DKG-325 User Manual Firmware V-56
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The AUTO mode is entered by pressing the
button.
The AUTO mode is used for the automatic transfer between genset and mains. The controller will
constantly monitor the mains availability. It will run the engine and transfer the load when a mains failure
occurs.
The mains availability evaluation sequence is below:
If at least one of the mains phase voltages or the mains frequency is outside limits, the mains will
be supposed failing. Otherwise mains is available.
If a Simulate Mains signal is present, then mains are made available
If a Force to Start signal is present, then mains are unavailable
If a Remote Start input is defined, then this signal decides of mains availability.
When mains are evaluated as “unavailable” then an engine start sequence begins:
The unit waits during Engine Start Delay for skipping short mains failures. If the mains is restored
before the end of this timer, the genset will not start.
The unit turns on the fuel and preheat glow plugs (if any) and waits for preheat timer.
The engine will be cranked for programmed times during crank timer. When the engine fires, the
crank relay will be immediately deactivated. See section
Crank Cutting
for more details.
The engine will run unloaded during engine heating timer.
If alternator phase voltages and frequency are correct, the unit will wait for the generator
contactor period and the generator contactor will be energized.
When mains are evaluated as “available” again then an engine stop sequence begins:
The engine will continue to run for the mains waiting period to allow mains voltages to stabilize.
Then the generator contactor is deactivated and the mains contactor will be energized after
mains contactor timer.
If a cooldown period is given, the generator will continue to run during the cooldown period.
Before the end of cooldown, the unit will reduce the engine speed to idle speed.
At the end of cooldown, the fuel solenoid will be de-energized, the stop solenoid will be energized
for Stop Solenoid timer and the diesel will stop.
The unit will be ready for the next mains failure.
8.4. AUTO MODE
