Lucent Technologies Lineage
®
2000 200A Ferroresonant Rectifier J85503B-2
7 - 4 Troubleshooting and Adjustments
Issue 8 January 1999
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 (28)
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.
5. Rectifier gives Phase Alarm.
1. One of the phase voltages is
too low under a load condition.
1. Check connections and
voltage at contactor.
2. One of the phase voltages
coming into CM2 is too low.
2. Verify that the voltages
across C9, C10, and C11 are
equal to ± 2 volts.
3. CM2 is defective.
3. Replace CM2.
6. Rectifier goes into high
voltage at turn-on.
1. Float Adj potentiometer is
set too high.
1. Turn Float Adj
potentiometer all the way
counterclockwise. Hold meter
selector switch in Rect V
position and turn potentiometer
clockwise until the rectifier
shuts down. Note at what
voltage this occurs.
2. Internal selective high
voltage shutdown (ISHVSD)
may be set too low.
2. Verify ISHVSD is set to 58
volts.
3. CM2 is defective.
3. If the rectifier did not shut
sown at the BUHVSD setting,
replace CM2.
4. If the rectifier did shut down
within the limits specified,
rotate the potentiometer one full
turn counterclockwise. Turn
the rectifier Power switch Off
then back On. (Rectifier
restarts.)
7. Rectifier gives RFA alarm at
certain loads.
1. CM2 is defective.
1. Replace CM2. Verify that the
rectifier is on and delivering at
least 2 1/2% of its rated output
current (if not connected to
batteries). See Problem 5.
2. Defect in control and alarm
leads from fuses to CM2.
2. Check alarm leads.
3. Check for +27Vdc (±5V)
across C4 on CM2.
Table 7-A: Troubleshooting
Problem
Probable Cause
Probable Corrective Action
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