Semi-auto mode description
When the generator breaker is closed and the mains breaker is opened, the controller will use the nominal frequency as set point for
the speed governor. If AVR control is used, the nominal voltage is used as set point.
When the generator is paralleled to the mains, it will be controlled so the imported power from the mains will be kept at 0 kW. If AVR
control is used, then the set point will either be adjusted power factor or reactive power (7050 Fixed power set).
INFO
For a general description of the available running modes, see Running modes.
2.4.11 Mains power export (fixed power to mains)
Auto mode description
The mains power export mode can be used to maintain a constant level of power through the mains breaker. The power can be
exported to the mains or imported from the mains, but always at a constant level.
INFO
If a fixed level of imported power must be used, it is still the mains power export mode that must be selected! This mode
covers import as well as export.
The genset starts as a result of a digital start command. It synchronises to the mains and will start to export power to the mains. The
amount of power exported will be kept at a fixed level regardless of the load on the busbar (the factory).
The stop command will cause the genset to deload and trip the generator breaker. Afterwards, it will cool down and stop.
A 4-20 mA transducer is used for indication of the power exported from the mains, see Mains power transducer.
Diagram, mains power export - example
Mains power export
setpoint
Ramp up
Ramp down
kW
t
Start signal
Stop signal
INFO
Note that the set point of the mains power export can be 0 kW. This means that the genset will be parallel to the mains but
no power import or export.
Semi-auto mode description
When the generator breaker is closed and the mains breaker is opened, the controller will use the nominal frequency as set point for
the speed governor. If AVR control is used, the nominal voltage is used as set point.
DESIGNER'S HANDBOOK 4189341275A EN Page 24 of 196
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