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ILX Lightwave LDT-5940C
User Manual
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Newport ILX Lightwave LDT-5910C, ILX Lightwave LDT-5940C User Manual

User’s Guide
Thermoelectric Temperature Controllers
LDT-5910C LDT-5940C
70045102 March 2019
Table of Contents
Safety Information and the Manual ............................................................................. v
General Safety Considerations ................................................................................... v
Safety Symbols .......................................................................................................... vi
Safety Marking Symbols ........................................................................................... vii
Warranty ................................................................................................................... vii
Limitations ................................................................................................................ vii
Returning an Instrument .......................................................................................... viii
Comments, Suggestions, and Problems ................................................................... ix
Chapter 1: Introduction and Specifications ................................................. 1
Safety Considerations ................................................................................................ 1
Initial Inspection .......................................................................................................... 1
Shipping Kit ................................................................................................................ 1
Product Overview ....................................................................................................... 2
Options and Accessories ............................................................................................ 5
Specifications ............................................................................................................. 6
Chapter 2: General Operation ..................................................................... 9
Grounding Requirements ........................................................................................... 9
AC Line Power Requirements .................................................................................... 9
The Power Up Sequence ........................................................................................... 9
Firmware Upgradeability ........................................................................................... 10
GPIB Communication ............................................................................................... 10
USB Communication ................................................................................................ 10
Tilt Foot Adjustment .................................................................................................. 10
Rack Mounting .......................................................................................................... 10
Connections .............................................................................................................. 11
Front Panel Operation .............................................................................................. 13
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General Operating Procedures ................................................................................. 17
Constant Temperature Mode Operation ................................................................... 22
Constant Sensor Mode Operation ............................................................................ 22
Constant Current Mode Operation ............................................................................ 24
Resistive Heater Mode Operation ............................................................................. 24
Chapter 3: Remote Operation ................................................................... 25
GPIB Address ........................................................................................................... 25
Basic GPIB Concepts ............................................................................................... 25
Basic USB concepts ................................................................................................. 28
Changing Between Local and Remote Operation ..................................................... 29
GPIB vs. USB Communication ................................................................................. 29
Command Syntax ..................................................................................................... 29
Command Tree Structure ......................................................................................... 32
Syntax Summary ...................................................................................................... 33
IEEE 488.2 Common Commands ............................................................................. 34
Status Reporting ....................................................................................................... 35
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Operation Complete Definition .................................................................................. 36
Output Off Register ................................................................................................... 38
Command Timing ..................................................................................................... 39
Sequential / Overlapped Commands ........................................................................ 39
Query Response Timing ........................................................................................... 39
Chapter 4: Command Reference ............................................................... 41
Remote Command Reference Summary .................................................................. 41
LDT-5910B Compatibility for LDT-5910C ................................................................. 44
Command Reference ............................................................................................... 45
Chapter 5: Calibration and Troubleshooting ............................................. 65
Troubleshooting Guide ............................................................................................. 66
Error Messages ........................................................................................................ 69
Calibration Overview ................................................................................................ 71
Appendix A: AD590 and LM335 Sensor Calibration ................................. 77
AD590 Sensor .......................................................................................................... 77
LM335 Sensor .......................................................................................................... 78
One Point Calibration Method ................................................................................... 79
Two Point Calibration Method ................................................................................... 79
Appendix B: Auto-Tune Method ................................................................ 81
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Safety and Warranty Information
Details about cautionary symbols Safety markings used on the instrument Information about the warranty Customer service contact information
Safety Information and the Manual
Throughout this manual, you will see the words Caution and Warning indicating potentially dangerous or hazardous situations which, if not avoided, could result in death, serious or minor injury, or damage to the product. Specifically:
Caution indicates a potentially hazardous situation which can result in minor or moderate injury or damage to the product or equipment.
Warning indicates a potentially dangerous situation which can result in serious injury or death.
Visible and/or invisible laser radiation. Avoid direct exposure to the beam.
General Safety Considerations
If any of the following conditions exist, or are even suspected, do not use the instrument until safe operation can be verified by trained service personnel:
 Visible damage  Severe transport stress  Prolonged storage under adverse conditions  Failure to perform intended measurements or functions
If necessary, return the instrument to ILX Lightwave, or authorized local ILX Lightwave distributor, for service or repair to ensure that safety features are maintained.
