Lucent Technologies Lineage
®
2000 25A Ferroresonant Rectifier J85502A-1
Issue 4 May 1998
Testing 6 - 17
The output current should indicate 25-25.25A, 100 to 101
percent of the rated output current.
3. If the output current is not within 25-25.25A, the current
limit needs adjustment. See “Adjust Current Limit” in
Section 7.
Isolated Current
Measuring (VI)
Test (MCS or
Galaxy
Controller)
This procedure checks the isolated current measuring circuit
(voltage proportional to current adjustment) on the rectifier’s
CM2 control board. The procedure is required only when CM2
is installed as part of a Lineage
®
2000 Battery Plant with an
MCS (Microprocessor Controlled System) or Galaxy controller,
or when the output current reading on the rectifier does not agree
to within 2.5 percent of the MCS or Galaxy controller reading.
This procedure must be performed while connected to an MCS
or Galaxy controller and a battery.
Refer to Figure 6-3 for components on the CM2 control board.
Plant control cable connector J2A MUST be connected to P2A
on CM2 for this procedure.
1. Connect a DMM between E1 and E2 on CM1 (see Figure
6-2).
2. Increase the load so the rectifier delivers approximately
12.5A, 50 percent of its rated current capacity.
3. Observe the DMM and record the rectifier's shunt voltage.
The shunt is rated 31.25A/50mV = 0.625A/mV, which
means that each millivolt of voltage drop across the shunt
indicates 0.625A of output current.
4. Convert the DMM’s shunt voltage reading to amperes. For
example, if the DMM reads 40mV, then
40mV x 0.625A/ mV = 25A of output current. As this
calculation indicates, the rectifier is operating at full load,
and the rectifier shunt voltage is 40mV at full load.
5. Compare the amperes calculated in Step 4 with the rectifier
drain indication on the MCS or Galaxy controller.
Note
At the rated output current of the rectifier, the shunt voltage is
40 millivolts.
