Parameter
Range
Default
Notes
If the controller needs to increase the governor output, the GOV
increase digital output is activated for at least the Minimum ON
time. While the controller is increasing the governor output, the
GOV decrease digital output is not activated.
If the controller needs to decrease the governor output, the GOV
decrease digital output is activated for at least the Minimum ON
time. While the controller is decreasing the governor output, the
GOV increase digital output is not activated.
Maximum ON time
0 to 100 %
100 %
You can decrease the Maximum ON time to force a fast system
to respond less to the controller's regulation.
If the controller needs to increase the governor output, the GOV
increase digital output is activated for no longer than the
Maximum ON time. While the controller is increasing the
governor output, the GOV decrease digital output is not
activated.
If the controller needs to decrease the governor output, the GOV
decrease digital output is activated for no longer than the
Maximum ON time. While the controller is decreasing the
governor output, the GOV increase digital output is not
activated.
6.6 Automatic voltage regulator
6.6.1 AVR regulator
An AVR is used to control the excitation of the genset. When the current to the exciter is increased, the magnetic field of the exciter
also increases. During voltage regulation, this increases the voltage output from the genset. Similarly, by decreasing the current to
the exciter, the voltage output from the genset is decreased. Reactive power is adjusted to increase or decrease voltage.
The AVR must allow external adjustment (digital inputs or analogue input), to let the genset controller bias the AVR internal set point.
The sections below describe the common input parameters for the automatic voltage regulator (AVR).
Parameters
The AVR general configuration settings apply to all the controller's AVR regulation outputs (for example, relay or analogue). You can
configure the AVR common settings under
Configure > Parameters > Regulators > AVR general configuration
.
INFO
To see these parameters, you must configure an AVR output function.
Regulator output
If an AVR analogue regulation output and both AVR relay regulation outputs are configured, then one output must be selected as the
output that sends feedback to the AVR.
Parameter
Range
Default
Notes
Regulator
output
•
Off
•
Relay
•
Analogue
Analogue
Off:
The controller does not attempt to regulate the AVR, and ignores any configured
hardware.
Relay:
The controller uses the relay outputs to regulate the AVR (only visible if both
relays for the AVR regulator are configured).
DESIGNER'S HANDBOOK 4189340911K UK
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