All instruments returned to ILX Lightwave are required to have a Return Authorization Number assigned by an official representative of ILX Lightwave Corporation. See Returning an Instrument for more information.
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Safety Symbols
This section describes the safety symbols and classifications.
Technical specifications including electrical ratings and weight are included within the manual. See the Table of Contents to locate the specifications and other product information. The following classifications are standard across all ILX Lightwave products:
Indoor use only
Ordinary Protection: This product is NOT protected against the harmful ingress of
moisture.
IEC Class I Equipment (grounded type)
Mains supply voltage fluctuations are not to exceed ±10% of the nominal supply voltage.
Pollution Degree II
Installation (overvoltage) Category II for transient over-voltages
Maximum Relative Humidity: <85% RH, non-condensing
Operating temperature range of 10 °C to 40 °C
Storage and transportation temperature of –40 °C to 70 °C
Maximum altitude: 3000 m (9843 ft.)
This equipment is suitable for continuous operation.
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Safety Marking Symbols
This section provides a description of the safety marking symbols that appear on the instrument. These symbols provide information about potentially dangerous situations which can result in death, injury, or damage to the instrument and other components.
Caution, refer to manual
Caution, risk of electric shock
Earth ground Terminal
Protective Conductor Terminal
Alternating current
Caution, hot surface
Visible and/or invisible laser radiation
Frame or chassis terminal
Warranty
ILX Lightwave Corporation warrants this instrument to be free from defects in material and workmanship for a period of one year from date of shipment. During the warranty period, ILX will repair or replace the unit, at our option, without charge.
Limitations
This warranty does not apply to fuses, lamps, defects caused by abuse, modifications, or to use of the product for which it was not intended.
This warranty is in lieu of all other warranties, expressed or implied, including any implied warranty of merchantability or fitness for any particular purpose. ILX Lightwave Corporation shall not be liable for any incidental, special, or consequential damages.
If a problem occurs, please contact ILX Lightwave Corporation with the instrument's serial number, and thoroughly describe the nature of the problem.
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Returning an Instrument
If an instrument is to be shipped to ILX Lightwave for repair or service, be sure to:
Obtain a Return Authorization number (RA) from ILX Customer Service.
Attach a tag to the instrument identifying the owner and indicating the required service or
repair. Include the instrument serial number from the rear panel of the instrument.
Attach the anti-static protective caps that were shipped with the instrument.
Place the instrument in the original packing container with at least 3 inches (7.5 cm) of
compressible packaging material. Shipping damage is not covered by this warranty.
Secure the packing box with fiber reinforced strapping tape or metal bands.
Send the instrument, transportation pre-paid, to ILX Lightwave. Clearly write the return
authorization number on the outside of the box and on the shipping paperwork. ILX Lightwave recommends you insure the shipment.
If the original shipping container is not available, place your instrument in a container with at
least 3 inches (7.5 cm) of compressible packaging material on all sides.
Repairs are made and the instrument returned transportation pre-paid. Repairs are warranted for the remainder of the original warranty or for 90 days, whichever is greater.
Claims for Shipping Damage
When you receive the instrument, inspect it immediately for any damage or shortages on the packing list. If the instrument is damaged, file a claim with the carrier. The factory will supply you with a quotation for estimated costs of repair. You must negotiate and settle with the carrier for the amount of damage.
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Comments, Suggestions, and Problems
To ensure that you get the most out of your ILX Lightwave product, we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support. You may contact us in whatever way is most convenient:
Phone (800) 459-9459 or (406) 586-1244
Fax (406) 586-9405
On the web at: ilx.custhelp.com
Or mail to:
ILX Lightwave Corporation
31950 East Frontage Road
Bozeman, Montana, U.S.A 59715-8642
www.ilxlightwave.com
When you contact us, please have the following information:
Model Number Serial Number End-user Name Company Phone Fax Description of what is connected to the ILX Lightwave instrument Description of the problem
If ILX Lightwave determines that a return to the factory is necessary, you are issued a Return Authorization (RA) number. Please mark this number on the outside of the shipping box.
You or your shipping service are responsible for any shipping damage when returning the instrument to ILX Lightwave; ILX recommends you insure the shipment. If the original shipping container is not available, place your instrument in a container with at least 3 inches (7.5 cm) of compressible packaging material on all sides.
We look forward to serving you even better in the future!
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Chapter 1:
Introduction and Specifications
This chapter is an introduction to the LDT-5910C and LDT-5940C Thermoelectric Temperature Controllers.
