Wavelength Electronics LFI-3751 User Manual Download

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Chapter 4: Remote Interface Reference

Summary of Contents for LFI-3751

Page 1: ...Autotune PID capability the LFI 3751 automatically optimizes virtually any thermal load reduce overshoot or improve temperature stability with the push of a button The Wavelength Advantage Autotune PID PID Constants adjustable via front panel Auto ranging thermistor RTD bias current Bipolar or Unipolar output current operation High and Low Temperature Limits Auxiliary temperature sensor input Anal...

Page 2: ...t A offset T R µ 3 2 3 2 W AMPS RS 232 ADDRESS VOLTS ON P ACT T LIM I AUX T TE V SET T TE I B C I A D ERROR C k HOLD SHIFT FOR OUTPUT SHIFT MODEL LFI 3751 STATUS TEMP LIMIT REMOTE T LIMIT LIMIT I SENSOR Off On Status Section 4 Digit Display Display Select Switch Sensor Reference Section AC Power Switch Digi Pot Adjust Knob Display Section Units of Measure Shift Button Output Section Temp Limit But...

Page 3: ...CORRECTED NO YES YES NO PRESS OUTPUT BUTTON SENSOR ERROR LED flashes Sensor is either OPEN or SHORTED Output forced OFF Press Output Button to re enable output current Press Output Button to clear error Sensor Error LED Correcting the Sensor Error T LIMIT ON OUTPUT OVER UNDER TEMPERATURE CONDITION CORRECTED ON OUTPUT BEEP 3 BEEPS LONG BEEP OVER UNDER TEMPERATURE CONDITION CORRECTED YES NO YES NO P...

Page 4: ...emote RS 232 LED A solid RS 232 LED indicates the instrument is under remote RS 232 control but communication between computer and instrument is not active RS 232 REMOTE SHIFT BEEP BEEP Continuously Hold the Shift Button After 3 seconds REMOTE RS 232 LED lights solid red unit beeps RS 232 Address Displayed while Shift Button is held When Button released new address if changed is saved and unit bee...

Page 5: ...he Temperature Setpoint to your desired operating temperature P ACT T LIM I AUX T TE V SET T TE I B C I A D AMPS P ACT T LIM I AUX T TE V SET T TE I B C I A D AMPS Negative LIM I Positive LIM I 5 00 to 0 00 Amps decrease increase 0 00 to 5 00 Amps Ω P ACT T LIM I AUX T TE V SET T TE I B C I A D C k temperature C or resistance kΩ displayed 199 9 C to 199 9 C or 0 to 500 kΩ decrease increase Continu...

Page 6: ...ptimization will abort See Page 23 for more detail on the LFI 3751 Autotune feature The Front Panel at a Glance Quick Autotune PID Operation Quick Autotune PID Operation continued P ACT T LIM I AUX T TE V SET T TE I B C I A D decrease increase AutS or Autd below 0 ON PRESS RELEASE ON Output Current Disabled Autotune Optimization in Progress ON LED flashes Autotune Complete BEEP Phase 1 The LFI 375...

Page 7: ...AMPS 12 0 to 12 0 Volts VOLTS 199 9 C to 199 9 C OR 0 to 500 k Ω 5 00 to 5 00 Amps AMPS 199 9 C to 199 9 C OR 0 to 500 k Ω C k Ω OR OR C k Ω C P ACT T SET T TE I LIM I AUX T 0 00 to 5 00 Amps 5 00 to 0 00 Amps TE V A SHIFT ON Thermistor RTD AD590 LM335 10 C 1 2 3 25 C 0 C 1 µA K 10 mV K 19 9 kΩ 1 2 3 10 kΩ 0 100 kΩ 40 C 100 C 0 µA 0 mV 5 326 kΩ 0 139 kΩ Default Sensor Configuration The Front Panel...

Page 8: ...ion install a 1000 maT 5 x 20 mm SLO BLO fuse AC Power Entry Module Use only the power cable provided Ensure that the power source you plug the LFI 3751 into is properly grounded 1 9 Serial Number Fan Vent Holes Do Not Block or place any objects within 6 of the rear panel of this instrument 1 25 25 1 13 13 14 14 Earth Ground If your AC power system does not bring earth ground through the AC Power ...

Page 9: ...e 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 temperature controller specifications If your LFI 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 3...

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Page 11: ...e with an AD590 45 Controlling Temperature with an LM335 48 Controlling Temperature with an LM35 51 Sensor Error Condition 55 Setting Limit Currents 56 Setting Temperature Limits 57 Manually Setting the P I and D Constants 58 Setting Operating Temperature or Resistance 60 Enabling Output Current 61 Measuring Thermoelectric Current and Voltage 62 Measuring Auxiliary Thermistor Temperature 63 Settin...

