External Alarm Output - NorthStar MX500 Operator's & Installation Manual

Installation Manual

External Alarm Output

The MX 500 Ext. alarm output connection is on pins 3 and 4 of the AUX
(8-pin) cable. They are held open (floating) during normal operations. In
an alarm condition, the external alarm pin is switched to ground poten-
tial. When an alarm condition is cleared or acknowledged, the Ext.
alarm signal will return to open condition automatically (refer to table
below for relay conditions). However, it is possible to retain the external
alarm condition by setting the "Retain external alarm:" to ON. At this
setting, the external alarm signal can only be cleared by correcting the
problem.
214
Ext. Alarm Relay Conditions
MX500 turned OFF Energized
MX500 Turned ON
Not Energized
(No Alarm)
MX500 Turned On
Energized
(With Alarm)
12 VDC Input Power
Energized
Failure
Installation Notes
Version 3.0