Safety Considerations and unpacking information Product Overview Options and accessories Specifications
Safety Considerations
If any of the following symptoms exist, or are even suspected, remove the LDT-5910C or LDT-5940C from service. Do not use the LDT-5910C or LDT-5940C until trained service personnel can verify safe operation.
Visible damage Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions
If necessary, return the LDT-5910C or LDT-5940C to ILX Lightwave for service and repair to ensure that safety features are maintained.
Initial Inspection
When you receive your LDT-5910C or LDT-5940C Thermoelectric Temperature Controller, verity that the following items were shipped with the instrument
LDT-5900C Series Thermoelectric Temperature Controller Manual Power Cord Shipping Kit
Shipping Kit
The shipping kit for the LDT-5910C and LDT-5940C Thermoelectric Temperature Controller includes a USB A/B cable and a CD containing the ILX Lightwave USB Driver.
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Product Overview
The LDT-5910C and LDT-5940C are high performance thermoelectric temperature controllers that offers a flexible, extended temperature control range from -100 °C to +200 °C with a choice of temperature sensors. The LDT-5910C features a linear, bipolar output providing 32 Watts of power to drive most thermal loads. This output stage offers the low current noise necessary to achieve the temperature stability required to meet demanding low noise and frequency­stabilized laser applications. The LDT-5940C features a switching output providing 60 Watts of temperature control power for applications requiring increased cooling or heating capacity. The instruments support thermistor, platinum RTD, and IC temperature sensors. In addition, a unique linearized thermistor mode allows for the use of a standard 10 k thermistor over an extended temperature range from -15 °C to 65 °C. A digital PID control loop delivers fast settling time while maintaining high stability. For quick setup the LDT-5910C and LDT-5940C incorporate pre-programmed PID values for common applications. In addition, a fast auto-tune algorithm is available to automatically adjust the PID constants to support a wide range of thermal loads. The GPIB and USB interfaces ensure trouble-free remote programming and readout.
Features of the LDT-5910C and LDT-5940C include:
Precision setpoint resolution of ±0.01 °C with long term temperature stability of ±0.002 °C
(LDT-5910C) and ±0.003 °C (LDT-5940C)
Unique, linearized thermistor mode allows a standard 10 k thermistor to be used over the
range from -15 °C to 65 °C
Pseudo 4-Wire Sensor and TEC Measurement (LDT-5940C only)
Fully programmable PID control loop with twelve preset PID values
Auto-tune algorithm automatically adjusts PID constants for a wide range of loads
External analog temperature control input
Independent heating and cooling current limits
TE voltage measurement
Heat only control mode
Remote commands in LDT-5910C and LDT-5940C are compatible with LDT-5910B remote
commands
GPIB/IEEE 488 and USB Interfaces
Normally open and normally closed output interlock
Variable speed external fan control
If cleaning is required, use a clean dry cloth. Do not use solvents.
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Figure 1.1 – LDT-5910C and LDT-5940C Front Panel
Figure 1.2 – LDT-5910C Rear Panel
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Figure 1.4 – LDT-5940C Rear Panel
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Options and Accessories
Options and accessories available for LDT-5910C and LDT-5940C Thermoelectric Temperature Controllers include the following:
DESCRIPTION MODEL / PART NUMBER
Single Rack Mount Kit RM-144 Dual Rack Mount Kit RM-145 Temperature Controller Interconnect Cable (terminated with 9-pin DSUB) CC-505S [5910C only] Temperature Controller Interconnect Cable (unterminated) CC-501S [5910C only] 10 Amp TE Interconnect Cable (unterminated without fan connections) CC-591H [5940C only] 10 Amp TE Interconnect Cable (unterminated with fan connections) CC-594H [5940C only] 5 Amp TE/LDM Interconnect Cable (terminated with 9-pin DSUB) CC-595S [5940C only] 10 Amp TE Interconnect Cable (terminated with 7W2 DSUB) CC-596H [5940C only] Calibrated 10 k Thermistor TS-510 Uncalibrated 10 k Thermistor TS-520 Uncalibrated 5 k Thermistor TS-521 Uncalibrated 20 k Thermistor TS-523 Uncalibrated 100 k Thermistor TS-525 Uncalibrated AD590 IC Temperature Sensor TS-530 Uncalibrated LM335 IC Temperature Sensor TS-540 Unipolar Control Adapter UCA-350 TO-Can Laser Diode Mount LDM-4405 TO-Can Laser Diode Mount LDM-4407 C-Mount Laser Diode Mount LDM-4409 TO-Can Laser Diode Mount (with optional collimating lens) LDM-4412 TELECOM Laser Diode Mount LDM-4980 Production TO-Can Laser Diode Mount LDM-4990
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Specifications
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Chapter 2:
General Operation
This chapter is an overview of the operation of the LDT-5910C and LDT-5940C Thermoelectric Temperature Controllers.