Page 12: ...sor Temperature 103 Setting Gain for Analog Input Signal Rear Panel BNC Connector 104 Checking the Alarm Status 105 Halting the Processor 106 Reverting to LOCAL Mode 107 Entering the PASSWORD 108 Reading Serial Model Numbers Firmware Version 109 Calibration Sensor Bias Current and AD590 Sense Resistance 110 Calibration ACT T TE I TE V uncalibrated voltages 112 Calibration Measurement Slopes Offset...

Page 13: ...1 Chapter 1 Quick Start 13 1 ...

Page 14: ...iliar with the temperature controller by following the Nine Steps to Operating the LFI 3751 for a thermoelectric load with a 10 kΩ thermistor temperature sensor Later chapters expand on this information and offer complete reference information 14 Chapter 1 Quick Start ...

Page 15: ...sure 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 controller is ready for normal operation The line voltage is set to the proper value for your country when the temperatu...

Page 16: ... returning the unit to Wavelength for repair 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 t...

Page 17: ...at 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 kΩ thermistor with 10 C 25 C and 40 C will offer a wide range of operation as well as 0 01 C accuracy Rotate the D...

Page 18: ...and the lowest temperature is used as the Low T LIMIT Chapter 1 Quick Start Nine Steps to Operating the LFI 3751 Set Limit Current 3 With the output off set the limit current 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 I with the Shift Button OFF The positive an...

Page 19: ...ents with the Digi Pot Adjust Knob 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 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...

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Page 21: ...2 Chapter 2 Front Panel Operation 21 2 ...

Page 22: ...ete 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 ...

Page 23: ...plete 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 ...

Page 24: ...nt 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...

Page 25: ...ons 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 Temp Time Before Autotune After Autotune Starts in opposite direction because of right hand zero NOTE Sometimes thermal loads behave...

Page 26: ...ize your system without an integrator If I K 0 Autotune will optimize your system with the integrator function Rotate the Display Select Switch to D Shift Button ON Rotate the Digi Pot Adjust Knob to change the value displayed If D 0 Autotune will optimize your system without a differentiator If D K0 Autotune will optimize your system with the differentiator function Refer to pages 30 31 for a dis...

Page 27: ...m without an integrator If I K 0 Autotune will optimize your system with the integrator function Rotate the Display Select Switch to D Shift Button ON Rotate the Digi Pot Adjust Knob to change the value displayed If D 0 Autotune will optimize your system without a differentiator If D K 0 Autotune will optimize your system with the differentiator function Refer to pages 30 31 for a discussion of th...

Page 28: ...te 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 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 PRESS RELEASE ON Output Current Di...

Page 29: ...ential cannot be achieved E003 Error 3 Non uniform TE I Step Measured It is critical that the step current TE I remain constant throughout the Autotune parameter measurements for L Rmax andT If the output current is limited because the compliance voltage of the LFI 3751 has been reached the step current will not be uniform Correction Reduce the current limit or use a thermoelectric with a lower vo...

Page 30: ... 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...

Page 31: ...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 temperatur...

Page 32: ...d 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 accelerato...

Page 33: ...ional 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 Rmax and the load s thermal time constant T for a given output step curr...

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Page 35: ...clear a Sensor Error 1 9 4 5 Thermistor 2 Automatic Bias Current A fixed bias current IBIAS flows from pin 5 through the thermistor and back into pin 4 to produce a voltage VT As the thermistor resistance RT changes the voltage changes VT must be maintained between 0 and 5 V for proper operation The LFI 3751 automatically ranges between four bias currents 10 µA 100 µA 1 mA and 10 mA to optimize fe...

Page 36: ...Thermistors 36 3 Thermistor Temperature vs Resistance Temperature can be determined by the Steinhart Hart equation given the thermistor resistance and the equation coefficients χ1 χ2 and χ3 To calculate the Steinhart Hart coefficients the LFI 3751 needs three Temperature Resistance data pairs Enter A T1 R1 B T2 R2 and C T3 R3 through the front panel or A1 A2 B1 B2 C1 and C2 via the RS 232 interfac...

Page 37: ...stance 199 9 19 99 1 999 10 00 100 0 0 10 00 100 0 to to to to to to to to 20 0 C 2 00 C 9 999 C 99 99 C 199 9 C 9 999 kΩ 99 99 kΩ 499 9 kΩ Ω P ACT T LIM I AUX T TE V SET T TE I B C I A D C k decrease increase P ACT T LIM I AUX T TE V SET T TE I B C I A D Adjust C Enter T3 C1 Enter R3 C2 6 Entering Data Pair C Rotate the Display Select Switch to C Shift Button ON to display the third data pair Rot...

