SMA SI 5048, Technical Description

Page: 105 / 212

SMA Solar Technology AG Connecting External Sources
Technical Description SI5048-TEN093630 105
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 14.1.6 ”Limits and Power Adjustment” (page 113)), 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
power down 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 is continued to be supplied.
Power down
Autostart generators can have an internal power down cycle that is only activated when
the request has been disabled. This can extend the power down 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 to activation = 10 minutes for GenMan
or
• 2 x "234.12 GnWarmTm" + 2 minutes for manual and automatic start