Troubleshooting - ILX Lightwave LDT-5900 Series User Manual

5
C H A P T E R

Troubleshooting

This section is a guide to troubleshooting the LDT-5900 Series Temperature
Controllers. Some of the more common symptoms are listed here, and the
appropriate troubleshooting actions are given. If problems persist, contact ILX
Customer Service (see page xii for contact information). Also check the
www.ilxlightwave.com Support page, and the Library page for Application Notes
and Technical Notes.
Table 5.1 Problem and Action
SYMPTOM
General
TE Controller
128
LDT-5980/ 5948
C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
Troubleshoot ing
Unit will not power up.
Power on, but outputs have been shut off.
Instrument is locked up or instrument
resets itself.
Output has been shutoff.
Power on, but no TE current output.
Power on, but temperature is not
controlled or is unstable.
Unable to adjust output or parameter.
CORRECTIVE ACTIONS
Check AC Power line voltage and power cord
connection.
This may occur if the instrument loses power (AC
line) briefly or line voltage drops below specification.
If instrument is locked up, power it off and then on to
restart.
Check for output off enable conditions (Chapter 3);
make sure the cable is securely connected to the unit
and the load.
Check the load connections and operating mode.
Make sure the cable between the instrument and the
load is secure.
If there is a SENSOR OPEN indication (E412), check
the sensor connections (pins 14,15).
Check that the proper sensor current range is
selected. The 10 A setting is required if the
thermistor resistance is more than 50 k . See
Application note #2 at www.ilxlightwave.com or
contact ILX Customer Service. The 1 mA setting is
required for resistances less than 1 k .
Check that the appropriate coefficients have been set
for your sensor. Refer to "Sensor Options" in Chapter
2.
Check that the P, I and D constants are optimized for
your thermal load and that the current limit value is
not too low. Refer to "PID / Auto-Tune" in Chapter 2.
See Technical Solutions on the Support page at
www.ilxlightwave.com.
Ensure that the desired parameter is highlighted.
Ensure that you are not trying to set a setpoint to a
higher value than the limits.
Verify lock indicator is not on.
Press Enter button after adjusting parameter.