Page 38: ... to SET T Shift Button OFF If 0 000 0 000 has been entered for A 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 a...

Page 39: ...n when switching from one bias current to another P ACT T LIM I AUX T TE V SET T TE I B C I A D VRTD IBIAS RRTD 39 2 Default RTD Configuration A1 A2 B1 B2 C1 C2 1 000 1 000 0 00 C 0 100 kΩ 100 00 C 0 139 kΩ A B C T1 R1 T2 R2 Bias Current and Sensor Resistance 25 kΩ 2 5 kΩ 0 25 kΩ 0 kΩ 10 µA 100 µA 1 mA 10 mA Resistance Range Sensor Current 500 kΩ 45 kΩ 4 5 kΩ 0 45 kΩ to to to to VRTD Voltage acros...

Page 40: ...mes the RTD temperature response to be linear Enter two Temperature Resistance data pairs B T1 R1 and C T2 R2 R0 resistance at 0 C and alpha are calculated to derive temperature from the measured RTD resistance RRTD All resistances are in ohms and T is in C Note that R0 is typically the resistance the RTD is known by i e a 100 Ω RTD is usually 100 Ω at 0 C R0 R2 T2 R2 R1 T2 T1 alpha a R 2 R 1 R 0 ...

Page 41: ...he LFI 3751 will use the Callendar Van Dusen coefficients if T1 0 C T2 100 C and R2 Φ R1 Φ is listed in the table above The following table shows what should be entered for a 100 Ω RTD that follows each of the standardized curves Callendar Van Dusen Curve Fit T β1 R1 β1 R1 2 4 β2 R1 R1 RRTD 2 β2 R1 Temperature will be calculated using the first two coefficients β1 β2 Coefficient β3 is not used but...

Page 42: ...lternate 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 P ACT T LIM I AUX T TE V SET T TE I B C I A D C decrease increase P ACT T LIM I AUX T TE V SET T TE I B C I ...

Page 43: ...isplaying Actual RTD Temperature Rotate the Display Select Switch to ACT T Shift Button OFF to display the RTD temperature RS 232 Command ACT T 8 Displaying Actual RTD Resistance Enter 1 000 1 000 for A and 0 000 0 000 for B to have the LFI 3751 display RTD resistance kΩ when theDisplay Select Switch is rotated to ACT T Shift Button OFF RS 232 Command ACT R Ω P ACT T LIM I AUX T TE V SET T TE I B ...

Page 44: ...CT T LIM I AUX T TE V SET T TE I B C I A D C decrease increase 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 ...

Page 45: ...is 1 µA Kelvin and the Offset is 0 µA 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 P ACT T LIM I AUX T TE V SET T TE I B C I A D IAD590 bAD590 mAD590 T 273 15 45 Default AD590 Configuration 2 000 2 000 1 000 µA K 0 00 µA A B C Slope Offset A1 A2 B1 C1 Key to accurately measuring and controlling temperature with an AD590 is properly en...

Page 46: ... B and C are saved in non volatile memory RS 232 Command B1 Slope Display Resolution Slope 0 100 to 9 999 µA K 46 Ω P ACT T LIM I AUX T TE V SET T TE I B C I A D C k decrease increase P ACT T LIM I AUX T TE V SET T TE I B C I A D Adjust A Enter A1 Enter A2 3 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 indic...

Page 47: ...M I AUX T TE V SET T TE I B C I A D decrease increase Adjust C Enter Offset C1 5 Entering Data Point C Rotate the Display Select Switch to C Shift Button ON to display the AD590 Offset in µA Rotate the Digi Pot Adjust Knob to change the value Factory default is 0 µA 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 P ...

Page 48: ...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 2 Temperature vs ...

Page 49: ...nge 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 003 000 A2 003 000 P ACT T LIM I AUX T TE V SET T TE I B C I A D decrease increase Adjust B Enter Slope B1 4 Entering Data Point B Rotate the Display Select Switch to B Shift Button ON to display the Slope in mV Kelvin Rotate the Digi Pot Adjust Knob to ...

Page 50: ... TE I B C I A D C SHIFT 6 Displaying Actual LM335 Temperature Rotate the Display Select Switch to ACT T Shift Button OFF to display the LM335 temperature RS 232 Command ACT T 199 9 19 99 100 0 to to to 20 0 C 99 99 C 199 9 C Display Actual LM335 Temperature Display Resolution 7 Adjusting LM335 Temperature Setpoint Rotate the DisplaySelect Switch to SET T ShiftButton OFF Temperature will be display...

Page 51: ...aracterize 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 2 Temperature vs LM35 Voltage The LM35 produces a voltage that changes linearly with temperature in Celcius The LFI 3751 requires a Slope and...

