Parameter
Modbus
address
Modbus
function
codes
Valid
Modbus
range
Scaling
(10
-x
)
Unit Comment
The value is a percentage of the controller
nominal reactive power.
Regulators > AVR
> Cos phi set
point
8012
03; 06; 16
60 to 100
2
-
If the operator activates
Activate external Cos phi
set point
, the cos phi set point is determined by
the value set in Modbus.
More information
See
Holding register (03; 06; 16)
in the
Modbus tables
for more information about the Modbus functions and their
properties.
6.5 Governor
6.5.1 Governor regulation function
A governor is external equipment used to control the engine speed for the genset. During frequency regulation, when the speed
drops below the required speed, the governor increases the fuel supply to the engine which increases the engine speed. Similarly,
by decreasing the fuel supply, the engine speed also decreases. The frequency of the genset is directly related to engine speed and
the number of poles in the generator.
The governor must allow external adjustment (digital inputs or analogue input), to let the genset controller bias the governor internal
set point.
The sections below describe the input and output setup and common input parameters for the governor regulation function.
Inputs and outputs
Function
I/O
Type
Details
Regulators > GOV >
Command > Activate ramp
1
Digital
input
Pulse
The operator activates this input to use curve 1 during power ramp up and
power ramp down.
If ramp 2 was selected as the active ramping method when you activate ramp 1,
the ramping method is immediately changed to ramp 1.
Regulators > GOV >
Command > Activate ramp
2
Digital
input
Pulse
The operator activates this input to use curve 2 during power ramp up and
power ramp down.
If ramp 1 was selected as the active ramping method when you activate ramp 2,
the ramping method is immediately changed to ramp 2.
Parameters
The governor general configuration settings apply to all the controller's governor regulation outputs (for example, relay, analogue,
pulse width modulation, and so on). You can configure the governor general configuration settings under
Configure > Parameters >
Regulators > GOV general configuration
.
INFO
To see these parameters, you must assign a governor output function.
Regulator output
If a governor analogue regulation output and both governor relay regulation outputs are configured, then one output must be
selected as the output that sends feedback to the governor.
DESIGNER'S HANDBOOK 4189340911K UK
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