SMA America, LLC
Connecting External Sources
Technical Description
SI5048U-TUS121440
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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 122)), 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 shut-off delay
time set has expired.
GenReq Signal
The GnReq signal (see section 15 ”Relays” (page 136)) is set for signaling the generator
request and can thus be used as an alarm contact (in this case: a bulb). If no request is
pending, the signal is reset.
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 (30 seconds).
Disconnecting the Generator
A disconnect should be positioned between the Sunny Island and the generator. If the
generator is to be stopped, it is first manually disconnected using the disconnect and then
it is stopped. This prevents actuation of the generator by the Sunny Island when switching
off.
Shut-off Delay
Autostart generators can have an internal shut-off delay that is only activated when the
request has been disabled. This can extend the shut-off delay 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.
• 2 x ”234.12 GnWarmTm” + 2 minutes for manual and automatic start
