User Manual - Schulz Electronic GmbH
Contents
1. Command Name Sent Frame Answer Frame Command Parameter Command Parameter PING OxFEO1 0 OxFFO1 0 IDENT OxFEO2 0 OxFF02 ID GETHARDVER OxFEO6 0 OxFFO6 Version GETSOFTVER OxFEO7 0 OxFF07 Version GETSERIAL OxFEO8 0 20 OxFFO8 Refer to description GETIDSTRING OxFEO9 0 20 OxFFO9 Refer to description PING This command is used to determine the presence of a connected driver and to initialize its interface It does not change any registers The command parameter is always 0 the answer parameter too IDENT This command is used to determine the device ID of an attached recipient It has no effect on the condition of the recipient The parameter is always 0 The answer contains the ID GETHARDVER Instructs the driver to send back the version number of its hardware The parameter is always 0 The answer contains the hardware version number The format of the answer is 0x000000 lt major gt lt minor gt lt revision gt In other words one byte for each of the three elements of the version number As example version 1 2 3 has the parameter 0x000000010203 GETSOFTVER Instructs the driver to send back the version number of its firmware The parameter is always The answer contains the software version of the recipient The format of the answer is 0x000000 lt major gt lt minor gt lt revision gt In other words one byte for each of the three elements of the version number As example ve2. Command Parameter Answer Description gd lt channel gt D value Returns the parameter of the D controller of the given channel Note In single channel mode the first parameter lt channel gt must not be set gdmin minimum D Returns the minimum parameter of the D value controller gdmax maximum D Returns the maximum parameter of the D value controller grntc input resistance in Returns the configured resistance of the given Ohm input channel NTC srntc input lt R gt Sets the resistance of the selected input to the given value grntcmin minimum Returns the minimum resistance value of the resistance in connected NTC Ohm grntcmax maximum Returns the maximum resistance value of the resistance in connected NTC Ohm gbntc lt input gt B value Returns the configured B value of the given input channel sbntc lt input gt lt B gt Sets the B value of the selected input to the given value gbntcmin minimum B Returns the minimum B value of the connected value NTC gbntcmax maximum B Returns the minimum B value of the connected value NTC gtntc lt input gt temperature Returns the configured norm temperature of the K given input channel stntc lt input gt lt T gt Sets the norm temperature of the selected input to the given value gtntcmin minimum Returns the minimum norm temperature of the temperature in connected NTC K gtntcmax maximum Returns the maximum norm temperature of the
3. Pic LAS DOWER User Manual PL TEC 2 1024 PicoLAS GmbH Company for Innovative Power Electronics und Laser Technology Schulz Y Electronic KaiserstraBe 100 52134 Herzogenrath Schulz Electronic GmbH Tel 49 0 2407 563 58 0 Dr Rudolf Eberle StraBe 2 7 D 76534 Baden Baden Fax 49 0 2407 563 58 29 Fon 49 7293 PET E Mail infoGpicolas de i AM n vertrieb Qschulzzel ctronic de Web www picolas de www schulz el ctronic de Pic LAS FOCUSSING POWER TO THE POINT Table of Contents PL aT EC PPM pr eege ta eis EEN 1 Table Of CONTENTS arises cet ELM 2 Description of CONNECT ON EE 3 How to get started with an HB 21 7 How to get started without an PLR 21 nennen nnns 7 IDos andiDOR ise oeste rM M NM E 8 Absolute Maximum Rating 8 Functional DESEriIPUlOM EE a a ERE 9 qose E 10 nE EE 10 Over Temperature Sbutdown eterne nen ennt enn nennen nnns 10 Mechanical DIMENSIONS antes ette 11 Poweron EE 12 Controlling the drive ssis 12 Controlling the driver using a BUB A71 13 Controlling the driver EE 16 Register descriptlOlt s tite AREE 30 Pic LAS FOCUSSING POWER TO THE POINT Description of Connections The following drawing shows all connections which are available to the user VCC GND NTC and PT
4. Dos and Don ts Never make a short at the output This will not do any harm to the laser driver but will yield in an incorrect current measurement Mount the driver on an appropriate heat sink The driver will shut down under over temperature circumstances Depending on the desired current a slight airflow across the black coils on top is necessary Please keep the temperature of these devices below 85 C Never connect either of the TEC Outputs to GND VCC as the polarity of the output clamps changes when the TEC switches from heating to cooling or from cooling to heating Absolute Maximum Ratings Supply voltage range 12 V 50 V max during operation Destroying limit 56 V Maximum input current 20 A Maximum TEC output current in single channel mode 10 A Maximum TEC output current in dual channel mode 5 A BOB connector input and output voltages 0 V to 3 3 V Terminals 5 V proof BOB connector output currents 1 mA Auxiliary 3 3 V supply voltage output current 30 mA Pin 8 of BOB Conn planned for Rev 2 1 Auxiliary 12 V supply voltage output current 100 mA Pin1 of PLB 21 Conn Operating temperature 0 55 C Pic LAS FOCUSSING POWER TO THE POINT Functional Description The PL TEC operating principle is based on the LDP CW 2050 LDP CW operates with four parallel buck converters S1 S2 D1 D2 L1 S3 4 D3 D4 L2 S5 S6 D5 D6 L3 S7 S8 D7 D8 L4 Every single converter has an independent control
