Lucent Technologies Lineage
®
2000 25A Ferroresonant Rectifier J85502A-1
7 - 8 Troubleshooting and Adjustments
Issue 4 May 1998
12. If the rectifier meter does NOT meet the tolerances,
replace the CM3 meter board (see Section 8). Repeat this
procedure from Step 1.
13. If the rectifier can be calibrated and the CM3 board is a
Series 1 or 2 board, reposition the board over the support
standoffs. Verify that the latches and switch bezel clips
snap to lock the board in place.
14. Close the door of the rectifier and secure it with the
locking screws.
Adjust Isolated
Current
Measuring
Circuit (VI)
This procedure adjusts the isolated current measuring circuit
(voltage proportional to current adjustment) on the rectifier's
CM2 control board (205A1). Use the test in Section 6, “Isolated
Current Measuring (VI) Test (MCS or Galaxy Controller),” to
verify that the circuit needs adjustment before following this
procedure. The procedure must be performed in a working plant
with the rectifier connected to an MCS or Galaxy controller and
to a battery.
Table 7-B: Digital Meter Tolerance
Meter Position
Tolerance
RECT V
±0.5 volt for Series 1 or 2 CM3
boards
±0.02 volt for Series 3 CM3 boards
AMPS
±2.5 percent of rectifier rating*
Notes:
To compare, measure the shunt voltage. 1mV of shunt voltage
indicates 0.625A of output current. Example: The shunt
voltage should be 40 mV at full load, 25A. at 125 percent of
full load, the shunt voltage should be 50 mV. See “Backup
High Voltage Shutdown Test (On Line)” in Section 6.
To verify CM3 digital meter’s accuracy, measure the shunt
voltage between E1 and E2 on CM1. 1mV of shunt voltage is
equivalent to 0.625 ampere of output current; i.e., at 12.5
ampere or 25 ampere load, the shunt voltage should read
20mV or 40mV respectively (20 x 0.625 = 12.5; 40 x 0.625 =
25). If CM3 does not display the current within ±2.5% of the
actual measured and calculated current, adjust R15 on CM3.
