INFO
All inputs or outputs used for manual control must be configured on the GAM3.2. The controller must not have any other
governor inputs or outputs.
When the controller is disabled, activate the
Stand-alone mode
digital input. The GAM3.2 then sends regulation signals based on
manual regulation inputs.
For analogue regulation, the GAM3.2 initially keeps the analogue output at a preset value. The GAM3.2 then adjusts the analogue
output in response to the manual inputs.
How it works when stand-alone mode is deactivated
If
Stand-alone mode
is deactivated, the controller determines the regulation mode and the regulation set point.
For analogue regulation, the GAM3.2 initially keeps the governor analogue output at its last value. Before taking over control from
GAM3.2, the controller adjusts the regulation set point for bumpless transfer.
6.3 AVR regulation modes
6.3.1 Overview
The genset regulation system consists of a number of basic control modes for the AVR. Each controller processes the input
information and calculates what action the genset should take to reach the required operating value. The calculated value is then
modified according to the AVR interface, and sent to the AVR.
INFO
To see the parameters mentioned in this section, you must have an AVR configured in the controller
Input/output
(relay
output or analogue output).
This section will give an overview of each AVR regulation mode, and the associated configuration.
6.3.2 Voltage regulation
The controller regulates and maintains the genset voltage at its nominal set point by sending a signal to the AVR to adjust the exciter
current.
Before the generator breaker is closed, the controller uses voltage regulation to match the genset voltage with the voltage of the
other gensets on the busbar. This minimises the circulating current in the system after gensets are connected to the busbar. The
controller calculates the necessary values to eliminate the circulating current between the generators before the busbar is connected
to a load. Then the controller uses the AVR output to send the adjusted values to the AVR. If a genset is already connected to a
load, the controller must match the generator voltages before closing an additional generator breaker.
Alternatively the voltage set point can be configured using Modbus.
More information
See
Regulation
,
External communication over Modbus
for more information about how the voltage set point is
configured using Modbus.
Analogue AVR output voltage parameters
The following table contains the parameters for an analogue AVR output that are used during voltage regulation.
The voltage regulation parameters define analogue regulation when the controller regulates AVR to change the voltage.
Configure these parameters under
Configure > Parameters > Regulators > AVR analogue configuration > Voltage regulation
.
DESIGNER'S HANDBOOK 4189340911K UK
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