Page 52: ... A1 004 000 A2 004 000 P ACT T LIM I AUX T TE V SET T TE I B C I A D decrease increase Adjust B Enter Slope B1 4 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 for a 10 mV C slope A B and C cannot be adjusted while the output is on Data for A B and C are sa...

Page 53: ...B C I A D C SHIFT 6 Displaying Actual LM35 Temperature Rotate the Display Select Switch to ACT T Shift Button OFF to display the LM35 temperature RS 232 Command ACT T 199 9 19 99 100 0 to to to 20 0 C 99 99 C 199 9 C Display Actual LM35 Temperature Display Resolution 7 Adjusting LM35 Temperature Setpoint Rotate the Display Select Switch to SET T Shift Button OFF Temperature will be displayed To ad...

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Page 55: ...dicate 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 Chapter 2 Front Panel Operation Sensor Error Condition Sensor Error Condition SENSOR Thermistor RTD AD590 LM335 LM35 Low Sensor Er...

Page 56: ... 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 flashing A lower Limit Current will increase the settling time since less power is delivered to the t...

Page 57: ...e 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 aga...

Page 58: ...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 P ACT T LIM I AUX T TE V SET T TE I B C I A D decrease increase 1 Adjusting the P Term Rotate the Display Select Switch to P Shift Button ON Rotate the Digi Pot Ad...

Page 59: ...ntegral Time Constant OFF ON Integral Time Constant Range 0 0 0 4 to 10 seconds 3 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 Command D Increasing the differentiator time constant also improves the instrument s control loop stability The differentiator term is typically only useful or necessary for ...

Page 60: ... 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 SET T SET R Chapter 2 Front Panel Operation Setting Operating Temperature or Resistance Setting Operating Temperature or Resistance Display Setpoint Temperature or Resistance Default Setpoints 25 C 10 kΩ SET T SET R P ACT T LIM I AUX T TE V SET T TE I B C I A D SET ...

Page 61: ...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 4 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 5 Clearing E...

Page 62: ...2 Command TE V P ACT T LIM I AUX T TE V SET T TE I B C I A D AMPS Measuring Thermoelectric Current Rotate the Display Select Switch to TE I 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 ...

Page 63: ...iring the Output Connector Wire the thermistor to the output connector on the rear panel 1 9 4 3 10 k Ω Thermistor Wavelength part number TCS 610 Auxiliary Sensor P ACT T LIM I AUX T TE V SET T TE I B C I A D C 2 Displaying Auxiliary Temperature Rotate the Display Select Switch to AUX T Shift Button OFF to display the auxiliary sensor temperature The decimal point position changes automatically to...

Page 64: ... 4 543 4 368 4 201 4 041 3 888 3 742 3 602 3 468 3 340 3 217 3 099 2 987 2 878 2 775 2 675 2 580 2 489 2 401 2 317 2 236 2 158 2 084 2 012 1 944 1 878 1 814 1 753 1 695 Resistance kΩ 49 67 47 08 44 64 42 34 40 17 38 12 36 20 34 38 32 66 31 04 29 51 28 06 26 69 25 40 24 18 23 02 21 92 20 89 19 90 18 97 18 09 17 26 16 47 15 71 15 00 14 32 13 68 13 07 12 49 11 94 11 42 10 92 10 45 10 00 9 572 9 165 8...

Page 65: ... 3083 0 3005 0 2930 0 2858 0 2787 0 2718 0 2652 0 2587 0 2524 0 2464 0 2404 0 2347 0 2291 0 2236 0 2184 0 2132 0 2082 0 2034 0 1987 0 1941 0 1896 0 1853 Temperature C 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 Resistance kΩ 1 638 1 584 1 532 1 482 1 433 1 387 1 342 1 299 1 258 1 218 1 179 1 142 1 106 1 072 1 0...

Page 66: ...olid to indicate the address is displayed and can be adjusted Continue to hold the Shift Button and rotate the Digi Pot Adjust Knob to change the value from 1 to 99 Release the Shift Button to save the displayed RS 232 address The RS 232 address can only be changed via the front panel Chapter 2 Front Panel Operation Setting the RS 232 Address Setting the RS 232 Address Display RS 232 Address Relea...

Page 67: ...ge of 8 Volts at 5 Amps select a low value resistive heater to use the maximum power from the LFI 3751 Chapter 2 Front Panel Operation Operating with Resistive Heaters Operating with Resistive Heaters 9 2 1 Resistive Heater Resistive Heater operation is similar to operation with thermoelectrics except only heating current is delivered to a resistive heater 67 2 ...

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Page 69: ...3 Chapter 3 Rear Panel Operation 69 3 ...

