Love Series 4C, 8C, & 16C Temperature
Contents
1. SE SEE ss 19 Specifications ce eee eas 20 Input Sensor RangeS 0 00 cee ee eee 21 PECCAUUONS ve us UR ce NE EES eee SR OD Kee wee oS oe 22 External Dimensions 0 00 cee eee 23 Page 2 MODEL NUMBER IDENTIFICATION AC 06 166 OUTPUT 1 OUTPUT 1 OUTPUT 1 2 Voltage Pulse 2 Voltage Pulse 2 Voltage Pulse 3 Relay 3 Relay 3 Relay 5 Current 5 Current 5 Current 6 Linear Voltage 6 Linear Voltage 6 Linear Voltage GETTING STARTED 1 Install the control as described on page 4 2 Wire your control following the instructions on page 6 Please read the Precautions section located at the end of this manual before wiring the control 3 For best results when programming changes are necessary make all changes to the Initial Setting mode Pages 13 14 before making changes to the Regulation Mode Pages 11 12 or Operation Mode Pages 10 If any error messages occur check the Diagnostic Error Message Section Page 18 for assistance Page 3 INSTALLATION Mount the instrument in a location that will not be subject to excessive temperature shock or vibration All models are designed for mounting in an enclosed panel Select the position desired for the instrument on the panel Prepare the panel by cutting and deburring the required opening per the panel cut out dimensions listed below Follow the mounting instructions listed on page 5 Lastly wire the controller per the appr2. the controller switches to the Regulation Mode If held for more than 3 seconds during the Operation Mode the controller switches to the Initial Setting Mode If pressed during the Regulation Mode or Initial Setting Mode the controller will return to the Operation Mode SECURITY FEATURES The C series controller has two built in security lock settings to prevent unauthorized personnel from changing parameter settings These parameters are set in the Operation Mode The LoC1 setting affects all parameters in the controller If LoC1 setting is enabled the operator will have to unlock the controller to make any changes to the controller s parameters The LoC2 setting affects all parameters except the set point If LoC2 setting is enabled the only parameter that the operator will be able to change is the set point In order to change any other parameters the operator will have to unlock the control before making a change In order to unlock the control the operator must depress the ENTER and INDEX key simultaneously Page 7 CONTROL OPERATION DESCRIPTION The HOME display is the normal display while the control is operating If no errors or functions are active the HOME display will indicate the Process Variable that is being measured on the top display and the Set Variable on the bottom display Error Messages are shown on page 18 Heating or Cooling Temperature Control can be achieved by either heating or cooling Please refer
3. AL H SV AL L Deviation upper limit Deviation lower limit This alarm output operates when PV value is lower than th setting value SV AL L i Absolute value upper and lower limit This alarm output operates when PV value is higher than the setting value AL H or lower than the setting value AL L Absolute value upper limit This alarm output operates when PV value is higher than the setting value AL H Absolute value lower limit This alarm output operates when PV value is lower than the setting value AL L Deviation upper and lower limit with standby sequence This alarm output operates when PV value reaches set poi tae SV value and the value is higher than the setting value SV ALT e SV AL H or lower than the setting Deviation upper limit with standby sequence This alarm output operates when PV value reaches set poi ts SV value and the reached value is higher than the w setting value SV AL H Deviation lower limit with standby sequence This alarm output operates when PV value reaches the set kr n point SV value and the reached value is lower than the pialti F setting value SV AL L Hysteresis upper limit alarm output g This alarm output operates if PV value is higher than the i n SV AL H setting value SV AL H This alarm output is OFF when PV value is lower than the setting value SV AL L Hysteresis lower limit alarm output This alarm output operates if PV value is lower t