Power requirements Front panel operation General operating procedures
Grounding Requirements
The LDT-5910C and LDT-5940C Thermoelectric Temperature Controllers come with a three conductor AC power cable. The power cable must be plugged into an approved three-contact electrical outlet or used with a three-contact to two-contact adaptor with the grounding wire connected to an electrical ground (safety ground). ILX Lightwave recommends connecting the instrument only to properly earth grounded receptacles. The power cord connector and power cable meet IEC safety standards.
AC Line Power Requirements
The LDT-5910C and LDT-5940C Thermoelectric Temperature Controller can be configured to operate at nominal line voltages of either 110 - 120 VAC or 220 - 240 VAC and for the LDT-5910CJ (100V) model 100 – 110 VAC. This is a factory fixed configuration which cannot be changed by the end user. Check to be sure that the voltage indicated on the back panel of the instrument matches the power line voltage in your area.
The Power Up Sequence
Prior to power up ensure the fan inlet located on the right hand side of the instrument has no obstructions that would impede airflow. In addition ensure there is no obstruction in the rear that may impede airflow.
With the LDT-5910C or LDT-5940C connected to an AC power source, pressing POWER supplies AC line power to the instrument and starts the following power up sequence where each display last two to three seconds.
All front panel indicators are ON, all 7-segment displays indicate “8”
All front panel indicators OFF
Display shows the model number, the serial number and the firmware version of the
controller
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During the front panel indicator test, the LDT-5910C and LDT-5940C performs a self-test to ensure that the internal hardware and software are communicating. If the LDT-5910C and LDT-5940C cannot successfully complete the test, an error message is displayed. See Chapter 5 for a complete list of error messages. After the self test, the LDT-5910C and LDT-5940C configuration is set to the same state as when the power was last turned off.
To quickly set a different configuration you can use the recall function. See Store and Recall for more information.
Firmware Upgradeability
The firmware on the LDT-5910C and LDT-5940C can be reinstalled or upgraded via USB. Contact ILX Lightwave technical support for information on upgrading the software of the LDT-5910C and LDT-5940C.
GPIB Communication
The IEEE 488 GPIB interface connector is located on the rear panel, directly above the power input module (See Figure 1.2 on page 3 or Figure 1.4 on page 4). Attach the GPIB cable to the 24-pin connector located on the rear panel. The connector is tapered to ensure proper orientation. Finger tighten the two screws on the cable connector.
A total of 15 devices can be connected together on the same GPIB interface bus. The cables have single male/female connectors on each end so that several cables can be stacked. This allows more than one cable to be attached to any one device. However, the maximum length of the GPIB cables must not exceed 20 meters (65 feet) total, or 2 meters (6.5 feet) per device. As good practice the number of GPIB cables connected to one instrument should be limited to less than 6.
USB Communication
The USB connector is located on the back rear panel, next to the GPIB connector. This USB connector is the square "B"-style connector. A standard USB A/B cable is required to communicate with the instrument. To communicate with the instrument using USB, please install the Virtual Com Port Driver found on the accompanying CD or website prior to connecting the unit to the PC. Please refer to Chapter 3 for more detailed instructions on operating the instrument through USB.
Tilt Foot Adjustment
The LDT-5910C and LDT-5940C have front legs that extend to make it easier to view the display. To use them, rotate the legs downward until they lock into position.
Rack Mounting
The LDT-5910C and LDT-5940C Thermoelectric Temperature Controllers may be rack mounted in a single or dual configuration by installing the appropriate rack mount flange on either side of the enclosure. All rack mount accessory kits contain detailed mounting instructions. Refer to the Options and Accessories table in Chapter 1 for applicable rack mount accessory part numbers.
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Connections
Temperature Control Output: A 15-pin DSUB connector (5910C) or 25-pin DSUB connector (5940C) is located on the back panel of the instrument. The connections for each case are shown below.