Page 70: ...Rear Panel Operation This chapter details the sections of the rear panel and provides pinouts for all connectors 70 Chapter 3 Rear Panel Operation ...

Page 71: ...onnect the sensor between pins 5 4 For an AD590 connect the positive terminal to pin 6 and the negative to pin 5 For an LM35 an external 240 kΩ resistor is required See Chapter 2 for individual sections that detail the sensor usage 1 9 5 6 1 2 3 4 5 6 7 8 9 TEC TEC Aux Sensor Sensor Main Sensor AD590 Voltage Fan Fan 12 V 12 V Output Connector 9 pin male D sub plug AD590 TO 52 package 1 9 5 6 case ...

Page 72: ...d controlled from one RS 232 port on a computer RS 232 Input 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 Bottom View GND Vout Vs 8 240 kΩ for either package GND Vout Vs to pin 8 to pin 5 to pin 4 TO 92 plastic package 1 9 4 5 LM35 TO 46 me...

Page 73: ...ischarge The transfer functions change according to the sensor type and bias current Thermistors RTDs 10 µA or 100 µA Thermistors RTDs 1 mA or 10 mA LM335 35 AD590 Thermocouples 10 kΩ V 100 Ω V 10 C V Analog Input Transfer Functions Analog Input BNC BNC Connector Used with Analog Version only Chapter 3 Rear Panel Operation BNC Connector Example With a thermistor biased with 100 µA if SET R is 12 k...

Page 74: ... maT fuse 5 x 20 mm SLO BLO fuse 2 AC Voltage Select Switch The Voltage Select Switch configures 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 t...

Page 75: ...3 4 Chapter 4 Remote Interface Reference 75 4 ...

Page 76: ...ls 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 76 Chapter 4 Remote Interface Reference ...

Page 77: ...Baud Rate Bit Length Parity Stop Bit Setting 19 2 kbps 8 Bit No Parity 1 Stop Bit RS 232 Communication Settings 1 RS 232 Configuration Overview 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 Connector on the rear panel of the first unit to the ...

Page 78: ...ub Shell on LFI 3751 is connected to chassis Always properly earth ground the LFI 3751 chassis through your AC power system LFI 3751 First Unit RS 232 Input Connector Instrument Receive In Instrument Transmit Out Signal Ground D Sub SHELL DB 9 to DB 25 RS 232 Wavelength Cable CRS 801 6 feet 1 2 3 4 5 6 7 8 20 SH DB 9 Serial Connection Protective Ground Transmit Data Out Receive Data In Request to ...

Page 79: ... Unit RS 232 Input Connector Instrument Receive In Instrument Transmit Out Signal Ground D Sub SHELL DB 25 to DB 25 RS 232 Wavelength Cable CRS 802 2 feet 1 2 3 4 5 6 7 8 20 SH DB 25 Male DB 25 Female DB 25 Male DB 25 Female 1 25 25 1 4 RS 232 Connector Pinouts RS 232 Input 25 pin female D sub receptacle 2 3 7 5 6 8 20 shorted Instrument Receive In Instrument Transmit Out Signal Ground RS 232 Outp...

Page 80: ...l 19200 baud capacity If the host computer can t buffer the instrument s Response Packets at full speed configure the host computer s RS 232 port for XON XOFF flow control When a value is written to the instrument in a Command Packet the corresponding Response 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 ...

Page 81: ...f 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...

Page 82: ...moelectric Current Measurement Thermoelectric Voltage Measurement Positive Current Limit 000 000 to 005 000 Amps Negative Current Limit 005 000 to 000 000 Amps Auxiliary Sensor Temperature Measurement Proportional Gain 002 000 Setpoint Response Autotune 001 000 Disturbance Rejection Autotune 000 000 to 100 000 Amps Volt Integral Time Constant 000 000 OFF or 000 400 to 010 000 sec Differentiator Ti...

Page 83: ...0 µA bias current Char 7 Sign Char manual automatic Char 6 Not Used Char 5 Not Used Char 4 Not Used Char 3 Decimal Point Char 2 Mod Gain 3 100 1 0 OFF 1 ON Char 1 Mod Gain 2 10 1 0 OFF 1 ON Char 0 Mod Gain 1 1 1 0 OFF 1 ON 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 Erro...

Page 84: ... 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 Enter or read unit serial number PASSWORD required to enter serial number Read firmware version Read Model Number Description and Data Field Range These Command and Response Packets violate the XXX XXX data format The data field is used for eight A...

Page 85: ... current in mA Enter actual 10 kΩ resistance for sensing AD590 current in kΩ Measure uncalibrated ACT T voltage in Volts Measure uncalibrated TE I voltage in Volts Measure uncalibrated TE V voltage in Volts Calibrate ACT T slope Calibrate ACT T offset Calibrate TE I slope Calibrate TE I offset Calibrate TE V slope Calibrate TE V offset Calibrate positive SET T slope Calibrate positive SET T offset...