5. for working the PLB 21 properly Menu Structure The following diagram shows the structure of the PLB 21 menu which affects the driver All entries are described in detail All other menu entries are described in the PLB 21 manual For detailed instructions see the PLB 21 manual Note that if the TEC is used in dual channel mode there Config and Controller entries for both channel 0 and channel 1 Menu root Setpoint o 1 51 Fi o 1 act o 2 stp Fi o 2 act Config ChO 1 o Input o R Ohm o B o T K Controller ChO 1 o A o P o o D Defaults o Def pwron o Load defaults o Save defaults 13 Pic LAS FOCUSSING POWER TO THE POINT Setpoint In this menu point the setpoint temperature for channel O and 1 can be modified Furthermore the actual temperatures can be read 1 stp Fi This value defines the setpoint temperature of TEC channel 1 in dual channel mode or the setpoint temperature in single channel mode 1 act This read only value shows the actual measured temperature which is used by the control loop of channel 1 2 stp Fi This value defines the setpoint temperature of TEC channel 2 in dual channel mode When the single channel mode is used this menu point will not be shown 2 act This read only value shows the actual measured temperature which is used by the control loop of channel 2 When the single channel mode is used this menu point will not be shown Config
6. temperature in connected NTC K grptc lt input gt resistance in Returns the configured resistance of the given Ohm input channel PTC srptc lt input gt lt R gt Sets the resistance of the selected input to the given value PTC grptcmin resistance in Returns the minimum resistance value of the Ohm connected PTC grptcmax resistance in Returns the maximum resistance value of the Ohm connected PTC gmaxcur lt channel gt current in A Returns the configured maximum output current of the given controller Note In single channel mode the first parameter channel must not be set 19 Pic LAS FOCUSSING POWER TO THE POINT Command Parameter Answer Description smaxcur lt channel gt lt current gt Sets the maximum current of the selected channel to the given value Note In single channel mode the first parameter lt channel gt must not be set gmaxcurmin maximum current in A Returns the minimum output current of the TEC gmaxcurmax minimum current in A Returns the maximum output current of the TEC ginput lt channel gt selected input Returns the current input number of the given channel 0 NTC 1 1 NIC 2 3 PIC 1 4 PTC 2 Note In single channel mode the first parameter lt channel gt must not be set sinput lt channel gt lt input gt Sets the input of the selected channel to the given value 0 NTC 1 1 NI
7. 0 Ox010A 32 bit value GETKP 0x0042 Refer to description 0x010A 32 bit value SETKP 0x0043 Refer to description 0x010A 32 bit value GETKIMIN 0x0044 0 0x010B 32 bit value GETKIMAX 0x0045 0 0x010B 32 bit value GETKI 0x0046 Refer to description 0x010B 32 bit value SETKI 0x0047 Refer to description 0x010B 32 bit value GETKDMIN 0x0048 0 0x010C 32 bit value GETKDMAX 0x0049 0 0x010C 32 bit value GETKD 0x004A Refer to description 0x010C 32 bit value SETKD 0x004B Refer to description 0x010C 32 bit value GETRNTCMIN 0x0050 0 0x010D 32 bit value GETRNTCMAX 0x0051 0 0x010D 32 bit value GETRNTC 0x0052 Refer to description 0x010D 32 bit value SETRNTC 0x0053 Refer to description 0x010D 32 bit value GETBNTCMIN 0x0054 0 0x010E 32 bit value GETBNTCMAX 0x0055 0 0x010E 32 bit value GETBNTC 0x0056 Refer to description OxO10E 32 bit value SETBNTC 0x0057 Refer to description OxO10E 32 bit value 23 Pic LAS FOCUSSING POWER TO THE POINT Command Sent Frame Received Frame Command Parameter Command Parameter GETTNTCMIN 0x0058 0 0x010F 32 bit value 0 0059 0 0x010F 32 bit value GETTNTC 0x005A Refer to description Ox010F 32 bit value SETINTC 0x005B Refer to description Ox010F 32 bit value GETRPTCMIN 0x005C 0 0x0110 32 bit value GETRPTCMAX 0 0050 0 0 0110 32 bit value GETRPTC Ox005E Refer to description 0x0110 32 bit value SETRPTC Ox005F Refer to description 0x0110 32 bit v
8. Ch0 1 Each TEC channel can be configured independently from each other Note that the configuration of a single input R B T applies to both channels if both channels have the same input selected If the TEC is configured in single channel mode only Config ChO is shown Input Possible values are NTC1 NTC2 PTC1 or PTC2 which represents the four different input channels R This value defines the base resistance of the connected temperature sensor measured in Ohms B This value defines the B value of the connected temperature sensor It is only used in case of an NTC T This value defines the base temperature of the connected temperature sensor measured in C It is only used in case of a NTC Controller CHO 1 Each TEC control loop have its own P and D values as well as a maximum output current If the TEC is configured in single channel mode only Controller ChO is shown Imax A This value defines the maximum output current of the TEC channel measured in amperes P This value defines the parameter oh the P controller This value defines the parameter oh the l controller D This value defines the parameter oh the D controller 14 Pic LAS FOCUSSING POWER TO THE POINT Defaults The driver can load a default setting each time it powers up or the user commands it to do so This is done within this Submenu Def pwron When enabled the driver loads the saved settings each time it powers up Load Whe
