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MX28B600-48V
15
Figure 5.6 Interface Board
5.6.1 External Alarm Inputs
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 (see Table 5.6-1).
Table 5.6-1. External Alarm Input Definition
Table 5.6-2 shows the external alarm input connection designations. Connector J4 is located on
the interface card mounted in the top left side of the unit. 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
J4 TERMINAL
DESIGNATION
(NO-NC-C)
USER ALARM NOTES
#1
#2
#3
#4
NO1-NC1-C1
NO2-NC2-C2
NO3-NC3-C3
NO4-NC4-C4
___________________________
___________________________
___________________________
___________________________
Table 5.6-2. External Alarm Input Connections
External Alarm Source
(non-alarm state)
Connect To Input
Alarm Terminals
OPEN
CLOSED
NO-C
NC-C