American Power Conversion MX28B4800 External Alarm Input Connections, Relay, Terminal, No-Nc-C

RELAY	TERMINAL
OUTPUT	DESIGNATION	USER ALARM NOTES
	NO-NC-C
RELAY #1	NO1-NC1-C1	________________________
RELAY #2	NO2-NC2-C2	________________________
RELAY #3	NO3-NC3-C3	________________________
RELAY #4	NO4-NC4-C4	________________________
RELAY #5	NO5-NC5-C5	________________________
RELAY #6	NO6-NC6-C6	________________________
MINOR	NO7-NC7-C7	________________________
MAJOR	NO8-NC8-C8	________________________

Figure 3.9-2 Output Relay Connections

3.10. External Alarm Input Connections

Four external alarm inputs with assignable priority levels are available. These alarm inputs respond to external dry contact closures between normally open (NO) and common (C) or contact openings between normally closed (NC) and C.

External Alarm Source	Connect To Input
(non-alarm state)	Alarm Terminals
OPEN	NO-C
CLOSED	NC-C

Figure 3.10-1 External Alarm Input Definition

Connector J4 is located on the interface card mounted in the top left side of the unit. Refer to Figure 3.9-1 for Interface board connections. Systems are shipped with jumper wires connecting each NC and corresponding C contact. A jumper wire should be removed only if the corresponding NC-C contacts are going to be used. To attach the Input Relay wires, push down on the white spring-loaded lever; insert the wire and release the lever.

EXTERNAL

ALARM

INPUT

#1

#2

#3

#4

J4 TERMINAL DESIGNATION (NO-NC-C) NO1-NC1-C1NO2-NC2-C2NO3-NC3-C3NO4-NC4-C4

USER ALARM NOTES

___________________________

___________________________

___________________________

___________________________

Figure 3.10-2 External Alarm Input Connections

MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 25