4. Bulletin E 90 CPC Series 4C 8C and 16C Microprocessor Based Temperature Process Control Ay c i HEP M M dQ QY LOYE Specifications Installation and Operating Instructions LOVE CONTROLS DIVISION DWYER INSTRUMENTS INC P O BOX 338 MICHIGAN CITY INDIANA 46360 U S A Phone 219 879 8000 www love controls com Fax 219 872 9057 e mail love love controls com TABLE OF CONTENTS Model Number Identification EES ESE ESE SS ESE 3 Getting Started nanana aana ES eee 3 Va siel ss RE do aot E w 4 Panel Cutout Dimensions 0 0000 4 Vleis ee rcm 5 Wiring Diagrams ROET SE EER EE EE ee E ea 6 Front Panel Key Functions SES SE SE SE SES Se ee ee T Security Features iu us nanana naea a EE oe REDE EE 7 Control Operation Description 0 0000 cee eee 8 Programming and Operation for PID Function 9 Description of Menu Structure ss SE ss Es eee 10 Operation MeNDU EES SE SE Ee ee ee ees 10 Regulation MenU ss EE SE EE SEE EE eee eee 11 12 Initial Setting Menu ESE ES SE ESE ee 13 14 Alarm Output Description llle 15 Communication Register List SE SESSE SES eee eee 16 Communication Protocol SESSE eee ss 17 Diagnostic Error Messages ss ss eee eee 18 Reset Factory Default Setting
5. Cooling control Selection Heating 0 default Cooling 1 4719H GControl Run Stop setting Run Stop n EMS ET N Run 1 default Stop 0 Communication write in disabled 0 default Communication write in enabled 1 OE 0 defui ON 0 default ON 1 Normal operation No error operation No error Initial process Initial status Temperature is not stable Temperature sensor is not connected 472BH R Code 4 Temperature sensor input error Code 5 Measured temperature value exceeds the temperature range Code 6 Code 7 Note R means read only value oe Oo cx Page 16 Communication Protocol Command code to read N words O3H The maximum value of N is 3 For example in order to read two words from controller 01 address 01H at starting data address 4700H the command in ASCII mode is ASCII mode Command message Response message Number of data 0 count by byte address 4700H Fo LRC check LRC check is the added sum from Address to Data content For example 01H 03H 47H OOH OOH 02H 4DH then take the complementary of 2 B3H Command code to write 1 word O6H For example in order to write 1000 O3E8H in controller 01 comm address 01H at starting data address 4701H the command is ASCII mode is ASCII mode Command message Response message DIAGNOSTIC ERROR MESSAGES Display Error Messages Ter Description Action Reguired b150 D
6. D On Off or Manual Page 13 Heat Cool Selection Assigns output 1 to be either heat or cool HEAt Output 1 Heating CooL Output 1 Cooling Alarm 1 Setting Sets operation for Alarm 1 Please see selection on Alarm Outputs for description of the outputs Alarm 2 Setting Sets operation for Alarm 2 Please see selection on Alarm Outputs for description of the outputs Communications Write Function Feature Allows parameters to be changed via the RS 485 communications Setting to OFF prevents any changes from remote users Controller Address Set from 1 to 247 This value must match the controller address used by the host computer Baud Rate Setting This value must match the communication baud rate of the host computer Communication Data Length Choose either 7 or 8 This value must match the communication data length of the host computer Communication Parity Bit Set this value to even odd or none This value must match the communication parity bit of the host computer Communication Stop Bit Set this value to 1 or 2 This value must match the communication stop bit of the host computer Page 14 Alarm Output Configuration and Operation Table Set Value Alarm Output Operation Alarm function disabled Output is OFF Deviation upper and lower limit ON _ ET a This alarm output operates when PV value is higher than amp FF the setting value SV AL H or lower than the setting value SV AL L SV SV
7. Rated 250 V 15 Amps max A suitable disconnecting device should be provided near the controller in the end use installation Page 22 External Dimensions Dimensions are in millimeter inch 44 0 mm P 1 73 in gage Ly J Kk Sea 2 a9 WI M MEE TE FU TR EX T T D 91 omm T L l 3 58 inj i M 44 5 mm _ 1 75 in b B Fi l Ec EZ E of 5 TS LE ao E E 8 en e m nal CI z z 3 78 in e 0 82 in i 3 12 in A e e 2 e 79 2 mm 3 12 d sa 8C t EE e we t sT E UB Il Ee I oe N ai l Bin Page 23 Copyright 2014 Dwyer Instruments Inc Printed in U S A 7 14 FR R0 443601 20 Rev 4 LOVE CONTROLS DIVISION DWYER INSTRUMENTS INC Phone 219 879 8000 wane love CODO com P O BOX 338 MICHIGAN CITY INDIANA 46360 U S A Fax 219 872 9057 e mail love love controls com
