Deif SGC 420 User Manual page 54

During normal operations, the mains supplies the load. If there is a mains failure, the controller automatically starts the
genset and switch to generator supply (see the flowchart above). Once the genset loading voltage and frequency are more
than their minimum set points, the Warm-up delay timer starts. When the Warm-up delay timer expires, the timer for the
load transfer delay starts, and the genset breaker closes. When the mains returns, the controller synchronises the mains
breaker to the busbar when the Return to mains delay timer has expired. The genset cools and then stops.
If there is still a mains failure after the genset has cooled down and stopped, the controller starts the genset again. At the
end of the cycle, the genset cools down and then stops. This cycle continues until the mains returns. If the mains returns
during a cycle, the controller synchronises the mains breaker to the busbar when the Return to mains delay timer has
expired. The genset cools and then stops. The timer for the genset operating cycle is also reset.
You must clear all alarms before the controller can start the genset. Once you have cleared the alarms, the genset starts if
there is still a mains failure.
Module > Cyclic Mode
Parameter
Cyclic Mode
Genset Off Time
Genset On Time
Timers
Timers > Start/Stop
Parameter
Warm-Up Delay
Return To Mains Delay
Load Transfer Delay
Minimum voltage and frequency set points
Generator > Alternator Configuration
Parameter
Min Healthy Voltage
Min Healthy Frequency
User manual 4189341341B EN
Range
Enable
Disable
1 to 720 min.
1 to 720 min.
Range
0 to 60 s
0 to 600 s
1 to 60 s
Range
10 to 100 %
10 to 100 %
Default
Not enabled
15 min.
15 min.
Description
Tick the box to enable this mode.
Time duration for which the genset is not
in operation.
Time duration for which the genset is in
operation.
Default
3 s
5 s
1 s
Default
40 %
40 %
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