Connecting External Sources SMA Solar Technology AG
110 SI5048-TB-TEN110340 Technical Description
Autostart
This allows autostart generators to be directly integrated. They have a separate internal controller that
controls 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 section 14.1.6”Limits and Power Adjustment” (page118)), the device is
synchronized and connected following the warm up time.
The Sunny Island keeps the request signal active until a disconnection is made and the set follow-up
time has expired.
The following figure shows the wiring for a generator capable of autostart:
If the generator is started manually in this operating mode, the Sunny Island detects the running
generator and connects it once the warm-up time has expired. If the generator is externally stopped,
this is detected, the generator is disconnected and the stand-alone grid system is continued to be
supplied.
After-run
Autostart generators can have an internal after-run cycle that is only activated when the
request has been disabled. This can extend the follow-up time accordingly.
Internal warm-up phase
With some generator types, the voltage is only switched to the output after the internal
warm-up phase is finished. Therefore, the time of the generator activation sequence is
monitored internally.
• Time for connection = 10 minutes for GenMan
or
• 2 x "234.12 GnWarmTm" + 2 minutes for manual and automatic start
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