SMA Sunny Island 5048 Installation Instructions Manual page 96

Connecting External Sources
The following figure principally displays the operation of a generator that has no
remote starting options:
Inselnetz
The generator is also always switched off manually. The Sunny Island 5048 then
automatically switches into the operating mode without the generator.
The GnReq signal (see 15 "Relay" (Page 115)) is set for signaling the generator
request and can thus be used as an alarm contact. If no request is pending, the
signal is disabled again.
If an internal request is sent while the generator is already running, the signal is
disabled until the generator is externally stopped and the stop time has expired.
A disconnector should be located between the Sunny Island 5048 and the
generator. If the generator is to be stopped, the generator is first manually
disconnected using the disconnector and then it is stopped. This prevents powering
the generator while switching it off.
Autostart
This allows autostart generators to be directly integrated. Autostart generators have a
separate internal controller that controls the start procedure.
The Sunny Island 5048 requests the generator using the GnReq signal. If the generator
voltage and frequency are within the set limits (see 14.1.5 "Limits and Power
Adjustment" (Page 105)), the device is synchronized and switched on following the
warm up time.
The Sunny Island 5048 keeps the request signal stable until a disconnection is made
and the set power down time has expired.
Autostart generators can also have an internal power down cycle that is only
activated when the request has been disabled. This can extend the power down
time accordingly.
Page 96 SI5048-11:EE4206
Sunny Island
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Technical Description