9. Description Direction Comments 1 Marked in red 12 V Output Only for the use with the PLB21 prevent any overload or short Max 100 mA 2 TXD VO RS232 Standard serial interface 3 RXD VO RS232 Standard serial interface 4 right GND Output Pic LAS FOCUSSING POWER TO THE POINT Pin Assignments and Description of the Thermistor Pinheaders The pictures are in the same view than the overview picture Warning For improved EMI noise immunity the leads of the thermistors must be kept floating The GND Pins of the PT100 can be used for shielding Shielding must be kept single ended too Remark The targeted value for the NTC is 10k Factory set If you need 1k NTCs or a low temperature switch from 10k to 1k via software command Dual Channel Operation Switch in shown position Single Channel operation Switch in lower position NTC Ch 1 Channel 1 NTC Ch 1 NTC 10k 1k NTC Ch 1 Ret SEH NTC Ch 1 Return A No function Channel 2 do not connect NTC Ch 2 Return NTC 10k 1k o function we E PT100 Ch 1 Channel 1 PT100 Ch1 S k PT 100 PT100 Ch 1 Return GND PT100 Ch 1 Return GND No functi GND ll SEND PT100 Ch 2 Return GND Channel 2 PT 100 No function PT100 Ch 2 Pic LAS FOCUSSING POWER TO THE POINT Pin Assignments and Description of the TEC srew terminals The pictures are in the same view than the overview picture Output Dual Channel Single Pictu
10. value of the LSTAT and ERROR register combined in a single 64bit value The lower 32bit represents the LSTAT register the upper 32bit the ERROR register SETLSTAT This command sets the LSTAT register to the given value The return value contains the new register value CLEARERROR This command clears a part of the internal ERROR register For a detailed description of the ERROR register see below SAVEDEFAULTS This command saves all settings to an internal EEProm LOADDEFAULTS This command loads previously saved settings into the driver 25 Pic LAS FOCUSSING POWER TO THE POINT GETKPMIN The return value contains the minimum value of the P controller GETKPMAX The return value contains the maximum value of the P controller GETKP This command returns the value of the P controller of the given channel 0 1 The lower 32bit of the return value represents the data in a 32 bit integer format SETKP This command sets the value of the P controller to the given data The bits 56 63 select the channel the bits 0 31 represents the setpoint value in a 32 bit signed integer format The setpoint value must be within the borders defined by the minimum and maximum temperature values given by the GE7KPMIN and GETKPMAX command The return value contains the actual setpoint value See GE7KP command GETKIMIN The return value contains the minimum value of the I controller GETKIMAX The return value contains the maximum v
11. 00 Data bits 8 Stop bits 1 Parity even 16 Pic LAS FOCUSSING POWER TO THE POINT The Serial Text Interface The following section describes the structure and commands of the text interface Structure Every command that is sent to the TEC must be completed with a CR Enter It consists of a command word followed by a parameter If the command was successfully executed a 00 is sent otherwise a 01 If there is an error pending the response will be 10 otherwise 11 If the command requires an answer parameter this parameter is sent before the confirmation is given Example The user would like to read out the actual setpoint temperature of channel 0 User input gsoll 0 lt Enter gt Output of the TEC 12 2 CR LF 00 lt CR gt lt LF gt Example 2 The user would like to set a new setpoint temperature to channel 0 User input scurrent 25 7 lt Enter gt Output of the LDP CW 25 7 lt CR gt lt LF gt O0 CR LF Input is done in ASCII code and is case sensitive Every terminal can be used that supports this standard Commands for the TEC 2 1024 The following table contains a command reference for the TEC 2 1024 Command Parameter Answer Description ssoll channel value Sets the setpoint temperature th the given value A dot is used as decimal point No more then two decimal places are used 12 225 is the same as 12 22 Note In single channel mode the first para
