December 2019 94 LDC-3706 Series Laser Controller
TEMPERATURE CONTROLLER
The instrument reads “Sensor Open”
Confirm the appropriate sensor has been selected under the
PARAM menu.
Check the cable connections to the sensor.
If the problem persists, contact customer support at ILX
Lightwave.
Power on, but temperature is not
controlled or is unstable.
If there is a SENSOR OPEN indication (Error code 505),
check the sensor connections (pins 14,15). Check that the
proper sensor current range is selected.
Check that the appropriate coefficients have been set for the
sensor. Refer to the Sensor Options section under General
Operating Procedures in Chapter 2.
Check that the P, I and D constants are optimized for the
thermal load and that the current limit value is not too low.
If the problem persists, contact customer support at ILX
Lightwave.
IC-Current sensor value is not changing
on the LDC-3706.
Insure the 4-wire sensor voltage measurement (pins 1 and
2) are not connected to the sensor.
Inaccurate sensor, TEC voltage, or TEC
current measurement on the LDC-3706.
Insure the 4-wire TEC sensor connections (pins 7 and 8) are
connected. For thermistor or RTD sensors insure the 4-wire
sensor connections (pins 1 and 2) are connected.
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