Supervised Alarm / Relay / Power Expansion Unit 18
RELAY CONNECTIONS
Description
Each Alarm/Relay board provides sixteen Form C relays to
control Area Entry, Shift Signaling Devices, etc. If used to
control high-voltage equipment such as outdoor lighting used
in parking areas, a suitably-wired external relay must be added
to switch the high-voltage equipment.
Relay Characteristics
The relays all share the following characteristics:
•
Form C relay with a contact rating of 2A at 24V AC/DC.
•
The Normally Open (NO), and the Normally Closed (NC)
contacts are the default state of non-energized relays. An
LED located near each relay will light when the associated
relay is activated.
•
Metal oxide varistors (MOVs) are placed across the con-
tacts to reduce electrical noise. The MOVs limit any noise
caused by the switching an inductive load to 56 volts.
NOTES:
•
Installing a 56V MOV at the controlled device further re-
duces possible noise input.
•
Additional MOVs are available from Continental Instru-
ments as part number R783R.
•
Because of this noise, relay wiring MUST NOT be put in
the same conduit with other wiring.
RELAY CONNECTIONS
Figure 11 - Relay Contact and Accessory Power Outputs
RLY 1
RLY 2
RLY 3
RLY 4
RLY 5
RLY 6
RLY 7
RLY 8
RLY 9
RLY 10
RLY 11
RLY 12
RLY 13
RLY 14
RLY 15
RLY 16
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
