All changes of requested gen-set load (except in load-sharing mode) are not
made as one step, but are ramped – i.e. the requested load is changing
slowly with the rate adjusted by this setpoint.
The rate is adjusted in seconds for 100% load change (from 0 to 100% of
nominal power). So if the requested load change is 50% of nominal power,
the ramp duration will be 50% of this setpoint.
The ramp takes place in the following situations:
ï‚· The gen-set has been just synchronized and is ramping up to the
target load level (e.g. baseload in parallel to mains operation or
average gen-set load in multiple load-sharing operation)
ï‚· The gen-set is running parallel to the mains and baseload is
changed.
ï‚· The gen-set is being unloaded before opening the GCB and stop. In
this case the end load level is adjusted by the setpoint GCB Open
Level and the timeout for unloading is adjusted by the setpoint GCB
Open Del.
After a stop command has been issued in parallel to mains or other gen-sets
operation, the gen-set load is ramped down before the GCB will open. Use
this setpoint to adjust the end-point of the ramp, e.g. the load level (in % of
Nominal Power) where the GCB will be opened.
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