Temperature-dependent power derating example
There are two 1000 kW gensets in the system. For genset A, the power derate curve is 100 % until 80 °C, then linearly
down to 70 % at 100 °C. Genset B does not have power derating.
The genset A temperature is 90 °C. The system load is 1480 kW.
The derated nominal power for genset A is 85 % of the nominal power, that is, 850 kW. The total genset nominal power is
1850 kW.
For equal load sharing, each genset runs at 1480 kW / 1850 kW × 100 % = 80 % of their nominal load. Genset A runs at
680 kW, and genset B runs at 800 kW.
8.6.4 Engine operating values as analogue outputs
You can configure an analogue output with a function for an engine operating value. The controller receives this value from an
engine measurement. The controller then adjusts the analogue output to reflect the engine operating value.
Assign the function to an analogue output under
Configure > Input/output
. Select a hardware module with an analogue output,
then select the output to configure.
Table 8.20
Engine operating value outputs
Function
I/O
Units
Details
Engine > Power derate >
Derate # temperature [C],
where # is 1 to 3
Analogue
output
-50 to 200 °C
The controller outputs the derate temperature. For this function
to work, there must be an analogue input to the controller with
the engine derate temperature.
Engine > Running detection >
Oil [bar]
Analogue
output
0 to 10 bar
The controller outputs the engine oil pressure. For this function
to work, there must be an analogue input to the controller with
the engine oil pressure.
Engine > Running detection >
MPU [RPM]
Analogue
output
0 to 20,000
RPM
The controller outputs the engine speed. For this function to
work, there must be an active MPU/W/NPN/PNP input to the
controller with the engine speed.
Engine > Cooldown > Coolant
water [C]
Analogue
output
-50 to 200 °C
The controller outputs the engine coolant water temperature. For
this function to work, there must be an analogue input to the
controller with the engine coolant water temperature.
Applications
An analogue output with an engine operating value may be wired to a switchboard instrument, to help the operator with
troubleshooting. For example, the engine speed measured by the MPU (
Engine > Running detection > MPU [RPM]
) can be
displayed.
8.6.5 Engine states as digital outputs
You can configure a digital output with a function for an engine state. The controller activates the digital output if the engine state is
present. These can be useful for troubleshooting.
Outputs
Assign the function to a digital output under
Configure > Input/output
. Select a hardware module with a digital output, then select
the output to configure.
DESIGNER'S HANDBOOK 4189340911K UK
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