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Maintenance 45
5.3.2 Replacing a Rectifier
Replace a rectifier as described below for a Helios Rectifier 100/48 or as in
Replacing a Helios
Rectifier 200I/48 or 200E/48,
whichever is applicable.
Replacing a Helios Rectifier 100/48
1. Notify the alarm center of incoming alarms during this procedure.
2. Turn OFF the AC and DC circuit breakers on the rectifier.
3. Remove the corresponding sense fuse on the front of the controller.
4. Remove the left and right rectifier retaining bars by loosening the screws.
5. Slide the rectifier out of the shelf carefully. Reuse the shipping carton of the new rectifier to
store or ship the removed unit.
6. Ensure that the AC and DC circuit breakers on the new rectifier about to be plugged-in are in
the “OFF” position (down).
7. Carefully slide the new rectifier into the shelf, ensuring that it is fully inserted.
8. Reinstall the left and right side clamping brackets removed in
Step 4
to secure the rectifier
into position.
9. Operate the AC circuit breaker of the new rectifier to the “ON” position.
10. With the DC breaker in the “OFF” position, adjust the float, equalize and high voltage
shutdown voltage levels as required. Refer to the appropriate rectifier user manual (see
6.0 -
Reference Documents).
11. Reinstall the sense fuse (RC) removed in
Step 3.
12. Ensure that the FLS/FS switch on the rectifier is set to the same position as that of the other
rectifiers in the power system.
13. Operate the DC circuit breaker of the new rectifier to the “ON” position.
14. Verify that the replacement rectifier is sharing the load by observing its ammeter. It should
display approximately the same value as the ammeters on the other rectifiers. If not, adjust
its Float and Equalize voltage levels as described in the appropriate rectifier user manual (see
6.0 - Reference Documents).
15. Notify the alarm center of the end of the procedure.