Page 86: ...button 0 OFF 1 ON Char 1 Shift Pushbutton 0 OFF 1 ON Char 0 Output Pushbutton 0 OFF 1 ON Rotary Switch Status A 1 indicates position of rotary switch Char 7 Sign Char Not Used Returns Char 6 AUX T C Char 5 LIM I B Char 4 TE V A Char 3 Decimal Point Char 2 TE I D Char 1 SET T I Char 0 ACT T P Read Digi Pot counter Char 7 Sign Char clockwise counterclockwise Char 6 5 4 Integer Number of Interrupts s...

Page 87: ...t 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 Dat...

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Page 89: ...dicate the address is displayed and can be adjusted Continue to hold the Shift Button and rotate the Digi Pot Adjust Knob to change the value from 1 to 99 Release the Shift Button to save the displayed RS 232 address The RS 232 address can only be changed via the front panel Display RS 232 Address Release the SHIFT Button to save the displayed RS 232 address Then simply send a Command Packet to th...

Page 90: ...e 101221 010 00024 Sets A1 101222 019 90027 Sets A2 101223 025 00020 Sets B1 101224 010 00021 Sets B2 101225 040 00025 Sets C1 101226 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 101121 000 00026 Reads A1 101122 ...

Page 91: ...ype Sensor Type Slope Offset Sensor Type Sensor Type Slope Offset Sensor Type Sensor Type Slope Offset Data Range 199 900 to 199 900 C 000 000 to 499 900 kΩ 199 900 to 199 900 C 000 000 to 499 900 kΩ 199 900 to 199 900 C 000 000 to 499 900 kΩ 001 000 001 000 199 900 to 199 900 C 000 000 to 499 900 kΩ 199 900 to 199 900 C 000 000 to 499 900 kΩ 002 000 002 000 000 100 to 009 999 µA K 009 990 to 009 ...

Page 92: ...ack 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 µA Write 101241 000 00122 Sets Sensor Bias to manual 10 µA for an NTC sensor This command is helpful for configuring the instrument for use with non standard temperature sensors The following tab...

Page 93: ...ng 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 cha...

Page 94: ...e or Resistance To measure actual sensor temperature from an instrument send the following Command Packet Read 101101 000 00024 Reads ACT T in C To measure actual sensor resistance from an instrument send the following Command Packet Read 101102 000 00027 Reads ACT R in kΩ RS 232 Commands Discussed ACT T ACT R ...

Page 95: ...ent s limit current settings the Command Type changes from a WRITE 2 to a READ 1 Read 101107 000 00022 Reads LIM I POSITIVE in Amps 101108 000 0002D Reads LIM I NEGATIVE in Amps LIM I POSITIVE ranges from 000 000 to 005 000 Amps LIM I NEGATIVE ranges from 005 000 to 000 000 Amps To Configure for a Resistive Heater Set LIM I POSITIVE to 000 000 Amps to operate a resistive heater For complete detail...

Page 96: ...0021 Sets T LIM HIGH in C 101232 000 00027 Sets T LIM LOW in C To read the current temperature limits the Command Type changes from a WRITE 2 to a READ 1 Read 101131 000 00027 Reads T LIM HIGH in C 101132 000 00024 Reads T LIM LOW in C Temperature Limits range from 199 900 to 199 900 C The temperature limits are disabled when thermistors or RTDs are configured to display resistance rather than tem...

Page 97: ... the instrument as a PI controller with P 30 and I 1 second send the following Command Packets Write 101210 030 00024 Sets P to 30 101211 001 00027 Sets I to 1 second 101212 000 00025 Sets D to OFF For complete details about Autotune PID operation see Chapter 2 For complete detail about setting the P I and D constants see Chapter 2 The LFI 3751 with Autotune PID can optimize the PID control parame...

Page 98: ...llowing Command Packets Write 101210 030 00024 Sets P to 30 101211 001 00027 Sets I to 1 second 101212 001 00024 Sets D to 1 second To read the P I and D constants the Command Type changes from a WRITE 2 to a READ 1 Read 101110 000 00024 Reads P 101111 000 00025 Reads I 101112 000 00026 Reads D P ranges from 001 000 to 100 000 I ranges from OFF 000 000 or 000 400 to 010 000 seconds D ranges from O...

Page 99: ... send the following Command Packet Write 101203 035 00023 Sets SET T To read the instrument s setpoint temperature the Command Type changes from a WRITE 2 to a READ 1 Read 101103 000 00026 Reads SET T in C Temperature Setpoint ranges from 199 900 to 199 900 C For complete detail about setting the Operating Temperature see Chapter 2 RS 232 Commands Discussed SET T ...

