SMA SI 5048, Technical Description

Page: 104 / 212

Connecting External Sources SMA Solar Technology AG
104 SI5048-TEN093630 Technical Description
Manual (Manual Generator Start)
This setting is for generators that do not have an electrical remote starting option and, for example,
are started using cable winches or cranks, among other things.
In this case, the Sunny Island does not have the option of starting the generator. It only monitors the
generator input (AC2). If, while monitoring the input, the device detects that 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 following figure shows the wiring for a generator that cannot be started remotely:
The generator is also always switched off manually. The Sunny Island then automatically switches to
operation without generator.
GenReq Signal
The GnReq signal (see 15 ”Relays” (page 123)) 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 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. Actuation of the generator by the Sunny Island when switching off is thus
prevented.