Lucent Technologies Lineage
®
2000 200A Ferroresonant Rectifier J85503B-2
Issue 8 January 1999
Troubleshooting and Adjustments 7 - 13
b. If the rectifier Float Adj potentiometer can be used to
adjust the voltage to the correct level, the RFA problem
has been cleared. Otherwise, continue with the
following procedures.
3. If the rectifier output voltage is less than the plant voltage
and/or all rectifiers shut down, then use the following
procedures.
a. If the CM2 board has not been replaced, then replace it
at this time.
b. If the rectifier started, minor alarm retired on controller,
and the rectifier RFA light extinguished, then the RFA
problem has been cleared. Otherwise, continue with the
following procedures.
4. If replacing the CM2 board does not clear the problem,
then the outputs from T1 and T2 are probably unbalanced.
Try the following:
a. Check the wiring to the thyristors (see Figure 8-1).
b. Check for defective thyristors. If defective, replace.
5. Verify that the controller's high voltage shutdown circuit is
operating properly (see the controller manual).
Clear Fuse
Alarm (FA)
1. If the circuit breaker (CB1) is tripped, restore the rectifier
to service.
2. If CB1 did not trip, check alarm fuses F1, F2, and F3 on
CM1. These fuses are accessible by opening the door of
the rectifier. CM1 is near the output filter capacitors.
3. If the F2 or F3 alarm fuse is blown, check for possible
trouble and replace the fuse.
4. If the F1, F2, F3, F4, or F5 capacitor fuse or F1 alarm fuse
on CM1 is blown, check for a shorted output capacitor.
Remove the rectifier from service to replace any shorted
capacitor and/or blown fuse.
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