Lucent Technologies Lineage
®
2000 25A Ferroresonant Rectifier J85502A-1
Issue 4 May 1998
Troubleshooting and Adjustments 7 - 5
Adjustments
This section includes procedures to check fuses (Clear RFA),
calibrate the digital meter, adjust the isolated current measuring
circuit, and adjust the current limit.
Clear Rectifier
Failure Alarm
(RFA)
Refer to Figure 2-1.
1. Observe and record the status of the fuses in the plant
controller.
2. Turn the rectifier POWER switch Off.
3. If any fuses are blown, replace them with one of the same
type and capacity. Check +V and -V fuses located on the
control panel.
4. Turn the rectifier POWER switch On.
5. If the rectifier started, minor alarm on controller cleared,
and the rectifier RFA LED extinguished, then the RFA
problem has been cleared. Otherwise, continue with the
following procedures.
6. Observe and record the rectifier output voltage.
7. If the rectifier output voltage is greater than the plant
float voltage, then use the following procedure:
a.
Turn the OUTPUT VOLTS ADJ potentiometer
counterclockwise to lower the output voltage to the
correct value.
b.
If the rectifier OUTPUT VOLTS ADJ potentiometer
can adjust the voltage to the correct level, then the
RFA problem has been cleared. Otherwise, continue
this procedure.
8. If the rectifier output voltage is less than the plant voltage
and/or all rectifiers shut down, then use the following
procedure.
a.
If the CM2 control board has not been replaced, then
replace it at this time (see Section 8).
b.
If the rectifier started, minor alarm on the controller
cleared, and the rectifier RFA LED went out, then the
