Lightwave Communications LDT-5525 manual Troubleshooting, Symptom Causes and Corrective Actions

MAINTENANCE AND TR OUBLESHOOTING

Troubleshooting

Troubleshooting

C H A P T E R 3

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	Check AC power line voltage and power cord connection
power up
Power on, but display is frozen,	This may occur if the unit loses power (AC line) briefly. Turn the
switches don’t work	power switch off and on again to restart
Power on, but no TE current	If TE OPEN indicator is lit, check the load connections and then
output	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	Check that pins 14 and 15 of the output connector are not
current is always about 0.0 A	connected (see Chapter 2: Booster Operation)
Power on, but temperature is	If SENSOR OPEN indicator is lit, check the sensor connections
not controlled	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

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