8. couple types when extending or connecting the thermocouple wires Please use wires with resistance when extending or connecting a platinum resistance sensor RTD Please keep the wire as short as possible when wiring a platinum resistance sensor RTD to the controller and please route power wires as far as possible from load wires to prevent interference and induce noise This controller is an open type unit and must be placed in an enclosure away from high temperature humidity dripping water corrosive materials airborne dust and electric shock or vibration Please make sure power cables and signals from instruments are all installed properly before energizing the controller otherwise serious damage may occur Please do not use acid or alkaline liquids for cleaning Please use a soft dry cloth to clean the controller Wait at least one minute after power is disconnected to allow capacitors to discharge and please do not touch any internal circuit within this period This instrument is not furnished with a power switch or fuse Therefore if a fuse or power switch is required install the protection close to the instrument Recommended fuse rating Rated voltage 250 V Rated current 1 A Fuse type Time lag fuse Note This controller does not provide overcurrent protection Use of the product requires that suitable overcurrent protection device s must be added to ensure compliance with all relevant electrical standards and codes
9. ed in the bottom display on the Home Display The UP and DOWN arrows change the values of the parameters The ENTER key must be pressed after any changes I dur Adjust the set point value Can be any numerical value between the upper and lower limit of the temperature range em l Ly ae 7723 Select Run Stop Output Control Activates outputs De activates outputs M an ce an m m Du yemas ri Alarm 1 High Set Point May not appear depending on ALA1 setting in Initial Setting Menu L Alarm 1 Low Set Point May not appear depending on ALA1 setting in Initial Setting Menu c n Alarm 2 High Set Point May not appear depending on ALA2 setting in Initial Setting Menu LCL Alarm 2 Low Set Point May not appear depending on ALA2 setting in Initial Setting Menu LOL Set front panel security lock A Lock all settings LLE Lock all settings except the set point i Display the output value for output 1 In manual mode this value can be changed using the up and down arrows Page 10 REGULATION MENU Press the ENTER key while at the Home Display in order to access the Regulation Menu Pressing the INDEX key will cycle through the below menu items The parameter will be displayed in the top display while its value will be displayed in the bottom display The UP and DOWN arrows change the values of the parameters The ENTER key must be pressed after any changes or Fi Auto Tune The contro
10. h the set point because it needs time to accumulate the error This parameter defines the default output level on start up When the integral time is set at 0 then the proportional derivative offset correction PdoF would replace the integral deviation offset correction but serves the same function Program Set Up In order to use the PID function in the C series controllers the Control Mode will have to be set to PID in the Initial Setting Menu After changing the Control Mode the PID parameters can be accessed in the Regulation Menu The PID parameters can either be programmed manually or they can be set by the controller using the auto tune function The auto tune will use trial and error to tune the PID parameters to give the control the most precise control Since the time to accurately tune the control may differ depending on the process the controller can also be manually tuned to known PID values prior to running auto tune The Run Stop parameter must be set to run in order to start auto tuning Page 9 DESCRIPTION OF MENU STRUCTURE The programming for the controller is broken down into three menus Operation Regulation and Initial Setting Upon normal operation control will be in the Operation Menu OPERATION MENU Pressing the INDEX key will cycle through the below menu items The parameter will be displayed in the top display while its value will be displayed in the bottom display except for the set point which is display
11. han the i t setting value SV AL H This alarm output is OFF when il EA PV value is higher than the setting value SV AL L Note AL H and AL L include AL1H AL2H AL3H and AL1L AL2L AL3L 1 2 3 4 5 T 10 11 12 Page 15 Communication Register List Communication Parameters List Controller offers a RS 485 port for serial communication Supporting transmission speed 2400 4800 9600 19200 38400 bps Communication protocol Modbus ASCII Non supported formats 7 N 1 or 8 O 2 or 8 E 2 Available communication address 1 to 255 0 is broadcast address Function code 03H to read the contents of register Max 3 words O6H to write 1 one word into register Explanation 4700H R Process value PV Measuring unit is 0 1 updated one time in 0 5 second Unit is 0 1 oC or oF 4703H Lowerlimittalarm 4 groth UPPER the temperature range The data content should not be lower than the temperature range 4710H Input temperature sensor type Please refer to the contents of the Temperature Sensor Type and Temperature Range for detail 0 PID default 1 ON OFF 2 manual tuning 1 to 99 second offset error value 999 999 unit 0 1 4715H Alarm 1 type Please refer to the contents of the Alarm Outputs for detail 4716H Alarm 2 type Please refer to the contents of the Alarm Outputs for detail 4717H Temperature unit display selection oC 1 default oF 0 4718H Heating
