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D-500 MK2 User Manual
34. SOFTWARE FEATURES
34.1. LOAD SHEDDING / DUMMY LOAD
The load shedding feature consists on the disconnection of the least crucial loads when the genset power
approaches to its limits. These loads will be supplied again when the genset power falls below the
programmed limit. The internal Load Shedding function is always active. Any digital output may be used
as the load shedding output.
The dummy load function consists on the connection of a dummy load if the total genset load is below a
limit and to disconnection of the dummy load when the total power exceeds another limit. The dummy
load function is the inverse of the load shedding function, thus the same output may be used for both
purposes.
It is also possible to control more complex external systems with multiple steps, using LOAD_ADD and
LOAD_SUBSTRACT output functions. Any digital output may be assigned to these signals.
When the load is above the Load Shedding High Limit, the controller will activate the Load Shedding
output.
When the load is below the Load Shedding Low Limit, the controller will release the Load Shedding
output.
The parameters used in Load Shedding feature are in the Electrical Parameters Group:
Load Shedding Low Limit: If the genset power goes below this limit then the load shedding relay will be
deactivated.
Load Shedding High Limit: If the genset power goes above this limit then the load shedding relay will be
activated.
t
:
the load goes below the Load Shedding Low Limit, thus the Load Shedding output becomes inactive.
1
t
:
the load goes above the Load Shedding High Limit, thus the Load Shedding output becomes active.
2
t
:
the load goes below the Load Shedding Low Limit, thus the Load Shedding output becomes inactive.
3
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Firmware V-6.3
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