Lucent Technologies Lineage
®
2000 25A Ferroresonant Rectifier J85502A-1
Issue 4 May 1998
Troubleshooting and Adjustments 7 - 3
Table 7-A: Troubleshooting
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
T2. See SD-82604-01.
3. Check for +27 Vdc (±5 V) across C1
on CM2. If not present, but ac is present
on all secondaries of T2, check the
connection CM1. If the connection is
okay, replace the CM2 board (see
Section 8)
4. Check wiring associated with coil of
K1 or K3, and contacts 4-7 of K2.
2. Rectifier attempts to
start, but K1 contactor
does not operate, (make
“clunk” sound) and
RFA lights.
1. Fuses +V and/or
-V blown.
2. CM2 board is
defective.
1. Check fuses (see 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 3.
3. Rectifier goes to high
voltage at turn-on.
1. Output Volts
Adj potentiometer
is set too high.
2. CM2 board is
defective.
3. Open thyristor.
1. Turn potentiometer counterclockwise.
2. Replace CM2 (see Section 8).
3. Replace thyristor (see Section 8).
4. Control panel digital
meter does not light.
1. Defective
wiring to CM3
digital meter board.
2. CM3 board is
defective.
3. CM2 board is
defective.
1. Check wiring to CM3 board. Check
connectors J1B on CM3 and J3A on
CM2 for proper insertion.
2. Replace CM3 (see Section 8) and then
calibrate (see Section 7).
3. Replace CM2 (see Section 8).
5. POWER LED is
On; ac is good; rectifier
output voltage is zero.
1. Open ac
contactor coil or
contactor not
making contact.
2. Primary
winding of ferro
transformer is
open.
1. Turn Off power at ac service panel
and measure contactor coil resistance. If
it is open, replace contactor/coil.
2. Check if cables from bottom of TB1
are connected properly. If so, replace T1
(see Section 8).
6. Rectifier output
voltage is low, not
adjustable, and power
is On.
1. Defective CM2.
2. Shorted
thyristor.
1. Replace CM2 (see Section 8). Verify
that output voltage is adjustable. If not,
replace thyristor (see Section 8).