12. ications itr Heating Control Cycle Setting Defines the duration for one output period or cycle for output 1 Only available when control mode is set to PID and Output 1 is set for heating ad Cooling Control Cycle Setting Defines the duration for one output period or cycle for output 1 Only available when control mode is set to PID and Output 1 is set for cooling VEN Process Temperature Offset This feature allows the input value to be changed to agree with an external reference or to compensate for sensor error Len Analog Output High Limit Sets the actual upper limit of the analog output when the control s output is operating at 100 Only available for analog output models rio Analog Output Low Limit Sets the actual lower limit of the analog output when the control s output is operating at 0 Only available for analog output models Page 12 INITIAL SETTING MENU Press and hold the ENTER key for at least 3 seconds while at the Home Display in order to access the Initial Setting Menu Pressing the INDEX key will cycle through the below menu items The parameter will be displayed in the top display while its value will be displayed in the bottom display The UP and DOWN arrows change the values of the parameters The ENTER key must be pressed after any changes c Input Selection Select one of the following input types from the below table Thermocouple TXK type ttt 328 1440 F 200 800 C Thermocouple U t
13. isplay on Start Up No Action Reguired No Input Probe Connection Verify that sensor is wired to proper terminals Next check that the controller is programmed for the correct input type Most commonly seen when controller is programmed for a RTD while a thermocouple is connected Input Error Verify that the input is wired to the proper terminals Next check to see if the input type is set to the proper value Most commonly seen when controller is programmed for a 4 to 20 mA input and 0 to 20 mA signal is wired to the controller Process Value Flashes Input signals may normally go above or when outside of range below range limits If not check input and correct the process temperature or increase temperature range limits using tP H and tP L PV Err Error EEPROM Attempt to reset the factory default settings using the instructions in the next section If still has error call customer service for a return goods authorization number to have the controller evaluated at the factory Communication Error Messages RR Ho NN 102EH 4750H 1000H 4700H PV Unstable Re initialize no temperature at this time Input sensor did not connect Input Signal Error Over Input Range ADC fail EEPROM read write error Page 18 Reset Factory Default Settings Note Resetting Factory Default Settings erases all of the values entered by the user Record any necessary settings before proceeding Warning Erasing the user entered values may re
14. isplayl Temperature Range Thermocouple TXK type ttt 328 1440 F 200 800 C Thermocouple U type 0 328 932 F 200 500 C Thermocouple L type L 328 1562 F 200 850 C Thermocouple B type b 212 3272F 100 1800 C Thermocouple Stype 5 32 3092F 0 1700C Thermocouple R type c 32 3092F 0 1700C Thermocouple N type 328 2340 F 200 1300 C Thermocouple E type 32 1TM2F 0 600C Thermocouple T type2 tc 4 752F 20 400C Thermocouple T type tt 328 752 F 200 400 C Thermocouple J type2 de 4 752F 20 400C Thermocouple J type1 pt 148 1562 F 100 850 C Thermocouple K type2 ro 4 932 F 20 500 C Thermocouple K type1 pi 328 2340 F 200 1300 C RTD Type and Temperature Range Input Temperature Sensor Type LED Display Temperature Range Platinum Resistance Pt100 type 3 pep 32 212 F 0 100 C Platinum Resistance Pt100 type2 ere 4 932F 20 500C Platinum Resistance Pt100 type 1 4 328 1112 F 200 600 C Platinum Resistance JPt100 type 2 Jer 212 PEL i 32 212 F 0 100 C Platinum Resistance JPt100 type 1 4 752 F 20 400 C Page 21 PRECAUTIONS A DANGER Caution Electric Shock Do not touch the AC terminals while the power is supplied to the controller to prevent an electric shock Make sure power is disc