12. 100 connectors see table 4 Holes for Heatsink 3 1 mm trough TEC connector screw terminals refer to table Switch shown in upper position LDP C BOB Connector Pin 1 marked RS232 PLB Conn Pin 1 marked VCC Supply voltage 12 48V 50 V max GND Supply ground LD Positive laser diode output anode Use both connectors parallel for high currents LD Negative laser diode output cathode Do not connect to ground Use both LDP C BOB Conn RS232 PLB21 Conn connectors parallel for high currents Mini MOLEX Connector for Analogue TTL Control of the driver see below Mini MOLEX Connector for RS232 Communication or PLB21 see below Pic LAS FOCUSSING POWER TO THE POINT For a more convenient use of the driver e g in laboratory use we recommend the optional available product accessory LDP C BOB Please see LDP C BOB manual for further details Pin Assignments and Description of the MOLEX Pinheaders The pictures are in the same view than the overview picture Pin Number Description Direction Comments 1 Marked in red reserved Do not connect 2 reserved Do not connect 3 reserved Do not connect 4 ENABLE Input OV disabled 3 3 V driver enabled 5 TEC_OK Output OV Pulser not ok or power up self test not passed yet 3 3V Pulser ok test passed 6 GND Output 7 reserved 8 right GND Output Do not connect Pin Number
13. C 2 3 PIC 1 4 PTC 2 Note In single channel mode the first parameter lt channel gt must not be set gregler lt channel gt see text This command prints out the internal controller values The format is lt setpoint gt tab lt actual value gt tab lt err gt tab lt err sum gt tab lt previous err gt tab lt duty cycle in A gt f an Error Occurs If an error occurs during operation the pulse output is switched off and the return value of a command is no longer 0 or 1 but 10 or 11 Errors have to be acknowledged with a toggle of the ENABLE signal otherwise switching on again of TEC output is not possible For more details see the description of the ERROR register To retrieve the error use the gerror command for the content of the ERROR register or the gerrtxt command for a human readable form 20 PICeLAS FOCUSSING POWER TO THE POINT The PicoLAS Protocol The following section describes the structure and possible commands of the PicoLAS protocol Structure Each transmission consists of 12 bytes called a frame as follows which must be sent consecutively Otherwise the system times out and the transmission must start again from the beginning A frame has a fixed structure The first two bytes describe the command the following eight bytes the parameters followed by one reserved byte and one checksum byte The checksum is calculated out of the first 11
14. alue GETIMAX 0x0060 Refer to description 0x0111 32 bit value GETIMAXMAX 0x0061 0 0x0111 32 bit value GETIMAXMIN 0x0062 0 0x0111 32 bit value SETIMAX 0x0063 Refer to description 0x0111 32 bit value GETREGLERPARAM 0x0070 Refer to description 0 0115 32 bit value 24 Pic LAS FOCUSSING POWER TO THE POINT Description of the Individual Commands GETSOLL This command returns the setpoint temperature of the given channel 0 1 The lower 32bit of the return value represents the setpoint in a 32 bit integer format in steps of 0 01 C GETSOLLMIN The return value contains the minimum setpoint temperature in steps of 0 01 C GETSOLLMAX The return value contains the maximum setpoint temperature in steps of 0 01 C SETSOLL This command sets the current setpoint to the given value in steps of 0 01 C The bits 56 63 select the channel the bits 0 31 represents the setpoint value in a 32 bit signed integer format The setpoint value must be within the borders defined by the minimum and maximum temperature values given by the GE7TSOLLMIN and GETSOLLMAX command The return value contains the actual setpoint value See G 7SOLL command GETLSTAT This command returns the value of the LSTAT register For a complete description of this register see below GETERROR This command returns the value of the ERROR register For a complete description of this register see below GETREGS This command returns the
15. alue of the I controller GETKI This command returns the value of the I controller of the given channel 0 1 The lower 32bit of the return value represents the data in a 32 bit integer format SETKI This command sets the value of the l controller to the given data The bits 56 63 select the channel the bits 0 31 represents the setpoint value in a 32 bit signed integer format The setpoint value must be within the borders defined by the minimum and maximum temperature values given by the GE7K MIN and GETKIMAX command The return value contains the actual setpoint value See GETK command GETKDMIN The return value contains the minimum value of the D controller GETKDMAX The return value contains the maximum value of the D controller GETKD This command returns the value of the D controller of the given channel 0 1 The lower 32bit of the return value represents the data in a 32 bit integer format SETKD This command sets the value of the D controller to the given data The bits 56 63 select the channel the bits 0 31 represents the setpoint value in a 32 bit signed integer format The setpoint value must be within the borders defined by the minimum and maximum temperature values given by the GE7KDMIN and GETKDMAX command The return value contains the actual setpoint value See GETKD command 26 Pic LAS FOCUSSING POWER TO THE POINT GETRNTCMIN The return value contains the minimum possible resistance value
