Lucent Technologies Lineage
®
2000 125A Ferroresonant Rectifier J85502C-1
Issue 8 July 1999
Troubleshooting and Adjustments 7 - 11
4. Connect the DMM between test points E7 and E15 and
adjust potentiometer R35 until the DMM indicates the
voltage that was calculated in Step 1.
5. Recheck the results by performing the procedure again
from Step 1.
Adjust Internal
Selective HVSD
(Battery Plant
Without
Controller)
This procedure is only for rectifiers in battery plants without a
plant controller. Perform the procedure with the rectifier
disconnected from the battery to avoid overvoltage conditions
on the actual battery plant loads. A portable test load is required
that can supply at least 138A, 10 percent above the rectifier’s
current rating.
1. Remove the rectifier from service per “Removing a
Rectifier from Service” in this section. Connect the test
load between the + and – buses marked on the rectifier.
Then complete the steps listed.
2. Turn the rectifier POWER switch Off.
3. Turn the DC OUTPUT circuit breaker Off (down).
4. Adjust the test load to 138A, 10 percent, or more, above
the rectifier’s current rating. Read the load current on the
OUTPUT meter.
5. Adjust the OUTPUT VOLTS ADJ potentiometer to
obtain a rectifier voltage of 27.5 ± 0.2 volt (24-volt
rectifier) or 55.0 ± 0.2 volt (48-volt rectifier). Hold the
meter selector switch in the RECT V position and read the
voltage on the meter.
6. Using a jeweler’s screwdriver, rotate potentiometer R23
on CM2 (205A1) control board until the rectifier shuts
down.
7. Set the rectifier controls according to Step 1 in “Restoring
a Rectifier to Service” in Section 7. Disconnect the test
load and complete the steps listed in the section.
Adjust Current
Limit
Off Line Adjustment: Use “Current Limit Test (Off Line)” in
Section 6 to verify that the current limit circuit needs adjustment,
before continuing with this procedure.