LDT-5910C LDT-5940C
PIN NUMBER CONNECTION PIN NUMBER CONNECTION
1 TE Module (+) 1 Sensor (+) Sense Terminal 2 TE Module (+) 2 Sensor (-) Sense Terminal 3 TE Module (-) 3 Fan (+) 4 TE Module (-) 4 N/C 5 TE Module Shield 5 N/C 6 Sensor Shield 6 Sensor / TE Module Shield 7 Sensor (+) 7 TE Module (+) Sense Terminal 8 Sensor (-) 8 TE Module (-) Sense Terminal
9 N/C 9 TE Module (+) 10 N/C 10 TE Module (+) 11 N/C 11 N/C 12 N/C 12 TE Module (-) 13 N/C 13 TE Module (-) 14 Fan (+) 14 Sensor (-) 15 Fan (-) 15 Sensor (+)
16 Fan (-) 17 Cable ID 1 18 Cable ID 2 19 N/C 20 N/C 21 TE Module (+) 22 TE Module (+) 23 N/C 24 TE Module (-) 25 TE Module (-)
The output terminals of the LDT-5910C or LDT-5940C should never be shorted together or loaded with less than 0.1 Ω. Doing so may result in damage to the instrument.
Analog Control Input: An isolated BNC connector is located on the rear panel of the LDT-5910C
and LDT-5940C provides the capability to adjust the temperature setpoint by applying a voltage signal. The LDT-5910C and LDT-5940C can accept a signal from -5 V to +5 V, with a gain of 2 °C/V and bandwidth of 5 Hz. This feature is useful in applications requiring sweeping of the temperature without using GPIB or USB remote interface.
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Interlocks: The LDT-5910C and LDT-5940C have normally open and normally closed interlock contacts. The interlock will change states from the “powered off” condition when the output is enabled and will change back when the output is disabled; including any error condition that disables the output.
External Fan Control:
The LDT-5910C and LDT-5940C feature the ability to control an
external fan through either the 15-pin DSUB connector (5910C) or the 25-pin DSUB connector (5940C). This circuit can provide up to 500 mA and may be controlled from 1 to 12 Vdc. The circuit will automatically increase the voltage to 12 Vdc start a fan from a stopped condition and will regulate to the desired voltage once more than 20 mA is drawn.
Pseudo 4-Wire Measurements: The LDT-5940C offers a pseudo 4-wire measurement feature
which helps to minimize errors induced by cable resistance both in thermistor/RTD sensor modes as well as on the output terminals. This feature is enabled by connecting the appropriate ‘sense’ terminals and is disabled by leaving them disconnected. This feature is not available in the LDT-5910C.
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Front Panel Operation
This section describes the fundamentals of operation for the LDT-5910C and LDT-5940C Thermoelectric Temperature Controllers. The order of descriptions will follow the normal progression of how the user would typically configure the instrument for use for the first time.
Figure 2.1 – Front Panel Display
Power On / Off
The POWER button applies power to the LDT-5910C or LDT-5940C and starts the power up sequence described above.
Adjust Knob and Enable Button
The ADJUST knob and ENABLE button is located on the upper right side of the LDT-5910C and LDT-5940C front panel. It is used to change the setpoints, enter parameter values, enter the GPIB address, enter Save or Recall bin numbers or enter instrument calibration data. The ENABLE button indicates the two modes of operation of the knob: Disabled (LED off) and Enabled (LED on).
Setup
SET Button – Allows the user to adjust settings under PARAM, RECALL and STORE. The SET button will allow the user to select each menu item and a second SET press will allow the user to adjust the parameter. When a parameter is being adjusted, the units will flash at a constant frequency. To return to the main menu, the sub menu will contain one option that reads “Return <SET>.”
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PARAM Button – Uses a menu system for temperature controller setup functions including Limits, Sensor, Sensor Calibration Constants, External Fan Control, Cable Resistance, Analog Input, GPIB Address, and Display Brightness. The SET button selects each menu item and a second SET press allows the user to adjust each parameter. The ADJUST knob can be used to cycle through and select or modify the following parameters:
Limits:
The Limits menu allows the user to select and modify the temperature, current,
and sensor upper and lower limits
Temperature High / Low Limits
Current Positive / Negative Limits
Sensor High / Low Limits
Depending on the sensor selected, the user can configure high and low limits for resistance, current or voltage.