16. bytes which are linked by a bitwise XOR Thus a frame has the following structure Byte Meaning 1 Bit 8 15 of the command 2 Bit 0 7 of the command 3 Bit 56 63 of the parameter 4 Bit 48 55 of the parameter 5 Bit 40 47 of the parameter 6 Bit 32 39 of the parameter 7 Bit 24 31 of the parameter 8 Bit 16 23 of the parameter 9 Bit 8 15 of the parameter 10 Bit 0 7 of the parameter 11 Reserved always 0x00 12 Checksum A properly received frame must be acknowledged by the recipient with an answer which is also a frame If the acknowledgement does not occur then the command has not been processed and the sending procedure should be repeated If the recipient recognizes the command as valid but not the parameters then it will answer with a ILGLPARAM OxFF12 as command In the case that the recipient receives an invalid command it will answer with UNCOM OxFF13 If a faulty checksum is recognized then the answer is RXERROR OxFF10 H this error occurs often then the connection should be checked Using the REPEAT OxFF11 command the recipient can instruct the sender to send the most recent frame again 21 Pic LAS FOCUSSING POWER TO THE POINT General Commands The following list contains an overview of the general commands which are supported by every product from PicoLAS which makes use of this protocol The explanation of the individual commands is given further below
17. d prevent an over temperature shutdown If working with high currents above 5 A it is recommended to cool the power inductors as well This can be achieved easily by placing the pulser with its heat sink in the air flow of a fan Losses in W 1 1 5 2 25 3 35 4 45 5 55 6 65 7 75 8 85 9 9 5 10 loutin A Power dissipation over output current Over Temperature Shutdown To protect itself the LDP CW automatically shuts down itself if its temperature rises above 80 C This condition is latched and the appropriate bit in the ERROR register is set To re enable the LDP CW the ENABLE pin must be toggled 10 Pic LAS FOCUSSING POWER TO THE POINT Mechanical Dimensions Over all height 30 mm All dimensions in mm Pic LAS FOCUSSING POWER TO THE POINT Power on self test Each time the driver is powered up it performs a test of its internal safety features The driver cannot be enabled until a self test is performed successfully The PULSER_OK signal will be pulled high when the test was successful The test will take less than 5 seconds but can take up to 15 seconds due to internal time outs if any failure is detected Controlling the driver The TEC 2 1024 is designed to operate with a connected digital control However it can be operated stand alone when all necessary settings are configured previously as It remembers all settings from the last time it was powered on Furthermore it can be configur
18. d sets the PTC output current of the TEC to the given data The bits 56 63 select the TEC channel the bits 0 31 represents the resistance value in a 32 bit signed integer format in steps of 0 01A The setpoint value must be within the borders defined by the minimum and maximum values given by the GETIMAXMIN and GETIMAXMAX command The return value contains the actual maximum current See GET MAX command 28 Pic LAS FOCUSSING POWER TO THE POINT GETREGLERPARAM This command returns the actual parameters used by the PIC controller The given parameter selects the data which is to be returned Possible values are Parameter Return value 0 reserved 1 reserved 2 reserved 3 calculated error used by P controller 4 summated error used by I controller 5 previous error used by D controller 6 calculated TEC current in 0 01A 29 Pic LAS FOCUSSING POWER TO THE POINT Register description Description of the STAT Register The following list contains a description of the individual STAT bits These can be read with GETSTAT and written with SETSTAT With SETLSTAT a complete 32 bit word must always be written Thus to change individual bits the register must first be read out with GETSTAT then the desired bits changed and then with SETSTAT passed again to the TEC Bit Name Read Write Meaning 0 CHO_TEC_ON Read write Switches the control loop of channel on or off No
19. e input NTC channel the bits 0 31 represents the B value in a 32 bit signed integer format The setpoint value must be within the borders defined by the minimum and maximum values given by the GETBNTCMIN and GETBNTCMAX command The return value contains the actual resistance See GETBN7TC command GETTNTCMIN The return value contains the minimum possible norm temperature of the NTC channels The lower 32bit of the return value represents the data in a 32 bit integer format in steps of 0 1 K The return value contains the maximum possible norm temperature of the NTC channels The lower 32bit of the return value represents the data in a 32 bit integer format in steps of 0 1 K GETTNTC This command returns the configured norm temperature of the given NTC input 0 1 The lower 32bit of the return value represents the data in a 32 bit integer format in steps of 0 1 K 27 Pic LAS FOCUSSING POWER TO THE POINT SETTNTC This command sets the NTC norm temperature to the given data The bits 56 63 select the input NTC channel the bits 0 31 represents the norm temperature in a 32 bit signed integer format in steps of 0 1 K The setpoint value must be within the borders defined by the minimum and maximum values given by the GETBNTCMIN and GETBNTCMAX command The return value contains the actual resistance See GETBNTC command GETRPTCMIN The return value contains the minimum possible resistance value
