AGC Designer’s Reference Handbook
DEIF A/S Page 66 of 168
6. Additional functions
This chapter describes the additional functions.
Start functions
The unit will start the gen-set when the start command is given. The start sequence is
deactivated when the remove starter event occurs or when the running feedback is present.
The reason for having two possibilities to deactivate the start relay is to be able to delay the
alarms with run status.
If it is not possible to activate the run status alarms at low revolutions, the remove starter
function must be used.
An example of a critical alarm is the oil pressure alarm. Normally, it is configured according to
the shutdown fail class. But if the starter motor has to disengage at 400 RPM, and the oil
pressure does not reach a level above the shutdown setpoint before 600 RPM, then, obviously,
the gen-set would shut down, if the specific alarm was activated at the preset 400 RPM. In that
case, the running feedback must be activated at a higher number of revolutions than 600 RPM.
Digital feedbacks
If an external running relay is installed, then the digital control inputs for running detection or
remove starter can be used.
Running feedback
When the digital running feedback is active, the start relay is deactivated and the starter motor
will be disengaged.
t
RPM
Oil
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