6.5 MAINS DECOUPLING ALARMS
NOTE: These protections only operate only when the mains and generator bus are in
parallel, it is disabled at all other times.
When the mains (utility) and the generator bus supplies are in parallel, the module monitors for a
Mains failure by detecting ROCOF or Vector Shift fault which are set in the module’s configuration.
Should either of these alarms operate, the module performs an electrical trip of the common generator
bus or a mains failure. This operation must be manually reset by:
1) Pressing the Stop/Reset Mode button. The generator bus load switch opens and the
generator start request is removed if it is still running and the alarm is cleared.
2) Activation of a digital input configured to Clear Mains Decoupling Alarms if it has been
configured.
3) Pressing the Alarm Mute/Lamp Test and Tick buttons together for a small
duration.
4) To clear the Mains Decoupling alarm without pressing the Stop/Reset Mode button or
activating a digital input configured for Clear Mains Decoupling Alarm.
1) Press and hold the Tick button to enter the ‘running’ configuration editor.
2) Press the Instrumentation Scroll buttons to cycle to the Auxiliary Mains Fail
/ Out Of Sync Reset parameter.
3) Press the Tick button to edit the parameter. The parameter begins to flash to
indicate that the parameter is being edited.
4) Press the Instrumentation Scroll buttons to adjust the parameter to Active.
5) Press the Tick button to stop editing the paramter. The parameter ceases
flashing to indicate that it the parameter is no longer being edited.
6) Press and hold the Tick button to exit the ‘running’ configuration editor.
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