Genset mode Running mode
Multiple gensets, analogue load sharing (hardware option M12) X X X X X
Multiple gensets, power management X X (X) X X
Remote maintenance with one genset X X
INFO
For a general description of the available running modes, see Running modes.
2.4.2 AMF (no back synchronisation)
Auto mode description
The controller automatically starts the genset and switches to generator supply at a mains failure after an adjustable delay time. It is
possible to adjust the controller to change to genset operation in two different ways.
1. The mains breaker will be opened at genset start-up.
2. The mains breaker will remain closed until the genset is running, and the genset voltage and frequency is OK.
In both cases, the generator breaker will be closed when the generator voltage and frequency is OK, and the mains breaker is open.
When the mains returns, the controller will switch back to mains supply and cool down and stop the genset. The switching back to
mains supply is done without back synchronisation when the adjusted Mains OK delay has expired.
Semi-auto mode description
When the generator breaker is closed, the controller will use the nominal frequency as the set point for the speed governor. If AVR
control is used, then the nominal voltage is used as set point.
INFO
For a general description of the available running modes, see Running modes.
2.4.3 AMF (with back synchronisation)
Auto mode description
The controller automatically starts the genset and switches to generator supply at a mains failure after an adjustable delay time. It is
possible to adjust the controller to change to genset operation in two different ways:
1. The mains breaker will be opened at genset start-up.
2. The mains breaker will remain closed until the genset is running, and the genset voltage and frequency is OK.
In both cases, the generator breaker will be closed when the generator voltage and frequency is OK, and the mains breaker is open.
When the mains returns, the controller will synchronise the mains breaker to the busbar when the "Mains OK delay" has expired.
Then the genset cools down and stops.
INFO
The automatic mains failure mode can be combined with the Overlap function. In that case, the generator breaker and the
mains breaker will never be closed at the same time for a longer period than the adjusted Overlap time.
Semi-auto mode description
When the generator breaker is closed and the mains breaker is opened, the controller will use the nominal frequency as the set
point for the speed governor. If AVR control is used, the nominal voltage is used as the set point.
When the generator is paralleled to the mains, the governor regulation will no longer be active. If AVR control is used, then the set
point will either be adjusted power factor or reactive power (7050 Fixed power set).
DESIGNER'S HANDBOOK 4189341275A EN Page 17 of 196
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