Parameter Range Default Comment
Enable Not enabled, Enabled Not enabled
Not enabled: The controller does not activate the Priming output.
Enabled: After the engine stops, the controller activates the Priming output for
the period configured under ON timer. The controller then deactivates the
output for the period configured under OFF timer. The on and off cycle repeats
until the engine starts.
ON timer 0 s to 1 h 5 s The priming period.
OFF timer 0 s to 1 h 30 s The interval between each priming.
8.6.3 Temperature-dependent power derating
The temperature-dependent power derating function reduces the genset nominal load by reducing the genset nominal power used
by load sharing. The derating function can be configured for up to three temperature measurements.
Inputs and outputs
Assign the temperature measurement analogue input function under Configure > Input/output. Select the hardware module, then
select the input to configure.
Function
I/O Type Details
Engine > Power derate > Derate #
temperature [C] (where # is 1 to 3)
Analogue input
The measurement must be
in °C.
This can measure any temperature,
for example, the engine cooling water.
Parameters
Configure these parameters under Configure > Parameters > Engine > Power derate #, where # is 1, 2 or 3.
INFO
The analogue input(s) must be configured to see the power derate parameter and curve.
Parameter Range Default Comment
Enable derate
Not enabled,
Enabled
Not enabled
Not enabled: The load sharing uses the genset nominal power, no matter what
the derate temperature is.
Enabled: The controller uses the power derating curve to derate the power for
load sharing within the configured range. See How it works.
Setup Use this section to set up the power derate curve.
More information
See Parameters, Tasks, Edit a parameter curve in the PICUS manual for more information.
How it works
By default, the genset nominal power is 100 % for temperatures up to 90 °C. If there is a Derate temperature input, then the power is
derated linearly to 80 % at 130 °C. However, you can create a customised curve for each temperature input.
Power derate affects load sharing, since load sharing is based on a percentage of nominal power.
The derating does not affect the alarms.
DESIGNER'S HANDBOOK 4189340911K UK Page 305 of 521
To Next Page
Loading...