20. ed to load default values on power on In this case it loads pre configured settings each time the power is toggled Connecting a digital control to the driver does not alter the internal settings No digital control If no digital control is attached only the BOB Connector could be used to enable disable the driver To do so the input pin4 at the BOB connector ENABLE must be set HIGH If an error occurs e g over temperature the TEC will be disabled and the pin 5 of the BOB connector TEC OK is pulled low The ENABLE pin has to be toggled to enable the driver again PLB 21 If a PLB 21 is attached to the TEC it can be used to control its behavior The PLB 21 may ask for a driver to download This must be confirmed with yes in order for the PLB 21 to work properly This must always be done when the PLB 21 was connected to any other PicoLAS product After the download all operating parameters can be accessed using the PLB 21 For a detailed description see chapter PLB 21 below PC If the TEC is connected to a PC all operating parameters can be accessed via a serial RS232 terminal program or the PicoLAS protocol For a detailed description of the serial text protocol and the PicoLAS protocol see below 12 Pic LAS FOCUSSING POWER TO THE POINT Controlling the driver using a PLB 21 When the PLB 21 is connected the first time to the driver the user is asked to download a new driver This must be confirmed with yes
21. efault loads previously saved settings savedefault saves the current settings as defaults sp lt channel gt lt P gt Sets the parameter of the P controller of the given channel Note In single channel mode the first parameter lt channel gt must not be set gp lt channel gt P value Returns the parameter of the P controller of the given channel Note In single channel mode the first parameter lt channel gt must not be set gpmin minimum P value Returns the minimum parameter of the P controller gpmax maximum P value Returns the maximum parameter of the P controller si channel lt l gt Sets the parameter of the I controller of the given channel Note In single channel mode the first parameter channel must not be set channel value Returns the parameter of the I controller of the given channel Note In single channel mode the first parameter channel must not be set gimin minimum value Returns the minimum parameter of the I controller gimax maximum value Returns the maximum parameter of the l controller sd channel D Sets the parameter of the D controller of the given channel Note In single channel mode the first parameter channel must not be set 18 Pic LAS FOCUSSING POWER TO THE POINT
22. loop with a current sensor Imeas1 Imeas2 Imeas3 and Imeas4 The set point current that is pretended by the user is evenly spread over all four converters Several security features protect the laser diode and LDP CW from damage D8 protects the laser diode from reverse currents while D7 protects the driver in case of a load failure In case of a failure the control unit disables the LDP CW A soft start mechanism slowly raises the current after enabling the LDP CW In contrary to the LDP CW 2050 all 4 channels are linked to separate screw terminals Furthermore they are terminated with an RC Filter to reduce the EMI noise on the TEC V GND 232 PLB Operation Principle of LDP CW 20 50 driver Element Function S1 S2 S3 S4 S5 S6 S7 S8 Buck Converter D1 D2 D3 D4 D5 D6 D7 D8 L1 L2 L3 L4 CO D7 D8 Free wheeling and driver protection diodes Input Buffer Capacitor Pic LAS FOCUSSING POWER TO THE POINT Power Supply The power supply must be able to cover the output power plus the internal power losses refer to next chapter Example You have a 48 V power supply The maximum TEC power will be 240 W at 6 A The total power consumption will be 240 W 12 W 252 W Divided by 48 V this yields 5 25 A better 6 A of current consumption at the DC Terminals Cooling The driver produces up to 31 W of losses Thus the base plate has to be mounted on a heat sink to ensure proper operation an
