Display Message Causes Solution
E026
Internal error
(Bad internal
reference voltage)
Wrong measurement of the
reference voltage inside the
equipment.
Internal error that cannot be checked externally. If the
problem persists (even after switching the inverter off
and then on again), contact ABB technical support.
E027
Internal error
(VGrid Measures
Fault)
Error in the internal
measurement of the grid voltage
(imposed by regulations) to have
a measurement redundancy
(2 measurements on the same
parameter carried out by two
different circuits).
This is an error inside the inverter that cannot be
checked externally. If the problem is persistent (even
after switching the inverter off and then on again),
contact ABB technical support.
E028
Internal error
(FGrid Measures
Fault)
Error in the internal
measurement of the grid
frequency (imposed by
regulations) to have a
measurement redundancy (two
measurements on the same
parameter carried out by two
different circuits).
This is an error inside the inverter that cannot be
checked externally. If the problem is persistent (even
after switching the inverter off and then on again),
contact ABB technical support.
E029
Mid-bulk OV
(Mid-bulk
overvoltage)
Error in the internal
measurement of the insulation
resistance of the PV array
compared to ground (imposed
by regulations) to have a
measurement redundancy (two
measurements on the same
parameter carried out by two
different circuits).
Error inside the inverter that cannot be checked
externally. The error occurs if the internal
measurement is carried out before connection to the
grid). If the problem is persistent (even after switching
the inverter off and then on again), contact ABB
technical support.
E030
Internal error
(ILeak Measures
Fault)
Error in the internal
measurement (carried out when
the inverter is connected to the
grid) of the leakage current of the
DC side (PV array) compared to
ground (imposed by regulations)
to have a measurement
redundancy (two measurements
on the same parameter carried
out by two different circuits).
This is an error inside the inverter that cannot be
checked externally. If the problem is persistent (even
after switching the inverter off and then on again),
contact ABB technical support.
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