If the genset load is 0 kW, and 50 kW is required from the genset, it takes at least 10 seconds to ramp up the genset load.
If the genset load is 0 kW, and 70 kW is required from the genset, it takes at least 12 seconds to ramp up the genset load.
Active power ramp down
This parameter defines the speed of the ramp down of the genset active power when the fixed power set point changes or when the
genset disconnects from the busbar. This reduces the mechanical strain on the genset and breaker when the breaker opens and the
genset stops supplying power to the system. Limiting the power ramp down speed also increases the system stability.
The parameter consists of two curves. Each curve can consist of 2 to 10 coordinates for the time and the percentage of the genset
nominal power.
Parameter Range
Default ramp 1 Default ramp 2 Notes
[s]
0 to 3600 s 0 s; 20 s
0 s; 1000 s
The time coordinate for the power ramp down curve.
[%]
0 to 100 % 100 %; 0 %
100 %; 0 %
The percentage of nominal power of the genset coordinate for the
power ramp down curve.
Power ramp down example
You want a 100 kW genset to ramp down to 50 % of its nominal power at 10 %/s, and 5%/s between 50 % and a 0 % of its
nominal power. This means that it will take at least 15 seconds to ramp down the genset load from 1000 kW to 0 kW.
The coordinates for the primary power ramp up curve are: (0 s; 100 %), (5 s; 50 %) and (15 s; 0 %).
This means that the controller regulates the genset to follow a slope of 10 kW/s between 100 % and 50 % of the genset's
nominal power. And the controller regulates the genset to follow a slope of 5 kW/s between 50 % and a 0 % of the genset's
nominal power.
If the genset load is 50 kW, and 0 kW is required from the genset, it takes at least 10 seconds to ramp down the genset
load.
If the genset load is 70 kW, and 0 kW is required from the genset, it takes at least 12 seconds to ramp down the genset
load.
6.5.2 Governor analogue regulation function
You can configure an analogue output on the controller to regulate the governor. You can also set a number of parameters for the
governor analogue regulation function.
DESIGNER'S HANDBOOK 4189340911K UK
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