Lucent Technologies Lineage
®
2000 50A Ferroresonant Rectifier J85502B-1
Issue 6 May 1999
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 per 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 per 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 per Section 8.
3. Replace thyristor per 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 per Section 8. and then
calibrate per Section 7.
3. Replace CM2 per 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 per
Section 8.
6. Rectifier output
voltage is low, not
adjustable, and
power is On.
1. Defective CM2.
2. Shorted
thyristor.
1. Replace CM2 per Section 8. Verify that
output voltage is adjustable. If not, replace
thyristor per Section 8.
