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32
Switch Installation
Connecting Alarm Circuits
Alarm signals are connected to the switch through the six-pin alarm connector. Three connections are dedicated to the
two alarm input circuits: alarm input 1, alarm input 2, and a reference ground. An alarm input and the reference ground
wiring connection are required to complete a single alarm input circuit. The three remaining connections are for the alarm
output circuit: a normally open output, a normally closed output, and a common signal. An alarm output and the common
wiring connection are required to complete a single alarm output circuit.
The labels for the alarm connector are on the switch panel and are displayed below.
Warning:
Explosion Hazard—Do not connect or disconnect wiring while the field-side power is on; an electrical arc
can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or that
the area is nonhazardous before proceeding. Statement 1081
Caution:
The input voltage source of the alarm output relay circuit must be an isolated source and limited to less
than or equal to 24 VDC, 1.0 A or 48 VDC, 0.5 A.
Note:
Wire connections to the power and alarm connectors must be UL- and CSA-rated, style 1007 or 1569 twisted-pair
copper appliance wiring material (AWM) wire (such as Belden part number 9318).
To wire the switch to an external alarm device, follow these steps:
1.
Remove the captive screws that hold the alarm connector on the switch, and remove the connector from the switch
chassis. See
Figure 16 on page 33
.
Label
Connection
NO
Alarm Output Normally Open (NO) connection
COM
Alarm Output Common connection
NC
Alarm Output Normally Closed (NC) connection
IN2
Alarm Input 2
REF
Alarm Input Reference Ground connection
IN1
Alarm Input 1