Deif SGC 420 User Manual page 48

Cyclic mode
DG OFF
Mains unhealthy/OFF time expired
Warm up
Warm up delay expired
DG ON
Mains healthy/ON time expired
Return
to Mains
Return to mains delay expired
Engine
cooling
Cyclic mode is used to run the genset for a pre-specified time for a maximum cycle of 12 hours. The genset running time is
configurable.
Mains is monitored in this mode. The load is on mains when the mains is healthy. If mains is unhealthy, controller gives a start
command to the genset. The genset starts according to the Start sequence. When genset loading voltage and frequency are above
the Minimum healthy thresholds, the Warm-up delay timer starts. At the end of the Warm-up delay, the Load transfer delay starts
and the genset latches. Engine running hours increase while the genset runs. The running hours stop increasing when a Stop
command is received. After completion of the ON time or if mains become healthy during the ON time, the controller opens the
genset contactor, and the Engine cooling time starts. At the end of Engine cooling time, the controller initiates the Stop sequence by
giving a Stop command. When the genset is OFF, the controller starts the genset OFF time.
After the DG OFF timer expires, the DG ON timer starts. This cycle continues until the mains is healthy. If mains is healthy during
any time in the cycle, both timers are reset to zero and the load shifts to mains when the Return delay expires. This process is
repeated during Cyclic mode.
If the genset shuts down or is unable to start because an alarm is present, the DG ON time will be taken first, followed by the DG
OFF time after clearing alarms if mains is unhealthy.
USER MANUAL 4189341227A UK
Engine
cooling
time
expired
Page 48 of 86