Lucent Technologies Lineage
®
2000 400A, 60Hz Ferroresonant Rectifier J85503C-3
Issue 10 July 2000
Spare Parts and Replacement Procedures 8 - 19
Disconnecting
a Rectifier
DANGER: AC voltages up to 600 volts to ground, and dc voltages
of -48 volts with high current capacities, may be present in the
equipment. Follow the procedures in the order given to minimize
dangerous encounters with these voltages. Exercise extreme caution
when working near the battery bus bars.
Follow all safety precautions in Section 4.
1. At the rectifier control panel, turn the Power switch Off. Turn the
CB1 circuit breaker off (down).
2. At the ac service panel, remove the fuses or open the circuit
breakers which supply the rectifier with ac power. Tag fuse
holders or circuit breaker to instruct all to leave circuit
deenergized.
3. Remove regulation fuses associated with the rectifier remote sense
leads (usually located in the plant controller).
4. When a Lucent Technologies controller is used, disconnect the
plant cable assembly from the rectifier CM4 interface board at
connector P5A. The cable assembly must be removed from the
cable tie anchors to permit its withdrawal through the conductor
opening in the cabinet. The cable tie anchors, while providing a
secure physical support of the cable assembly, protect the cable
assembly from undesirable abrasion and bending.
Note: When a Lucent Technologies controller is not used,
disconnect the remote bay cable assembly from the rectifier at
terminal strips TB1 and TB2 of interface board CM4.
5. The rectifier's output filter capacitor must be completely
discharged. Verify by connecting a DMM directly to the capacitor
bus bars inside the rectifier. It will take a few minutes to
completely discharge the capacitors, after the CB1 circuit breaker
is turned off in Step 1.
6. One at a time, disconnect the battery plant end of the dc output and
output return conductors from the battery plant charge and charge
ground bus bars. Insulate the connector ends and label the
conductors for easy identification when reconnecting.
7. One at a time, disconnect the dc output conductors from the
rectifier “hot” and return bus bars. Insulate the connector ends and
label the conductors for easy identification when reconnecting.