If island operation is selected, the digital input "MB closed" must NOT be activated with a 12/24 volt input signal. A "mains breaker
failure" will occur if the wiring of the mains breaker feedback inputs is wrong.
INFO
Refer to our application notes or installation instructions for information about the required breaker wiring.
INFO
We recommend not using small relays for stop coil output. If small relays are used, a resistor must be mounted across the
relay coil to prevent undesirable closing of the relay. This is caused by the wirebreak function.
2.9.1 Start sequence
The following drawings illustrate the start sequences of the genset with normal start prepare and extended start prepare.
No matter the choice of start prepare function, the running coil is activated 1 sec. before the start relay (starter).
Start sequence: Normal start prepare
Start prepare
Crank (Starter)
Run coil
Stop coil
Running feedback
1st start attempt 2nd start attempt 3rd start attempt
1 sec.
t
OFF
t
OFF
DESIGNER'S HANDBOOK 4189341275A EN Page 52 of 196
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