23. meter channel must not be set gsoll lt channel gt temperature in Outputs the actual setpoint temperature Note In single channel mode the first parameter lt channel gt must not be set gsollmin temperature in Outputs the minimum output current gsollmax temperature in Outputs the maximum output current gist channel temperature Outputs the actual measured temperature of the given channel Note In single channel mode the first parameter channel must not be set 17 Pic LAS FOCUSSING POWER TO THE POINT Command Parameter Answer Description con lt channel gt Activates the control loop of the given channel Note In single channel mode the first parameter lt channel gt must not be set coff lt channel gt Deactivates the control loop of the given channel Note In single channel mode the first parameter lt channel gt must not be set gerr 32 bit number Outputs the ERROR register gerrtxt error text description of every pending error stat Returns the value of the internal status register gserial serial number Returns the device serial number gname device name Returns the devices internal name ghwver hardware version prints out the hardware version gswver software version prints out the software version ps current settings Prints out an overview of all settings loadd
24. n activated via turning the Jogdial or the ENTER key all internal registers are changed to the previously saved values The output stage has to be re enabled via the L_ON bit or the FIRE Key afterwards Save When activated via turning the Jogdial or the ENTER key all internal registers are stored into an internal EEprom for later usage Ifan Error Occurs If an error occurs during operation the pulse output is switched off the TEC OK signal on the BOB connector is pulled low and a message is displayed on the PLB 21 If no other action is described on the display a toggle of the ENABLE pin resets the error condition and re enables the driver 15 Pic LAS FOCUSSING POWER TO THE POINT Controlling the driver via PC Introduction When the TEC is connected to a PC it allows communications over a serial text interface as well as the PicoLAS protocol While the text interface is designed for communication with a terminal program the PicoLAS protocol is designed as a system interact protocol The switching between the two protocols occurs automatically as soon as the driver receives a certain sequence The corresponding commands are e PING for the PicoLAS protocol e init followed by Enter for the text interface Description of the RS232 Interface The LDP CW 20 50 implements a standard RS232 interface It can be connected to a PC using a tree wire connection The connection settings are Baud rate 1152
25. of the NTC channels The lower 32bit of the return value represents the data in a 32 bit integer format GETRNTCMAX The return value contains the maximum possible resistance value of the NTC channels The lower 32bit of the return value represents the data in a 32 bit integer format GETRNTC This command returns the configured NTC resistance of the given NTC input 0 1 The lower 32bit of the return value represents the data in a 32 bit integer format SETRNTC This command sets the NTC resistance to the given data The bits 56 63 select the input NTC channel the bits 0 31 represents the resistance value in a 32 bit signed integer format The setpoint value must be within the borders defined by the minimum and maximum values given by the GETRNTCMIN and GETRNTCMAX command The return value contains the actual resistance See GETRNTC command GETBNTCMIN The return value contains the minimum possible B value of the NTC channels The lower 32bit of the return value represents the data in a 32 bit integer format GETBNTCMAX The return value contains the maximum possible B value of the NTC channels The lower 32bit of the return value represents the data in a 32 bit integer format GETBNTC This command returns the configured B value of the given NTC input 0 1 The lower 32bit of the return value represents the data in a 32 bit integer format SETBNTC This command sets the NTC B value to the given data The bits 56 63 select th
26. of the PTC channels The lower 32bit of the return value represents the data in a 32 bit integer format GETRPTCMAX The return value contains the maximum possible resistance value of the PTC channels The lower 32bit of the return value represents the data in a 32 bit integer format GETRPTC This command returns the configured resistance of the given PTC input 0 1 The lower 32bit of the return value represents the data in a 32 bit integer format SETRPTC This command sets the PTC resistance to the given data The bits 56 63 select the input NTC channel the bits 0 31 represents the resistance value in a 32 bit signed integer format The setpoint value must be within the borders defined by the minimum and maximum values given by the GETRPTCMIN and GETRPTCMAX command The return value contains the actual resistance See GETAP7C command GETIMAXMIN The return value contains the minimum possible output current of the TEC The lower 32bit of the return value represents the data in a 32 bit integer format in steps of 0 01A GETIMAXMAX The return value contains the maximum possible output current of the TEC The lower 32bit of the return value represents the data in a 32 bit integer format in steps of 0 01A GETIMAX This command returns the configured maximum output current of the TEC of the given channel 0 1 The lower 32bit of the return value represents the data in a 32 bit integer format in steps of 0 01A SETIMAX This comman
