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Installation and Operating Manual for RPI M15A M20A Solar Inverter V1.0 2016-03-18
11 Error messages and troubleshooting
11.3 Malfunctions
Number
Message
Possible cause of error
Suggestions for troubleshooting
F36, F37,
F38, F39,
F40, F41
AC Current High
Overvoltage during operation.
Consult Delta customer service.
Internal fault.
Consult Delta customer service.
F30
Bus Unbalance
Not completely independent or parallel between
inputs.
Check the input connections.
Ground leak in the PV installation.
Check the insulation of the PV installation.
Internal fault.
Consult Delta customer service.
F60, F61,
F70, F71
DC Current High
Internal fault.
Consult Delta customer service.
F24
Ground Current
Insulation fault in the PV installation.
Check the insulation of the DC inputs.
Large PV installation capacitance between Plus
and ground or Minus and ground.
Check the capacitance; it must be < 2.5 µF. If
needed, install an external transformer.
Internal fault.
Consult Delta customer service.
F45
HW AC OCR
Large grid harmonics.
Check grid waveform. The grid connection of
the inverter must be far removed from non-
linear loads, if required.
Internal fault.
Consult Delta customer service.
F31, F33,
F35
HW Bus OVR
DC input voltage is above the maximum permis-
sible DC input voltage.
Change the solar installation setting so that the
DC input voltage at DC1 is below the maximum
permissible DC input voltage.
Overvoltage during operation.
Consult Delta customer service.
Internal fault.
Consult Delta customer service.
F23
HW COMM1
Internal fault.
Consult Delta customer service.
F22
HW COMM2
Internal fault.
Consult Delta customer service.
F26
HW Connect Fail
Internal fault.
Consult Delta customer service.
F42
HW CT A Fail
Internal fault.
Consult Delta customer service.
F43
HW CT B Fail
Internal fault.
Consult Delta customer service.
F44
HW CT C Fail
Internal fault.
Consult Delta customer service.
F01, F02,
F03
HW DC Injection
The grid waveform is not normal.
Check grid waveform. The grid connection of
the inverter must be far removed from non-
linear loads, if required.
Internal fault.
Consult Delta customer service.
F15,
F16,
F17
HW DSP ADC1
,
HW DSP ADC2
,
HW DSP ADC3
DC input voltage is below the minimum required
DC voltage.
Check the DC input voltage on the inverter dis-
play.
The solar irradiation is possibly too low.
Internal fault.
Consult Delta customer service.
F20
HW Efficiency
Incorrect calibration.
Check the accuracy of the voltage and power.
Internal fault.
Consult Delta customer service.