User’s Manual GC315xx-GC400xx 25
3) Press the “GCB” switching button and check that the “GCB” and “BUS LIVE” lights are
ON.
The Load is now powered by the Generator. When the Mains returns after the Black out and/or
the restoration of the fault, “MAINS LIVE” light ON, switching of the Load to Mains can be performed.
It is the operator decision to keep the power supply from the Generator.
INFORMATION! : The switching of the Load to the Mains causes the Black out on the Load for
the time necessary to correctly switch the contactors.
Switching is enabled by pressing the “MCB” button. The Load is then powered again by the Mains.
The gen-set will remain on until the “STOP” button is pressed by the operator.
INFORMATION! Ideally do not stop the Gen-set immediately after switching the Load to the
Mains, but leave it on for the necessary time for the engine to cool. To stop the engine, press the
“STOP” button.
In this mode the main task of the device is to ensure the electrical power to the Load in any situation.
To implement this task, the device continuously monitors the Mains for voltage/frequency faults,
phase failure or phase unbalance.
Sequence with Mains present:
If the Mains is within the normal values configured during installation, contactor MCB is
closed and the Load is powered by the Mains. The Gen-set is inactive and contactor GCB
is open.
Sequence with Mains blackout:
If the values of the Mains are different from that configured during installation (e.g. in the
event of a Black out), and therefore the Load is no longer correctly powered, the device will
begin the starting sequence of the generator set. You have:
1) Engine start command: opening command of the fuel solenoid valve and/or command
on the actuator and/or command CANBUS J1939 to the engine ECU (with the
maximum number of start attempts and duration of the command set by parameters
configured). Activation of the lockout with acoustic warning if the engine has not started
after the attempts.
2) Stand-by with voltage/frequency monitoring until the stable operating conditions of the
Generator . Lockout activation with acoustic warning if after the set time the Generator
has not reached the normal values for the switching of the Load.
3) Switching command between MCB and GCB with the consequent handling of the Load
load on the Generator.
4) The generating set continues to supply power to the Load, monitors continuously the
electrical values of the Mains and the Generator, checks that the engine protections are
enabled and ready to intervene; all awaiting the return of the Mains voltage at the correct
parameters.
Return of Mains power after Black out
The Load line is powered by the Generator with GCB closed and MCB open, but the Mains
is returning after the Black out. If the Mains is considered stable and within the tolerance
(normal value), the device starts the Mains return sequence with the standard procedure.
1) Switching command between GCB and MCB with the consequent handling of the Load
load on the Mains.
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