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INM 725B Rev 21
The common relay will therefore act in accordance with the selected “group operation” which
can be one of the following:-
First-Up
Activates when the first alarm occurs within a group.
Input
Activates on alarm and remains active until the input has returned to normal.
Alarm
Activates on alarm and remains active until the input has returned to normal and the alarm
has been reset to the off state.
Audible
Activates on alarm and remains active until the mute or acknowledge pushbutton has
been pressed.
6 .2 Group Relay with Reflash
A common relay can be set to reflash each time a new event occurs within the group to prevent
subsequent events being masked by a standing alarm.
6 .3 Pushbutton Follower Relay
Any common relay can be set to follow the action of any pushbutton.
The common relay function should be set to match the required pushbutton i.e. if lamp test is
selected the common relay contact will activate in sympathy when the lamp test pushbutton is
pressed.
6 .4 Diagnostic / Watchdog Relay
Any common relay can be set to operate as diagnostic / watchdog relay to provide a volt
free contact for use with 3rd party devices to indicate that a fault has occurred within the
annunciator.
The following options are available:-
6 .5 All Faults Monitoring
The common relay will activate when any error is detected within the system.
6 .6 Field Contact Monitoring
If the signal supply used to initiate each alarm channel is lost or the internal signal supply
protection fuse has blown the relay will change state and will remain in the abnormal state until
power has been restored. In addition the system can provide an indication of line resistance.
6 .7 System Fault Monitoring
If a system fault is detected within the unit the relay will change state and will remain in the
abnormal state until the system is functioning correctly.
