9 Error events and troubleshooting
Error
Installation and Operation Manual for Solar Power Inverter M70A EU V2.0 EN 2020-08-03
108
9.1 Error
Error num-
ber
Message
Possible causes
Suggestions for resolution
E01
AC Freq High
Grid frequency lies above the
OFR
setting
(overfrequency detection).
Check the grid frequency.
Incorrect country or grid type setting.
Check the country and grid type settings.
E02
AC Freq Low
Grid frequency lies below the
UFR
setting
(underfrequency detection).
Check the grid frequency.
Incorrect country or grid type setting.
Check the country and grid type settings.
E07
Grid Quality
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
HW Connect Fail
AC cable is not connected correctly.
Check the AC cable connection.
E09
No Grid
There is normally an external load-break switch
between the inverter and the grid (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-break switch is
closed.
AC cable is not connected correctly.
Check the AC cable connection.
E10, E15,
E20
AC Volt Low
Grid voltage lies below the
UVR
setting (under-
voltage 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
AC Volt High
Grid voltage lies above the
OVR
setting (over-
voltage detection).
Check the grid voltage.
Supply voltage during operation is greater than
the
OVR Langs.
setting.
Check the grid voltage.
Incorrect country or grid type setting.
Check the country and grid type settings.
E30
Solar High
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
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 nec-
essary.