15. least 75 C Use conductors only All line voltage output circuits must have a common disconnect and be connected to the same pole of the disconnect Input wiring for thermocouple current and RTD and output wiring for current 14 VDC is rated CLASS 2 Control wiring as show below Terminal Identification DATA L DATA L d 1 9 MC AC 100 240V EC ma O AC 100 240V 1 N 50 60Hz 5VA 1 N 50 60Hz 5VA DA 9 pata O sow O T OQ OO 3A 250Vac 15 9 3A 250Vac e ALM2 O ALM2 o o o COM 3A 250Vac Qui 9Q 5a 250vac NO 9 O Te lt or DC 4 20mA14Vdc E W Q cov 4 4C OUTI f NO OR 5 OD CD ac 100 240V 4 20MA 50 60 HZ OR Ga 5VA 0 10V 4 COM N 3 ALM 2 3A DATA Dua 250VAC A Q RS 485 2 ARO COM RTD DATA 16C o COM 3A250Vac HE RTD JW 5A 250Vac 2 NO 9 Q TE lt or DC 4 20mA14Vdc D Ocon EE 8C Page 6 FRONT KEY FUNCTIONS Key functions are as follows INDEX Pressing the INDEX key advances the display to the next menu item UP ARROW Increments a value or changes a menu item If pressed during the Operation Mode the set point value will be increased DOWN ARROW Decrements a value or changes a menu item If pressed during the Operation Mode the set point value will be decreased BEBE ENTER Stores the value or item change If not pressed the previously stored value or item will be retained When pressed during the Operation Mode
16. ller will evaluate the process and select the PID values to maintain good control Only available when the control mode is set to PID an Start learning the process After the process has been earned the menu will revert to oFF i Disables Auto Tune Proportional Band Setting Integral time reset time ci Derivative time rate time Oar PD Offset Correction Setting only available when control mode is set to PID and integral time 0 See Programming and Operation of PID function for moving information IF n Integral Deviation Offset Correction associated with each PID Profile n 0 to 4 nca Heating Hysteresis Differential Setting Sets the value for the amount of difference between the turn off point set point and the turn on point Figure A shows the output behavior for a heating reverse acting application Only available when control mode set to on off control ES Cooling Hysteresis Differential Setting Sets the value for the amount of difference between the turn off point set point and the turn on point Figure A shows the output behavior for a cooling direct acting application Only available when control mode set to on off control a a Page 11 DIRECT ACTING UPSCALE DIFFERENTIAL REVERSE ACTING DOWNSCALE DIFFERENTIAL OUTPUT OUTPUT 0 JBIFF INPUT 0 PAIN INPUT SP DISPLAYED VALUE SET POINT SP DISPLAYED VALUE SET POINT Figure A Output behavior for Heating Cooling On Off Appl
17. onnected while checking the unit inside The symbol indicates that this Controller is protected throughout by DOUBLE INSULATION or REINFORCED INSULATION equivalent to Class Il of IEC 536 A WARNING Mount the controller in a location that will not be subject to excessive temperature shock or vibration All models are designed for mounting in an enclosed panel 1 DOP DS 2 tol 11 12 19 14 15 16 Always use recommended solder less terminals Fork terminals with isolation M3 screw width is 7 0mm 6 0mm for 32B Series hole diameter 3 2mm Screw size M3 x 6 5 With 6 8 x 6 8 square washer Screw size for 32B Series M3 x 4 5 With 6 0 x 6 0 square washer Recommended tightening torque 0 4 N m 4kgf cm Applicable wire Solid twisted wire of 2 mm 12AWG to 24AWG Please be sure to tighten them properly Do not allow dust or foreign objects to fall inside the controller to prevent it from malfunctioning Never modify or disassemble the controller Do not connect anything to the No used terminals Make sure all wires are connected to the correct polarity of terminals Do not install and or use the controller in places subject to Dust or corrosive gases and liquid high humidity and high radiation vibration and shock high voltage and high frequency Power must be off when wiring and changing a temperature sensor Be sure to use compensating wires that match the thermo
18. opriate wiring diagram listed on page 6 PANEL CUTOUT DIMENSIONS 110 0 min 60 0 min 4 33 _ 2 36 i i E x E t EN at e ot NH i e 4 E u o LU me Cc dw i 1 91 0 F i mm 44 5 Z mm 1 193 58 7 in Larne in ie ee 65 0 min 2 56 i AE LI ES C onu s SIL ET E NINE E uw E ee es d 450 7 m 1 TT z in Page 4 MOUNTING METHOD Step 1 From the front of the panel slide the controller housing through the cut out The housing gasket should be against the housing flange before installing Step 2 Insert the mounting brackets into the mounting grooves on the top and bottom of the controller 4C 8C and 16C Step 3 Push the mounting brackets forward until the bracket stops at the panel wall Step 4 Insert and tighten the screws on the bracket to secure the controller in place The screw torque should be 0 8 kgf cm Mounting Bracket Installation Page 5 WIRING Do not run thermocouple or other class 2 wiring in the same conduit as power leads Use only the type of thermocouple or RTD probe for which the control has been programmed Maintain separation between wiring of sensor auxiliary in or out and other wiring See the Initial Setting Menu for input selection For thermocouple input always use extension leads of the same type designated for your thermocouple For supply connections use No 16 AWG or larger wires rated for at
