C H A P T E R 3

MAINTENANC E AND TR OUBLESHOOTING

Troubleshooting

 

Unable to adjust output or

Check the ADJUST ENBL switch; the indicator must be lit for any

 

 

parameter

adjustments to be made

 

 

 

Check the MODE or DISPLAY switch; if they do not respond, the

 

 

 

unit may be in measurement calibration mode (see Chapter 3);

 

 

 

press the OUTPUT switch to abort this mode.

 

 

Unable to switch DISPLAY,

The unit may be in measurement calibration mode (see Chapter

 

 

MODE, SENSOR CAL or

3); press the OUTPUT switch to abort this mode

 

 

PARAMETER modes

 

 

 

 

 

 

 

Output goes off intermittently

Check that the AC power cord connection is secure; power line

 

 

 

drop outs may reset the unit and when the power is restored, the

 

 

 

output will be off

 

 

 

Check the TE module connections; a high impendance on the TE

 

 

 

load may cause the output to exceed the compliance voltage

 

 

 

momentarily, thus shutting the output off

 

 

R Mode set point is not saved

The R mode set point value is not independent from the T mode

 

 

 

set point value; if the control mode is changed from R mode to T

 

 

 

mode, the R set value will change to a value which corresponds to

 

 

 

the temperature, based on C1 and C2

 

 

 

 

 

26LDT-5525

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Image 40
Lightwave Communications LDT-5525 manual Temperature, based on C1 and C2