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25A Switch Mode RectifierNT5C06B / C Installation and User Manual
Appendix B: NT5C10CO shelf
General
This appendix contains supplementary information for the NT5C10CO
"DELAYED START" power shelf.
NT5C10CO power shelf
Description
The power shelf houses two rectifiers. One rectifier operates in the standard
mode (no delay) and the other is inhibited for a fixed time after an AC power
failure. The delayed start is required to allow time for the batteries to be
sufficiently charged, in order that the required total AC input current for the
two rectifiers be reduced to less than 20 amperes.
The rectifier that is delayed will be activated immediately if the main rectifier
fails, is pulled out or missing, or produces an RFA. The delayed start rectifier
will not transmit an RFA signal to the Controller during the time that it is
inhibited, but it will permit transmission of an RFA signal to the Controller
after the delayed start period.
When the rectifier is on the delayed start mode, the RFA LED on the
rectifier will be lit (red), and the "DELAYED START" yellow LED of the
timer will be ON to indicate that the rectifier with the red RFA LED is on
delayed start mode.