27. re of the pcb in same position as in main name operation Channel overview operation shown position Switch in lower position Remark The polarity of the TEC cannot be changed by software command Therefore if the TEC heats or cools uncontrollable the polarity has to be changed manually Remark If the switch is altered during power on the TEC will shutdown itself until the power is toggled Warning For single channel operation the user must connect Output A with B and C with D as shown Pic LAS FOCUSSING POWER TO THE POINT How to get started with an PLB 21 Step What to do Note 1 Unpack your Device 2 Connect the PLB 21 Use PLB 21 Pinheader and special cable 3 Apply the supply voltage Apply any voltage between 12 V and 48 V at VCC with respect to GND 4 Wait until pulser ok is high Pin 5 with respect to Pin 6 must turn from OV to 3 3 V 5 Apply the temperature setpoint Use the PLB 21 to adjust the setpoint temperature by turning the dial 6 Set enable pin high Apply 3 3 V to pin 4 of the BOB connector The current will start up now 7 Check If the Driver is not proper cooled it will shut down How to get started without an PLB 21 Remark The temperature setpoints can not be applied analogue However the usage of the driver without any digital interface RS232 via PC or PLB21 is possible when all necessary settings have been done previously Pic LAS FOCUSSING POWER TO THE POINT
28. rsion 2 3 4 has the parameter 0x000000020304 GETSERIAL Instructs the driver to send back its serial number If O is sent as parameter the answer contains the number of ASCII digits of the serial number otherwise the respective position of the serial number is sent in ASCII format GETIDSTRING Instructs the driver to send back its name If 0 is sent as parameter the answer contains the number of digits of the string otherwise the respective position of the serial number is sent in ASCII format 22 PICeLAS FOCUSSING POWER TO THE POINT Commands for the driver The following table contains a list of the commands which the TEC supports in addition to the generally applicable commands An explanation of the individual commands and its parameters follows afterwards Command Sent Frame Received Frame Command Parameter Command Parameter GETSOLL 0x0010 0 0x0101 32 bit value GETSOLLMIN 0x001 1 0 0x0101 32 bit value GETSOLLMAX 0x0012 0 0x0101 32 bit value SETSOLL 0x0013 Refer to description 0x0101 32 bit value GETLSTAT 0x0020 0 0x0103 32 bit value GETERROR 0x0021 0 0x0114 32 bit value GETREGS 0x0022 0 0x0105 64 bit value SETLSTAT 0x0023 Refer to description 0x0103 32 bit value CLEARERROR 0x0024 0 0x0104 0 SAVEDEFAULTS 0x0027 0 0x0112 0 LOADDEFAULTS 0x0028 0 0x0112 0 GETKPMIN 0x0040 0 Ox010A 32 bit value GETKPMAX 0x0041
29. s 6 and 7 are set during the power on self test They can not be cleared by the ENABLE pin or the CLEARERROR command If one of these bits is set the supply voltage should be switch off and on again If the error persists the LDP CW needs to be repaired Bit Name R W Meaning D DRV_OVERTEMP Read Indicates an over temperature shutdown of the output stage 1 DRV FAIL Read Indicates a shutdown of the LDP CW due to a load failure or an over current 2 reserved Read Reserved 3 TEC_SWITCH_FAIL Read This bit indicates that the mode switch was switched while the power was turned on 4 CFG CHKSUM FAIL Read Indicates that the internal configuration register is corrupt If this error persists the TEC needs to be repaired 5 reserved Read Reserved 6 CAL CHKSUM FAIL Read Indicates that the internal calibration registers are corrupt If this error persists TEC needs to be repaired 7 DEF CHKSUM FAIL Read Indicates that the internal default registers are corrupt The default values should be re saved 8 TEC ADC FAIL Read This bit indicates a internal error If this bit persists TEC needs to be repaired 9 Reserved Read Reserved 31 31
30. te that the ENABLE pin of the BOB connector must also be set high in order to enable the TEC 1 2 CHO INPUT Read Write These bits select the input for channel 0 Possible values are 0 NTC input 0 1 3 NTC input 1 2 PTC input 0 3 PTC input 1 3 CH TEC ON Read Write the control loop of channel 1 on or off Note that the ENABLE pin of the BOB connector must also be set high in order to enable the TEC 4 5 CH1_INPUT Read Write These bits select the input for channel 1 Possible values are 0 NTC input 0 D NTC input 1 2 input 0 3 PTC input 1 6 ENABLE_OK Read This bit indicates the state of the ENABLE pin of the BOB 7 TEC_OK Read This bit indicates the state of the TEC_OK pin of the BOB 8 reserved Read reserved 9 DEFAULT_ON_PWRON Read Write If this bit is set to 1 the TEC will load the previously saved settings every time the power is toggled 10 SWITCH Read Write This bit indicates the state of the mode switch A value of 1 means that the TEC is in single channel mode 11 31 Reserved Read Reserved 30 Pic LAS FOCUSSING POWER TO THE POINT Description of the ERROR Register The following list contains a description of the individual bits of the ERROR register A 1 as a bit leads to a deactivation of the drivers output The Bits O and 1 are cleared every time the ENABLE pin is set low or when the CLEAERROR command is used The Bit
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