nvent 910 Series Installation, Operating And Maintenance Instructions page 11

S 1 Sense (WHT)
TS 1 Common (RED)
Shield
TS 2 Source (WHT)
TS 2 Sense (WHT)
TS 2 Common (RED)
2.7.2 ALARM RELAY CONNECTIONS
Two types of alarm relays are provided: one is a programmable dry contact output relay and
the other is a line voltage AC relay (Triac). Both may be programmed for N.O., N.C., steady or
flashing operation, and are typically used to annunciate an alarm to an external device such as
a DCS, PLC, etc.
Notes:
• Both alarm relays are controlled by the 910 using the same signal. The N.O., N.C., and
flashing parameter settings affect both the dry contact and the AC alarm relays.
• The dry contact alarm relay is intended to be used for switching low-voltage, low-current
signals. Do not use this relay to directly switch line voltages. Ensure that your application
stays within the ratings of the relay contacts as defined in Appendix A.
The AC alarm relay alarm relay is typically used to drive a local, external, line-voltage pilot light,
etc. Refer to the wiring diagrams in Appendix C for example connection details.
Dry Contact Alarm and Control Signals
Alarm relay dry contact output
Alarm relay dry contact output
Ground
+12Vdc nom. Out
AC Alarm and Control Signals
L1/Line out
L2/Neutral out
AC alarm relay
AC alarm relay
2.7.3 EXTERNAL CONTACT INPUT/OUTPUT
These input terminals are used to implement the inhibit and override features.
Refer to Section V of this manual for programming details, and Appendix C for example
wiring diagrams.
Miscellaneous Signals
External input (+)
External input (-)
2.7.4 COMMUNICATION SIGNAL CONNECTIONS
The communications terminal assignments change based on the type of option installed.
Ifpresent in a 910 Control Module, the type of communications interface will be identified by a
label located on the front of the control module (Figure 2.1).
Communications wiring should use nVent RAYCHEM twisted pair, shielded cable. Shields on
communications wiring should be grounded at one end only, using the terminals provided.
21
22
8
9
10
11
Terminal No.
14
15
4
3
Terminal No.
1
2
12
13
Terminal No.
6
7
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