User's Manual

MAINTENANCE AND TROUBLESHOOTING
Troubleshooting
06_07 LDT-5525 25
CHAPTER 3
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Troubleshooting
This section is a guide to troubleshooting the LDT-5525 Temperature Controller.
Some of the more common symptoms are listed here, and the appropriate
troubleshooting actions are given. We recommend that the user start at the
beginning of this guide. Read the symptom descriptions, and follow the steps for
the corrective actions which apply. If you encounter problems which are beyond
the scope of this guide, contact your ILX Lightwave representative.
Symptom Causes and Corrective Actions
LDT-5525 Series unit will not
power up
Check AC power line voltage and power cord connection
Power on, but display is frozen,
switches don’t work
This may occur if the unit loses power (AC line) briefly. Turn the
power switch off and on again to restart
Power on, but no TE current
output
If TE OPEN indicator is lit, check the load connections and then
try again
Check that pins 14 and 15 of the output connector are not
connected (see Chapter 2: Booster Operation)
Power on, but measured ITE
current is always about 0.0 A
Check that pins 14 and 15 of the output connector are not
connected (see Chapter 2: Booster Operation)
Power on, but temperature is
not controlled
If SENSOR OPEN indicator is lit, check the sensor connections
and then try again
Check that the back panel SENSOR SWITCH position is set to the
proper sensor type
Check that C1 and C2 are correct values for your sensor
Check that the GAIN setting is not too low and that the I LIMIT
value is not too low for your thermal load