User manual

Maintenance 59
Emerson Energy Systems MFA150 Power System  NT6C28C User Manual
Replacing a rectifier
Replace a rectifier as described in Procedure 5.
Procedure 5 – Replacing a rectifier
Step Action
1 Notify the alarm centre of the possibility of incoming alarms during the
execution of this procedure.
2 Ensure that the AC and DC circuit breakers on the rectifier being
replaced are in the OFF position.
3 For a system equipped with an analog controller card, open the sense
switch on the SENSE DIP switch module on the control and
distribution panel associated with the rectifier being replaced.
For a system equipped with an RPM1000C, disconnect the
corresponding rectifier connector on the RPM1000C.
4 Using a flat blade screwdriver loosen the captive screw(s) on the
rectifier retaining bar and swing the bar down.
5 Slide the rectifier out of the shelf carefully. Pack the rectifier in the
shipping carton of the new rectifier.
6 Ensure that the AC and DC circuit breakers on the front panel of the
new rectifier are in the OFF position.
7 Carefully slide the new rectifier into position, making sure that it is fully
inserted. For a Helios Rectifier 50/48, the RFA lamp should light up.
8 Rotate the rectifier retaining bar up and tighten the captive screw(s) to
secure the rectifier into position.
9 With the DC breaker in the “OFF” position, adjust the float and
equalize voltage levels to the same level ( approximately ) as that of
the other rectifiers.
10 For rectifiers equipped with the SLS/FS feature, ensure that the
SLS/FS switch is set to the same position as that of the other
rectifiers.
11 For a system equipped with an analog controller card, close the sense
switch associated with the new rectifier on the SENSE DIP switch
module on the control and distribution panel.
For a system equipped with an RPM1000C, reconnect the
corresponding rectifier connector on the RPM1000C.
12 Put the DC circuit breaker in the “ON” position.
13 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 as described in the appropriate user manual (see
Appendix D).
14 Notify the alarm center at the end of the procedure.
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