48 Installation and Operating Instructions V03
The grid voltage is outside the permitted
range.
No Utility Grid
Available
The utility cannot be detected, which may
be caused by no utility, grid disconnected,
AC cables damaged, fuse broken or
stand-alone grid.
The residual current exceeds the
permitted upper limit.
The voltage of the strings exceeds the
permitted upper limit.
The PV array’s insulation resistance to
ground is below the permitted value, or
the electrical insulation inside the
inverter has failed.
The internal temperature exceeds the
permitted value.
A different value of grid voltage has
been detected by the master and slave
MCU.
A different value of grid frequency has
been detected by the master and slave
MCU.
Residual current
differs for M-S
A different value of residual current has
been detected by the master and slave
MCU.
A different value of DC feed-in has been
detected by the master and slave MCU.
A different value of grid frequency and
voltage has been detected by the master
and slave MCU.
A different value has been detected by
the master and slave MCU.