Lucent Technologies Lineage
®
2000 25A Ferroresonant Rectifier J85502A-1
Issue 4 May 1998
Troubleshooting and Adjustments 7 - 9
Figure 6-3 shows test points and components on the CM2
control board. Other “E” test points are always positive with
respect to either E14 or E15 for all voltage measurements. The
plant control cable connector J2A MUST be connected to P2A
on CM2 for this procedure.
1. Connect a DMM across the rectifier shunt and a test load
across the output of the rectifier. (See Figure 6-1 and
Section 6, “Test Load Connection.”) The rectifier must be
delivering approximately 12.5A, 50 percent of its rated
output current.
2. At the CM2 control board, use the DMM to measure the
voltage between test points E7 and E15. (E7 is more
positive.) The voltage should be:
2 volts + 160
×
(millivolts of shunt voltage*)
*The tolerance is - 0 lower and + 0.7% higher.
If so, this procedure is completed. If not, continue with
Step 3.
3. Reduce the load current to zero by opening the test load.
Using the DMM, measure the voltage between test points
E5 and E14. (E5 is more positive.) This voltage must be
less than 0.5 volt.
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 2.
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 27.5A, 10 percent above the rectifier's
current rating.
1. Remove the rectifier from service as specified in Steps 1
through 5 of “Removing a Rectifier from Service” in this
section. Connect the test load following Steps 3 through 9
of Section 6, “Test Load Connection.”
