Emerson MPR25 NT5C10KC, NT5C10CO, Installing the rectifier, Procedure 9 - Rectifier installation

Installation and start-up procedures 57

NT5C10KC

This option is offered to provide an AC Fail Alarm upon loss of the input line power. Selectable for 120 or 208 / 280 V AC operation, the circuit provides a dry C form contact relay, TB1-1 (NC) and TB1-2 (C), to send an alarm. See User Manual (UM) supplement P0803489 for more information.

NT5C10CO

This power shelf houses two rectifiers. One rectifier operates in the standard mode (no delay) and the other is inhibited for a fixed amount of time after an AC power failure. The delayed start is required to allow time for the batteries to recharge, and the required total AC input current for the two rectifiers to 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 transmit an RFA signal to the Controller after the delayed start period, if the DC or AC circuit breaker is open.

When the rectifier is on the delayed start mode, the RFA LED on the rectifier will be lit (red). The “DELAYED START” yellow LED of the timer will be ON indicating that the rectifier with the red RFA LED is on delayed start mode.

See Appendix B for additional information on the NT5C10CO shelf.

Installing the rectifier

Procedure 9 - Rectifier installation

Step	Action
1	Release the clamping bar and remove the blank panel with a lifting
	motion, dislodging the lower tables, and place the panel at the bottom of
	the shelf.
2	Ensure that the AC and DC circuit breakers of the rectifier (about to be
	plugged in) are OFF (in the down position).
3	Ensure that the AC line input is 110 / 120 V AC nominal for the MPR15
	and 208 / 240 V for the MPR25.
4	Slide the rectifier into the shelf, resting it on top of the stored blank
	panel.
5	Ensure that the rectifier is firmly slid into position.
6	Re-install the clamping bar by tightening the two captive screws.
	–end–

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