SMA Sunny Island 2012 Technical Description page 132

Connecting External Sources
The following illustration shows the wiring for a generator that cannot be started remotely:
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Island Grid
The generator must always be switched off manually too. The Sunny Island automatically switches
to operation without generator.
GnReq Signal
The GnReq signal (see 14 "Relay" (Page 152)) is set to signal the generatordeployment
request and can therefore be used as an notification contact. If the generator is no longer
required the signal is deactivated.
In case this request occurs when the generator is running the signal is suppressed until the
generator has externally been stopped and the stop time has expired (30 seconds).
Disconnecting the generator
A disconnector should be positioned between the Sunny Island and the generator. If the
generator is to be stopped, it is first manually disconnected using the disconnector and
then it is stopped. This prevents the actuation of the generator when switching off.
Automatic start
So-called autostart generators can be integrated in this manner. These have an internal controller
for the start procedure.
The Sunny Island requests the generator via the GnReq signal. If the generator voltage and
frequency are within the set limits (see 13.1.6 "Limits and Power Adjustment" (Page 141)), the
device is synchronized and switched on after the warm-up time.
The Sunny Island keeps the request signal active until a disconnection is made and the set power-
down time has expired.
132 SI2012_2224-TEN082311
Sunny Island
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SMA Solar Technology AG
Generator
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Technical Description