40 Installation and Operating Instructions V01
Fault
36
Ground Fault
The residual current exceeds the
permitted upper limit.
37
PV Overvoltage
The voltage of the strings exceeds the
permitted upper limit.
38
ISO Fault
The PV generator’s insulation resistance
to ground is below the permitted value, or
the electrical insulation inside the inverter
has failed.
40
Over Temp.
The internal temperature exceeds the
permitted value.
41
Vac differs
for M-S
A different value of grid voltage has been
detected by the master and slave MCU.
42
Fac differs for
M-S
A different value of grid frequency has
been detected by the master and slave
MCU.
43
Ground I differs
for M-S
A different value of residual current has
been detected by the master and slave
MCU.
44
DC Inj. differs
for M-S
A different value of DC injection has been
detected by the master and slave MCU.
46
High DC Bus
The voltage of DC Bus exceeds the
permitted upper limit.
The last 10 dated failure reports on the NS protection can be read from LCD. An
interruption in the supply voltage of ≤ 3s does not result in any loss of failure
reports (according to VDE-AR-N 4105).
ISO fault(error code 38) and Ground(error code 36) fault will trigger buzzer alarm.
And it only happens when the safety of AU AS 4777.2 occupies.