19. sult in a safety hazard and system malfunction The following instructions will reset the controller to the original factory default settings Step 1 Press the INDEX KEY while at the Home Display until the controller reads LoC in the process display Use the UP arrow to select LoC1 Press the ENTER KEY to save this value Step 2 Press and hold the UP and DOWN arrows simultaneously for one second Upon releasing the buttons the display will read SHou in the PV display and oF F in the SV display Step 3 Press the INDEX key once and the controller will read PASS in the PV display and a 4321 in the SV display Adjust the value in the SV display to 1357 using the UP and DOWN arrows Press the ENTER KEY to save the value Step 4 Cycle the power on the controller Upon power up all of the user set values have been erased Page 19 SPECIFICATIONS Operation Voltage Range 85 to 110 of rated voltage EEPROM 4K bit non volatile memory number of writes 100 000 2 line x 4 character 7 segment LED display Process value PV Red color Set point SV Green color Sensor Type Thermocouple K J T E N R S B L U TXK Control Output Relay output SPDT SPST 1 16 DIN Max 600 Voltage pulse output DC 14V Max output current 40mA 0 1 of measuring range Ambient Temperature Relative Humidity 0 to 80 non condensing Page 20 Thermocouple Type and Temperature Range Input Temperature Sensor Type LED D
20. to the following for the operation of each setting Control Modes are selected by changing the S HC parameter in the Initial Setting Mode Select HEAt for heating or reverse acting control for output 1 Select CooL for cooling or direct acting control for output 1 Page 8 PROGRAMMING AND OPERATION FOR PID Theory of Operation The PID method of control is based on the individual tuning of proportional band values integral time values and derivative time values to help a unit automatically compensate for changes in a control system The proportional band is the range around the set point in which the control s proportioning takes place The control increases or decreases the output proportionately to the process temperature s deviation from the set point The integral time eliminates undershoot and overshoot of the set point by adjusting the proportioning control based on the amount of deviation from the set point during steady state operation The derivative time eliminates undershoot and overshoot by adjusting the proportioning control based on the rate of rise or fall of the process temperature The integral deviation offset correction ioFn improves the speed in which the process value reaches the set point value If this parameter is set to zero the output will be zero when the process value is equal to the set point value If the integral time parameter is used only to eliminate steady state error it may take a long time to reac
21. ype 328 932 F 200 500 C 328 1562 F 200 850 C 212 3272 F 100 1800 C 32 3092 F 0 1700 C 32 3092 F 0 1700 C 328 2340 F 200 1300 C 32 1112 F 0 600 C 4 752 F 20 400 C 328 752 F 200 400 C 4 752 F 20 400 C 148 1562 F 100 850 C 4 932 F 20 500 C Thermocouple K type1 328 2340 F 200 1300 C Platinum Resistance Pt100 type 3 FF 32 212 F 0 100 C Platinum Resistance Pt100 type 2 Pte 4 932 F 20 500 C Platinum Resistance Pt100 type 1 2E 328 1112 F 200 600 C Platinum Resistance JPt100 type 2 Pep 32 212 F 0 100 C Platinum Resistance JPt100 type 1 Pkt 4 752 F 20 400 C Ln Temperature Units This parameter is only available for thermocouple or RTD inputs Thermocouple L type Thermocouple B type Thermocouple S type Thermocouple R type Thermocouple N type Thermocouple E type Thermocouple T type2 Thermocouple T type1 Thermocouple J type2 Thermocouple J type1 Thermocouple K type2 EF H Scale Height Limit Sets the upper limit of the temperature range If the process temperature exceeds this setting the display will flash an error code Scale Low Limit Sets the lower limit of the temperature range If the process temperature exceeds this setting the display will flash an error code Control Mode Select method of control operation Can be set to PI
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