Sensor
: The Sensor parameter allows the user to select the type of sensor for the
application: Thermistor, RTD, IC-V, or IC-I. For more information on temperature sensors see the “Sensor Options” later in this chapter.
Thermistor (100 µA, 10 µA, Auto Ranging, Linearized)
RTD (1 mA, 2.5 mA)
IC – Current
IC - Voltage
Sensor Calibration Constants: The calibration constants menu allows the user to enter sensor constants for thermistor, current and voltage IC, and RTD. For more information see the “Sensor Options” later in this chapter.
External Fan Control: Allows the user to enable or disable the external fan. The user can also set the voltage applied to an external fan.
Cable Resistance: To increase the accuracy of the TEC voltage measurement at higher currents the user can enter a cable resistance. The value entered for cable resistance should be equal to the round trip resistance between the temperature controller and the load. If the wiring is identical on both sides of the connection, as it is with ILX cables, this value is double the resistance value measured between the temperature controller and the load. The 4-wire capability of the LDT-5940C may be used instead if using a cable that supports this feature. Cable resistance should be set to 0.000 when using 4-wire capability.
Analog Control Input: Enables and disables the analog input feature, for optimal stability if a signal is not applied to the input the analog control input should be disabled.
GPIB Address: Adjust the GPIB address from 1 to 30 using the ADJUST knob.
Display Brightness: Adjust the display brightness from 1 to 10 using the ADJUST knob.
STORE Button – Stores instrument parameters for control mode, setpoint, limits, sensor type, calibration constants, and PID values for bins numbered 1 – 10.
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RECALL Button – Recalls instrument parameters for control mode, setpoint, limits, sensor type, calibration constants, and PID values for bins numbered 1 – 10. Recall bin 0 will reset all parameters to the factory defaults.
Non-volatile memory is used for saving the instrument parameters. When a store operation is performed, all of the current instrument parameters are stored to a "bin" number (1 - 10). When that "bin" number is recalled, the instrument configuration is recalled to the stored values.
To enter the STORE/RECALL mode, press either the STORE or RECALL button which will display the current “bin” number in the bottom of the screen. The current “bin” number will be flashing and the ADJUST knob can be used to select a new “bin”. The store or recall operation is performed when the SET button is pressed. If the SET button isn’t pressed after three seconds the LDT-5910C and LDT-5940C will time out and the new “bin” number will not be stored or recalled.
PID Control
SELECT Button – In PRESET mode, pressing SELECT displays the selected preset gain. In MANUAL mode, pressing SELECT displays the last PID values used and in AUTO-TUNE mode, pressing SELECT displays the auto-tuning method implemented. Pressing SELECT repeatedly or using the ADJUST knob cycles through the presets and PID values.
SET Button – In PRESET mode, pressing SET selects the preset gain range on the display. In MANUAL mode, pressing SET allows the user to adjust the value on the display. SET in the AUTO­TUNE mode starts the auto-tune procedure.
MODE Button –Cycles through PRESET, MANUAL and AUTO-TUNE modes. The selected mode is indicated by an illuminated LED. The output will not be disabled if the user changes the PID Control Mode.
Preset: The user can select one of the preprogrammed gain ranges by first selecting the PRESET LED using the MODE button then pressing the SELECT button or ADJUST knob to display the correct preset gain for the thermal load and pressing the SET button to select the gain. The LDT-5910C and LDT-5940C implements the original gain ranges of the LDT­5910B (Gain 1, 3, 10, 30, 100, and 300). Presets have also been implemented for specific ILX Lightwave mounts. When a preset has been selected for a mount, the LDT-5910C and LDT-5940C will set the PID values, sensor type, and current limits. The following mounts are compatible with the LDT-5910C and LDT-5940C: LDM-4405, LDM-4407, LDM-4409, LDM­4412, LDM-4980, and LDM-4990.
Manual: In MANUAL mode the user can adjust the PID values or select one of the preset PID values to load into the manual adjust (note: if the user adjusts the preset PID value loaded into manual PID adjust the change will not permanently affect the preset PID value). To manually adjust the PID values first select the MANUAL LED by pressing MODE, then press SELECT to change between P, I, and D. To adjust the PID value, press SET; to move to the next value press SELECT.
To load a preset PID value use the SELECT button to cycle to the “Adjust Preset” screen, and then press the SET button, then using the SELECT or ADJUST knob display the preset PID that you want to load. Once the correct preset is displayed press the SET button to load the values.
