Replacing A Rectifier - Nortel AccessNode 2016 User Manual

Procedure 5-3

Replacing a rectifier

Use this procedure to replace rectifiers.
Action
Step
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Action
Notify the Alarm Center of incoming alarms during this procedure.
Turn off the ac and dc circuit breakers on the rectifier being replaced. Open
the associated sense switch on SW1 on the back plane.
Release the rectifier retaining bar by loosening the screws.
Slide the rectifier out of the shelf carefully. Reuse the shipping carton of the
new rectifier to store or ship the removed unit.
Ensure that the ac and dc circuit breakers on the new rectifier about to be
plugged-in are in the OFF position (down). Slide the unit firmly into the shelf,
resting it on top of the stored blank panel.
Replace the retaining bar and secure she screws.
Operate the ac circuit breaker of the rectifier to the ON position.
With the dc breaker in the OFF position, adjust the float and equalize voltage
levels to the same level (approx.) as that of the other rectifiers.
Operate the dc circuit breaker to the ON position and close the associated
sense switch (SW1 on the backplane).
Set the SLS/FS switch to the same position as that of the other rectifiers.
Verify that the replacement rectifier is sharing the load by observing its
ammeter. It should display approximately the same value as the ammeter on
the other rectifiers. If not, adjust its float and equalize voltage levels.
Notify the Alarm Center when you complete this procedure.
Note: For detailed information regarding MPR25 rectifiers, refer to
Description, Installation, Operation and Maintenance Manual 169-2071-500.
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User Guide Rel 1.0 Standard May 1999
Maintenance 5-5