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Omni8/16C/Omni8P User Manual
UMC1480R24.pdf
47
© Omniflex 2021
4.11.1
Switch Set Mode
In “Switch-Set” mode the functions of these relays are predefined as follows:
Table 4-7 – Relay Functions
RELAY
FUNCTION
Description
RL1
Watch-dog
A normally open contact is provided from this relay.
This relay is derived from the hardware watch-dog circuitry in
the Omni8/16C. If the hardware watch-dog detects a failure,
then this relay will de-energise, and the contact will open. This
output can be used in critical applications to monitor the
health of the Omni8/16C.
RL2
Horn
A normally open contact is provided from this relay.
This relay is de-energised with no alarms present and will
energise when an alarm occurs causing the audible to be
sounded. This contact will close to sound the audible device.
RL3
Group Alarm A change-over contact is provided from this relay.
This relay acts as a Group Alarm output for the Omni8/16C.
There are various modes of operation of this Group Alarm.
See Section 5.5 for further details of these modes.
RL4
Not Used
A change-over contact is provided from this relay.
This relay is not used in Switch-Set mode, and will remain de-
energised.
4.12
Connecting Control Pushbuttons
CAUTION: External Pushbuttons are powered from the internal circuitry of the alarm annunciator. Do NOT
connect the external pushbuttons to any external power supply.
4.12.1
Controlling a single Omni8/16C with internal pushbuttons
When a single Omni8/16C is fitted with a C1420 Integral Pushbutton Station, no external wiring of
pushbuttons is required and Terminals C-11 to C-15 on the rear of the unit are left unconnected.
4.12.2
Controlling a single Omni8/16C with external pushbuttons
External Test, Silence Acknowledge and Reset pushbuttons may be connected to the Omni8/16C via
Terminals D-11 to D15 as shown in the following schematic:
Figure 4-10 – External Pushbuttons controlling a single Omni8/16C
Terminal Strip
D
11
12
13
14
15
COM
RES
SIL
ACK
TEST
External
Control
PushButtons