D-500 MK3 User Manual Firmware V-14.2
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The AUTO mode is entered by pressing the button.
The AUTO mode is used for the automatic operation of the genset system.
▪ AMF Mode: The controller will constantly monitor the mains availability. It will run the engine and
transfer the load when a mains failure occurs.
▪ Synchronizing & Load Sharing Mode: The controller will monitor the REMOTE START signal.
When the signal arrives, it will run the genset, synchronize to the busbar, get in parallel, ramp up and
start sharing the load. Depending on settings, the controller may decide to stop the genset, or restart
it anytime in order to achieve the necessary available power on the busbar.
▪ ATS Mode: The controller will constantly monitor the mains availability. When a mains failure occurs,
it will activate its REMOTE START output, thus the genset group will run and the controller will
transfer the load. When the mains is back again, it will open the genset contactor and it will close the
mains contactor.
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 at idle speed during Idle Speed Timer.
• The engine will run unloaded during engine heating timer.
• If alternator phase voltages, frequency and phase order are correct, the unit will wait for the
generator contactor period and the generator contactor will be energized.
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