashes TE Current is limited by LIM settings WAIT Most thermal loads require maximum current while initially controlling to temperature To control properly the output current must be less than the LIM I current setting CAUTION Improperly set LIM I can damage your thermoelectric 199 9 to 199 9 C TEMP LIMIT 2 Cycles three times then reverts to prior display Temperature Limit LED amp Correcting the Temperature Limit Error Press Output Button to T LIMIT NIZ La ZIN T LIMIT LED flashes Sensor temperature is outside temperature limits Output is disabled pe BEEP ye clear error OUTPUT o Oo O OVER UNDER TEMPERATURE CONDITION CORRECTED S peeps lt Tee LONG BEEP Press Output Button to re enable output current OUTPUT ia OVER UNDER TEMPE
114. ysteresis is designed in to produce bumpless operation when switching from one bias current to another Bias Current and Sensor Resistance Sensor Current Resistance Range 10 uA 25kQ to 500 kQ 100 uA 2 5kQ to 45kQ 1mA 0 25kQ to 4 5kQ 10 mA 0kQ to 0 45 kQ Chapter 2 Front Panel Operation Controlling Temperature with Thermistors Steinhart Hart Equation L 4 x IN R 7 I R T Temperature Kelvin R Resistance Ohms Typical Thermistor R vs T response Resistance kQ T1 R1 15 T2 R2 10 T3 R3 0 10 20 30 40 50 Temperature C decrease N increase Adjust A Enter T A1 3 Thermistor Temperature vs Resistance Temperature can be determined by the Steinhart Hart equation given the thermistor resistance and the equation coefficients Xo Xo and X To calculate the Steinhart Hart coefficients the LFI 3751 needs three Temperature Resistance data pairs Enter A T R B T R and C T R through the front panel or A1 A2 B1 B2 C1 and C2 via the RS 232 interface Using the thermistor resistance vs temperature chart provided with your thermistor select three temperatures These temperatures can be far apart if you re working with a wide temperature range or close together to optimize the curve fit around one temperature 4 Entering Data Pair A e Rotate the Display Select Switch to A Shift Button ON The fir

LFI-3751 Product Data Sheet

Contents

Download Pdf Manuals

Related Search

Related Contents