IDU (all models) Alarm Connector Appendix B
FA4800 User Manual Release 1.9.40 B-4
The figure below, shows how to connect external input and output alarms.
Figure B-1: Example for connecting the alarm connector
Output 3 Normally Open 7
Output 3 Common 8
Output 3 Normally Closed 9
Output 4 Normally Open 10
Output 4 Common 11
Output 4 Normally Closed 12
Note
• Use an external current limit resistor to limit the current at the output
relays to 1 Amp. Such resistor is not required if the equipment con-
nected to the IDU supports current limiting to 1 Amp.
• The voltage of the input alarm must be within the range of -10 to -50
VDC.
Table B-7: IDU Alarm Connector (Dry-Contact) (Continued)
I/O Description Pin
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