Mode Genset mode Breaker control
Manual All Push-button
Block All None
Before closing the breakers it must be checked that the voltage and frequency are OK. The limits are adjusted in menu 2110 Sync.
blackout.
Set points related to MB control
7080 MB control
Mode shift
When enabled, the AGC will perform the AMF sequence in case of a mains failure regardless of the actual
genset mode.
MB close delay The time from GB OFF to MB ON when back synchronisation is OFF.
Back sync. Enables synchronisation from mains to generator.
Sync. to mains Enables synchronisation from generator to mains.
Load time
After opening of the breaker, the MB ON sequence will not be initiated before this delay has expired. Please
refer to the description of "Breaker spring load time".
INFO
If no MB is represented, then the relays and inputs normally used for MB control become configurable. The power plant
constructor (USW) is used for configuration of the plant design if the application does not include an MB.
INFO
AGC without back synchronisation: The GB can only be closed if the mains breaker is open. The MB can only be closed if
the generator breaker is open.
INFO
AGC with back synchronisation: If the GB or MB push-button is activated, the AGC will start synchronising if the generator
or mains voltage is present. The GB can close directly if the MB is open. The MB can close directly if the GB is open.
AMF MB opening (menu 7065)
It is possible to select the functionality of the mains breaker opening function. This is necessary if the controller operates in
Automatic Mains Failure (AMF).
The possibilities in menu 7065 are:
Selection
Description
Start engine + open mains
breaker
When a mains failure occurs, the mains breaker opens, and the engine starts at the same time.
Start engine
When a mains failure occurs, the engine starts. When the generator is running and the frequency
and voltage are OK, the MB opens and the GB closes.
2.9.8 AMF timers and set points
The time charts describe the function at a mains failure and at mains return. Back synchronisation is deactivated. The timers used
by the AMF function are shown in the table below:
Timer
Description Menu number
t
FD
Mains failure delay
7071 f mains failure
7061 U mains failure
t
FU
Frequency/voltage OK 6220 Hz/V OK
DESIGNER'S HANDBOOK 4189341275A EN Page 61 of 196
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