Emerson MPR25, MPR15 Series Appendix B NT5C10CO shelf, General, NT5C10CO power shelf Description

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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.

25A Switch Mode Rectifier NT5C06B / C Installation and User Manual