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Critical Reflash
Upon a critical alarm, the relay output changes state. Every new critical alarm will
pulse the relay output for approximately ½ second. The relay output will return to
its normal state when all critical alarms have returned to normal.
Non-Critical Reflash
critical. Upon a non-critical alarm, the relay output changes state. Every new non-
critical alarm will pulse the relay output for approximately ½ second. The relay
output will return to its normal state when all critical alarms have returned to
normal.
Critical Fault This relay output will change state when any critical input is in the
alarm state. The relay output will only return to its normal state when all critical
alarms have returned to normal. The relay output is not affected by the silence or
acknowledge pushbutton.
Non-Critical Fault
input is in the alarm state. The relay output will only return to its normal state
when all non-critical alarms have returned to normal. The relay output is not
affected by the silence or acknowledge pushbutton.
Power Fail
This relay output will change state when the Power is lost. The
relay coil is energized upon start-up and the contacts will transfer upon a loss of
power.
Ground Fault This relay output will change state when a ground fault condition is
detected. (Note: Must have Ground Fault Detector Option GF)
The ground fault can be either a positive ground (+FCV wire to ground) or a
negative ground (FCV return wire to ground).
Watchdog
System healthy output. It will activate when the system is not
processing alarms, like during the configuration process or when there is a
system failure. The Watchdog will detect when there is a remote communication
failure, if Modbus or DNP are used. The communication failure would activate
after a period of inactivity, including a disconnected or broken cable.
The Configuration Screen will show a summary of the Common Relay functions
to the right. To select a relay to edit use the up or down arrows beside the relay
number or click on the entry in the summary.
Note: In addition to these configurations, the repeat relay contact may be
selected as a Form A or (Normally Open) or Form B (Normally Closed) using the
I/O jumpers described in the previous section.
Common Functions
A number of system-wide functions are available through the Common Service
Module. To select a function click on the white box to the right of the name so as
a tick mark appears. To turn the function off click on the box again so as the tick
is removed. The available functions are:-
Grouped output driven by any alarm selected as critical.
Grouped output driven by any alarm selected as non-
This relay output will change state when any non-critical
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Series 90B
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