Page 100: ...rface Reference Setting Resistance Setpoint Setting Resistance Setpoint To use resistance as the setpoint you must be using a resistive sensor thermistor or RTD The following table shows the configuration settings and Command Packets to set the configuration for a thermistor or RTD in resistance mode How to Configure Thermistor and RTD for Resistance Setpoint Sensor Type Thermistor RTD Configurati...

Page 101: ...The following table details the structure of the characters returned in the data field For complete detail about Enabling the Output Current see Chapter 2 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 I step measured 4 Rate Sign Change Char 4 Autotune Status 0 Normal Operation 1 Autotune Opera...

Page 102: ...suring thermoelectric current and voltage see Chapter 2 To measure the thermoelectric current out of the instrument send the following Command Packet Read 101105 000 00020 Reads TE I in Amps To measure the thermoelectric voltage out of the instrument send the following Command Packet Read 101106 000 00023 Reads TE V in Volts RS 232 Commands Discussed TE I TE V ...

Page 103: ...liary Sensor Temperature For complete detail about measuring temperature with the auxiliary sensor see Chapter 2 To measure temperature of the auxiliary 10 kΩ thermistor wired to the instrument send the following Command Packet Read 101109 000 0002C Reads AUX T in C RS 232 Commands Discussed AUX T ...

Page 104: ... Panel BNC Connector The instrument automatically sets the gain of the Analog Input Connector to match your sensor and bias current configuration You can manually 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 101242 000 10021 Sets Analog Input Gain to manual 100 1 The following table details...

Page 105: ... following Command Packet Read 101135 000 00023 Reads Alarm Status The following table details the structure of the characters 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 ...

Page 106: ...pts 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 101252 000 00021 Halts Processor You have to power off the instrument for 30 seconds before resuming operation No Response Packet is returned when this command is executed RS 232 Commands Discussed HALT PROCESSOR ...

Page 107: ... Mode To switch from computer to front panel control of the instrument use the LOCAL command To revert to LOCAL mode send the following Command Packet Write 101253 000 00020 LOCAL Before reverting to LOCAL mode the instrument will return a Response Packet RS 232 Commands Discussed LOCAL ...

Page 108: ... FCS PASSWORD This data field does not follow the standard format These eight characters are only restricted to ASCII characters The PASSWORD can be obtained by calling Wavelength Electronics Technical Support or your local distributor 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 Chara...

Page 109: ... read the instrument s Serial Number send the following Command Packet Read 101155 000 00025 Reads Serial Number XXXXXXXX To read the instrument s Firmware Version send the following Command Packet Read 101156 000 00026 ReadsFirmware Version XXXXXXXX To read the instrument s Model Number send the following Command Packet Read 101157 000 00027 Reads Model Number XXXXXXXX should return LFI 3751 RS 2...

Page 110: ...ce Current If the instrument s 10 µA reference current is actually 9 89 µA send the following Command Packet to properly calibrate the unit Write 101261 009 89029 10 µA BIAS CAL in µA Calibrating the 100 µA Reference Current If the instrument s 100 µA reference current is actually 99 5 µA send the following Command Packet to properly calibrate the unit Write 101262 099 50027 100 µA BIAS CAL in µA ...

Page 111: ...27 AD590 10 kΩ CAL in kΩ Reading the Sensor Bias Current and AD590 Sense Resistance Settings 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 101161 000 00022 Reads 10 µA BIAS CAL in µA 101162 000 00021 Reads 100 µA BIAS CAL in µA 101163 000 00020 Reads 1 mA BIAS CAL in mA 101164 000 00027 Reads 10 mA B...

Page 112: ...librated TE I voltage This command reads the uncalibrated TE I voltage from the instrument s A D This command is useful for calculating the instrument s TE I Slope and Offset To read the uncalibrated TE I voltage send the following Command Packet Read 101172 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...

Page 113: ...are used to calculate the instrument s ACT T measurement Write 101274 001 00024 ACT T SLOPE CAL 101275 000 00024 ACT T OFFSET CAL in Volts Calibrating TE I Slope Offset These commands are used to calculate the instrument s TE I measurement Write 101276 001 00026 TE I SLOPE CAL 101277 000 00026 TE I OFFSET CAL in Amps Calibrating TE V Slope Offset These commands are used to calculate the instrument...

