SMA SMC 4600A Installation - Manual (Page 43)

SMA Solar Technology AG Electrical Connection
Installation Manual SMC46-60A11-IA-en-81 43
5.7.2 Setting the Stand-Alone Grid Operation
To operate the inverter in an off-grid system with Sunny Island, you must set the "Default" parameter
to stand-alone grid ("OFF-Grid") operation.
There are several ways of setting the inverter to stand-alone grid operation:
• Setting via Sunny WebBox
or
• Setting via Sunny Data Control or Sunny Explorer
5.7.3 Additional Country Parameters
The deactivation criteria (voltage, frequency, impedance) are specified via country parameters as
with all Sunny Mini Central inverters.
The additional default country parameter "MVtgDirective" expands the deactivation limits of the
inverter for voltage and frequency to a maximum/minimum. This country setting may only be selected
if the PV plant or the inverter is operated with external three-phase decoupling protection, which will
automatically disconnect the inverter from the electricity grid if non-permissible voltage and frequency
values occur. Device protection is still guaranteed.
DANGER!
Danger to life due to high voltages in the event of electricity grid failure
If you set the inverter to stand-alone grid operation, it does not fulfil any country-specific
standards or guidelines. If there is an electricity grid outage, there will consequently be a
danger of backfeed.
• Never operate the inverter directly on the electricity grid when set to stand-alone
grid operation.
Requirement for the setting
Set the installation country as described in Section 5.7.1 "Setting the Installation Country"
(page 42) before setting the country parameter described here.
DANGER!
Danger to life due to electric shock if external decoupling protection is missing
With the country setting "MVtgDirective", the inverter may only be operated with an
external three-phase decoupling protection device which complies with the country-specific
requirements.
Without such external decoupling protection, the inverter will not disconnect from the
electricity grid when the standard requirement is exceeded.
• Install external three-phase decoupling protection.