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Auto-tune – The auto-tune mode will calculate a thermal system's PID coefficients through an iterative PID temperature control process. To enter the auto-tune mode first press MODE until the AUTO LED is illuminated, and then SET to begin the auto-tune procedure. When the LDT-5910C and LDT-5940C successfully completes the auto-tune the instrument will revert back to MANUAL and the calculated PID values will overwrite the current PID values in MANUAL mode. If the auto-tune process fails an error will be displayed on the screen. For more information on the auto-tune process see Appendix B. Additional auto-tune methods may be available in the future via a firmware upgrade, for more information contact sales at 800-459-9459 / sales@ilxlightwave.com.
There are limitations to the auto-tune feature. Any of the following will cause the auto-tune algorithm to fail:
Thermal systems requiring the proportional term to be less than 0.5  Noisy temperature measurements  Reaching any output off enable condition (such as temperature or voltage limits) during
the auto-tune operation.
If the auto-tune algorithm fails for a particular thermal system, it may be necessary to modify the PID coefficients manually.
Mode
SELECT Button – Selects constant temperature, constant sensor and constant current mode. The selected mode is indicated by an illuminated LED. The output is disabled when the control mode is changed.
ON Button – Enables and disables the output. An enabled output is indicated by an illumined LED. A disabled output is indicated by a dark LED.
TEMP – Controls the LDT-5910C or LDT-5940C to a constant temperature
I TE – Sets the LDT-5910C or LDT-5940C to output a constant current
R SNSR – Controls the LDT-5910C or LDT-5940C to a constant sensor value
HEAT – Illuminated when negative current is flowing
COOL– Illuminated when positive current is flowing
I LIMIT – Illuminated if the LDT-5910C or LDT-5940C has reached the user defined
current limit.
Display
The large 7-segment LED displays the measured value in the selected operating mode. When the setpoint is being adjusted, the 7-segment LED display will show “set” after the dimension and revert back to reporting the measured value after the three second timeout. The dot matrix display, at the bottom of the screen, cycles through available measurement and mode setpoint. The available measurement and setpoint parameters are listed under General Operation Procedures.
The measured values are indicated by an equal sign, as in Figure 2.2 a, and the setpoint values are indicated by a colon sign, as in Figure 2.2 b.
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Figure 2.2 a – The measured current Figure 2.2 b – The setpoint current
LEFT Button – Cycles through available measurement and setpoint parameters that can be
displayed in the left hand side of the display.
RIGHT Button – Cycles through available measurement and setpoint parameters that can be displayed in the right hand side of the display.
ADJUST LED – Indicates the status of the ADJUST knob: an illuminated LED means that the knob is enabled and a dark LED means that the knob is disabled.
Error Indicators
The LDT-5910C and LDT-5940C indicate operational errors on the measurement display with an error code. A complete list of error codes can be found in Chapter 5.
General Operating Procedures
The discussion below presents guidelines for operation as well as some common operating procedures. Remote operations are discussed in the next chapter.
The output terminals of the LDT-5910C or LDT-5940C should never be shorted together or loaded with less than 0.1 Ω. Doing so may result in damage to the instrument.
Warm-Up and Environmental Considerations
To achieve the rated accuracy, allow the LDT-5910C or LDT-5940C to warm-up for at least one hour before use. Operate the controller within the environmental limits specified in Chapter 1. The best accuracy is achieved near the calibration temperatures.
General Guidelines for Sensor Selection and Safety Limits
This section presents some guidelines to assist in selecting the optimal settings for your application.
Sensor Options
The LDT-5910C and LDT-5940C Thermoelectric Temperature Controllers can measure temperature through a variety of sensor options; thermistors, IC sensors (IC-I, IC-V) or RTDs.
THERMISTOR – When a thermistor sensor is selected, the LDT-5910C and LDT-5940C measures temperature based on a negative temperature coefficient (NTC) thermistor. An NTC thermistor is a device whose resistance decreases as its temperature increases. The controller provides a sense current (100 µA or 10 µA) through the thermistor which results in a voltage across the thermistor. This voltage is used as a feedback signal by the LDT-5910C and LDT­5940C digital control loops to maintain a constant temperature. The thermistor should be connected across the Sensor+ and Sensor- pins (pins 7 and 8).
March 2019 17 LDT-5910C and LDT-5940C
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