A 4 to 20 mA transducer is used for indication of the power imported from the mains, see Mains power transducer.
Diagram, peak shaving – example
t
kW
Max. mains import level
Genset start level
Genset stop level
Genset minimum load
Peak/total power
Mains power
Generator power
t
STOP
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, the generator will be controlled according to the peak shaving set point. So the
maximum mains import will not be exceeded in spite of the semi- auto mode. If AVR control is used, then the set point will either be
adjusted power factor or reactive power (7050 Fixed power set).
Peak shaving parameters
Menu
Description
7000 Mains power Day and night The mains power import limits for the peak shaving.
7010 Daytime
period
These settings define the daytime period. The hours outside the daytime period are
considered to be the night-time period.
7020 Start
generator
Start set point The start set point is in percent of the day and night settings in menu 7000 Mains power.
Delay
The genset will start when the start set point has been exceeded and this delay has
expired.
Load The minimum load the genset will produce when parallel to mains.
7030 Stop
generator
Stop set point The stop set point is in percent of the day and night settings in menu 7000 Mains power.
Delay The genset will stop when the stop set point has been exceeded and this delay has expired.
INFO
Parameters 7020 and 7030 are used to define the starting and stopping point of an application without power management
(option G5). If power management is used, then load-dependent start and stop parameters are used. For more information
on load-dependent start and stop, see Option G5.
DESIGNER'S HANDBOOK 4189341275A EN Page 22 of 196
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