Lucent Technologies Lineage
®
2000 400A, 60Hz Ferroresonant Rectifier J85503C-3
Issue 10 July 2000
Troubleshooting and Adjustments 7 - 3
Diagnostics
Table 7-A lists possible problems, causes, and solutions that may occur
with the rectifier subsystems. Refer to schematic drawing SD-83102-03
shipped with the J85503C-3 rectifier.
Table 7-A: Troubleshooting
Problem
Probable Cause
Probable Corrective Action
1. Rectifier will not start and
no indication on front panel.
(J5A should be disconnected.
If not, the controller could be
shutting the rectifier down.)
1. No ac input to rectifier.
1. Check for ac input voltage to
rectifier.
2. Board improperly
installed.
2. Check board interlocks and
connections to boards.
2. Rectifier will not start and
gives RFA alarm.
1. CM2 control board is
defective.
1. Check for +27 Vdc between
E13(+) and E14(-) on CM2. Check
for +12 Vdc between E1 and E14
and -12 Vdc between E3 and E14. If
not present, replace the CM2
2. CM7 transformer
board is defective
2. Check wiring associated with coil
of K1 and contacts 4-8 of K3 on
CM7. If bad, replace CM7.
3. Board improperly
installed or defective
ribbon cable.
3. Check board interlocks,
connections to boards, and ribbon
cables.
4. CM3 meter board is
defective.
4. Replace CM3.
5. CM4 interface board is
defective
5. Replace CM4.
6. Output power fuse has
opened or fuse alarm
switch is defective.
Check output power fuse and
switch. Replace fuse if open or
switch if defective.
3. Rectifier starts but give FA
and RFA alarm.
1. Fuses blown.
1. Check alarm fuses on CM1.
Check filter capacitor fuses.
4. Rectifier starts but gives
RFA alarm.
1. CM2 is defective.
1. Measure output voltage while
rectifier is “walking in.” If the
output voltage exceeds 58 volts, the
rectifier is shutting down due to high
output voltage. See Probable Causes
for Problem 9.
2. Replace CM2.
2. CM3 is defective.
3. Replace CM3.