Page 114: ...SSWORD is required Read 101174 000 00026 Reads ACT T SLOPE CAL 101175 000 00027 Reads ACT T OFFSET CAL in Volts 101176 000 00024 Reads TE I SLOPE CAL 101177 000 00025 Reads TE I OFFSET CAL in Amps 101178 000 0002A Reads TE V SLOPE CAL 101179 000 0002B Reads TE V OFFSET CAL in Volts Chapter 4 Remote Interface Reference Calibration Measurement Slopes Offsets ...

Page 115: ...LOPE CAL 101281 000 0002F POS SET T OFFSET CAL in Volts Calibrating Negative SET T Slope Offset These commands calibrate the negative voltage SET T setpoints Write 101282 001 0002D NEG SET T SLOPE CAL 101283 000 0002D NEG SET T OFFSET CAL in Volts Reading the Current Calibration Settings To read the current calibration settings the Command Type changes from a WRITE 2 to a READ 1 and no PASSWORD is...

Page 116: ...E CAL 101285 000 0002B TE POS LIM I OFFSET CAL in Amps Calibrating LIM I NEGATIVE Slope Offset These commands calibrate the negative limit current settings Write 101286 001 00029 TE NEG LIM I SLOPE CAL 101287 000 00029 TE NEG LIM I OFFSET CAL in Amps Reading the Current Calibration Settings To read the current calibration settings the Command Type changes from a WRITE 2 to a READ 1 and no PASSWORD...

Page 117: ...ack to the default settings send the following Command Packets Write 101254 FCS PASSWORD 101288 000 00026 RESTORE FACTORY CALIBRATION DEFAULTS NOTICE This command will clear the calibration E2 PROM and clear any previous calibration values All slopes will reset to 1 and offsets to 0 The sensor bias currents will become 10 µA 100 µA 1 mA and 10 mA The AD590 sense resistance returns to 10 kΩ The ser...

Page 118: ...Unit of Measure Shift LEDs send the following Command Packet Write 101291 000 1002F Turns on Unit of Measure Shift LEDs Once the Command Packet is executed the test state will be repeated until the instrument is returned to normal operation To return the instrument to normal operation either turn off the power or send a Command Packet with a in Character 7 Char 7 Sign Char manual automatic Char 6 ...

Page 119: ...e characters in the data field for the ROTARY SWITCH STATUS command A 1 indicates the position of the rotary switch To read the current status of the Rotary switch send the following Command Packet Read 101193 000 0002F Reads 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 Pushb...

Page 120: ... 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 To read the current status of the Digi Pot send the following Command Packet Read 101194 000 00028 Reads DIGIPOT STATUS 120 Chapter 4 Remote Interface Reference Diagnostic Digi Pot St...

Page 121: ... an illegal ASCII digit The Command Code can accept 00 through 99 FCS is a HEX number so can accept 00 through FF 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 0 must contain a valid ASCII digit 0 through 9 20 Command Code does not support Comman...

Page 122: ...tly 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 Packet is 999 999 This occurs when the sensor is...

Page 123: ...EN 1250 FCS FCS XOR ASC MID Packet IFCS 1 1260 Next 1270 FCS RIGHT 0 HEX FCS 2 1280 IF STARTCHAR and FCS MID Packet 18 2 THEN FCSVALID FALSE The following Visual C routine calculates the FCS for a Command or Response Packet static BYTE ComputeFCS const CString srPreFcsCmd BYTE ucFCS 0 zero FCS byte For debugging Validate CString object reference is to the first part of a Command or Response Packet...

Page 124: ...DOM 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 f...

Page 125: ...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 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 fr...

Page 126: ...N 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 4 Remote Interface Reference Example BA...

Page 127: ...5 Chapter 5 Specifications 127 5 ...

Page 128: ...Specifications This chapter details the General Electrical and Mechanical Specifications of the LFI 3751 Temperature Controller Chapter 5 Specifications 128 ...

Page 129: ...ean with dry lint free cloth 0 002 C 0 005 C 12 bit D to A 5 0 A 8 V 40 W 0 to 5 0 A 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 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 adjust...

Page 130: ...ecifications Mechanical Specifications SENSOR Wavelength Electronics 5 Amp 40 Watt Temperature Controller B A C P ACT T LIM I AUX T TE V SET T TE I B C I A D OUTPUT MODEL LFI 3751 STATUS 6 50 165mm 7 10 180mm 12 00 305mm 12 65 321mm 4 25 108 mm ...

Page 131: ...Appendix CAT 220 Cable Accessory Diagram 131 ...

Page 132: ...ram Appendix CAT 220 Cable Accessory Diagram CAT 220 Pin 1 2 3 4 5 6 7 8 9 SHELL Description TEC TEC Aux Sensor Sensor Main Sensor AD590 Voltage Fan Fan 12 V 12 V Wire color RED BLACK BROWN GREEN WHITE ORANGE YELLOW BLUE PURPLE SLATE ...

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