Lucent Technologies Lineage
®
2000 100A Ferroresonant Rectifier J85503A-1
Issue 6 October 1998
Troubleshooting and Adjustments 7 - 3
Table 7-A: Troubleshooting (Sheet 1 of 3)
Problem
Probable Cause
Probable Corrective
Action
1. Rectifier will not start.
(J2A should be
disconnected. If not, the
controller could be
shutting the rectifier
down.)
1. No ac input to rectifier.
2. CM2 board is defective
1. Check for ac input
voltage to rectifier.
2. Check for ac voltage on
secondary of T3. See SD.
3. Check for +27 Vdc
(±5V) across C4 on CM2.
If not present, but ac is
present on all secondaries
of T3, check the
connection P1/J1 on
CM1. If the connection is
okay, replace the CM2
board as described in
“Replace CM2 Control
Board” in Section 8.
4. Check wiring associated
with coil of K1, and
contacts 4-7 of K2.
2. Rectifier starts or
attempts to start but RFA
lights.
1. Fuses F1- F3, FA1-FA3,
and/or +V, –V blown.
2. CM2 board is defective.
1. Check fuses as
described in “Clear
Rectifier Failure Alarm
(RFA)” in Section 7.
2. Measure output voltage
while rectifier is powering
up. If the output voltage
exceeds 29 or 58 volts, the
rectifier is shutting down
due to high output voltage.
See Probable Causes
associated with Problem 4.
3. Rectifier PHA lights.
1. One of the phase
voltages is too low under a
load condition.
2. One of the phase
voltages coming into the
CM2 board is too low.
3. CM2 board is defective.
1. Check connections and
voltage at contactor.
2. Verify that the voltages
across C9, C10, and C11
on CM2 are equal ±2V.
3. Replace CM2 board as
described under “Replace
CM2 Control Board” in
Section 8.
