RELAY

TERMINAL

 

OUTPUT

DESIGNATION

USER ALARM NOTES

 

NO-NC-C

 

 

J1

 

RELAY #1

NO1-NC1-C1

________________________

RELAY #2

NO2-NC2-C2

________________________

RELAY #3

NO3-NC3-C3

________________________

RELAY #4

NO4-NC4-C4

________________________

 

J2

 

RELAY #5

NO5-NC5-C5

________________________

RELAY #6

NO6-NC6-C6

________________________

MINOR

NO7-NC7-C7

________________________

MAJOR

NO8-NC8-C8

________________________

Figure 3.7-2 Output Relay Connections

3.8. 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 3.8-1 External Alarm Input Definition

Connector J4 is located on the interface card mounted in the top left side of the unit. Refer to Figure 3.7-1for 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.

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 3.8-2 External Alarm Input Connections

MX28B400 +24 VDC User’s Manual

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American Power Conversion MX28B400 user manual External Alarm Input Connections, No-Nc-C