9.1
Error
Error num-
ber
Description
Suggestions for resolution
E01
Mains frequency lies above the
OFR
setting (overfre-
quency detection).
Check the mains frequency.
Incorrect country or grid type setting.
Check the country and grid type settings.
E02
Mains frequency lies below the
UFR
setting (underfre-
quency detection).
Check the mains frequency.
Incorrect country or grid type setting.
Check the country and grid type settings.
E07
Non-linear load in the grid and in the vicinity of the inverter.
The grid connection of the inverter must be kept away from
non-linear loads; if necessary, move it further away.
If this error occurs repeatedly, contact Delta Customer
Service.
E08
AC cable is not connected correctly.
Check the AC cable connection.
E09
There is normally an external load isolating switch between
the inverter and the mains (e.g. in an equipment terminal
box). This is used to isolate the inverter from the mains
and to shut off its AC voltage supply.
Check that the external load isolating switch is closed.
AC cable is not connected correctly.
Check the AC cable connection.
E10, E15,
E20
Grid voltage lies below the
UVR
setting (undervoltage
detection).
Check the grid voltage connection at the inverter terminals.
Incorrect country or grid type setting.
Check the country and grid type settings.
AC cable is not connected correctly.
Check that the AC cable is connected correctly.
E11, E13,
E16, E18,
E21, E23
Mains voltage lies above the
OVR
setting (overvoltage
detection).
Check the mains voltage.
Supply voltage during operation is greater than the
OVR
Langs.
setting.
Check the mains voltage.
Incorrect country or grid type setting.
Check the country and grid type settings.
E30
The DC input voltage is too high.
Design the module strings so that the DC input voltage is
below the maximum permissible DC input voltage.
E34
Insulation fault in the PV system.
Check the insulation of the DC inputs.
Large PV system capacitance between Plus and Ground
or Minus and Ground or both.
Check the capacity. Dry the PV modules if necessary.
89
9 Error events and troubleshooting
Error
Installation and operation manual M70A_260 Flex RPI703M26000 EU V1.1 EN 2022-08-02
