2.5 Running modes
2.5.1 Semi-auto mode
The controller can be operated in semi-auto mode. Semi-auto means that the controller will not initiate any sequences automatically,
as is the case with the auto mode. It will only initiate sequences, if external signals are given.
An external signal may be given in three ways:
1. Push-buttons on the display are used
2. Digital inputs are used
3. Modbus command
INFO
The standard AGC is only equipped with a limited number of digital inputs, see Digital inputs in this document and the data
sheet for additional information about availability.
When the genset is running in semi-auto mode, the controller will control the speed governor, and the AVR if it is used.
The following sequences can be activated in semi-auto:
Command
Description Comment
Start
The start sequence is initiated and continues until the genset starts or the maximum
number of start attempts has been reached. The frequency (and voltage) will be
regulated to make the GB ready to close.
Stop
The genset will be stopped. After disappearance of the running signal, the stop
sequence will continue to be active in the ‘"extended stop time" period. The genset is
stopped with cooling down time.
The cooling down
time is cancelled if
the stop button is
activated twice.
Close GB
The controller will close the generator breaker if the mains breaker is open,
synchronise and close the generator breaker if the mains breaker is closed.
When AMF mode is
selected, the
controller will not
regulate after breaker
closure.
Open GB
The controller will ramp down and open the generator breaker at the breaker open
point if the mains breaker is closed. The controller will open the generator breaker
instantly if the mains breaker is open or the genset mode is island mode.
Close MB
The controller will close the mains breaker if the generator breaker is open,
synchronise and close the mains breaker if the generator breaker is closed.
Open MB The controller opens the mains breaker instantly.
Manual GOV UP
The regulator is deactivated and the governor output is activated as long as the GOV
input is ON.
Manual GOV
DOWN
The regulator is deactivated and the governor output is activated as long as the GOV
input is ON.
Manual AVR UP
The regulator is deactivated and the governor output is activated as long as the AVR
input is ON.
Manual AVR
DOWN
The regulator is deactivated and the governor output is activated as long as the AVR
input is ON.
2.5.2 Test mode
The test mode function is activated by selecting test with the MODE push-button on the display or by activating a digital input.
DESIGNER'S HANDBOOK 4189341275A EN Page 27 of 196
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