Table 6-3C: Fault Codes & Messages - Delta M42U Operation And Installation Manual

Error message and Trouble Shooting
Message
1. Power line is disconnected
HW Con. Fail inside the inverter
(F26)
2. Current feedback circuit is
defective
RCMU Fail 1. RCMU is disconnected
(F27) 2. Detection circuit malfunction
1. One or more relays are
sticking
RLY Short
2. The driver circuit for the
relay malfunction
(F28)
3. Wrong connection in AC
terminal
1. One or more relays are
abnormal
2. The driver circuit for the
RLY Open
relay malfunction
(F29)
3. The detection accuracy is
not correct for Vgrid and Vout
1. Not totally independent or
parallel between inputs
Bus Unbal.
2. PV Array short to Ground
3. Driver for boost is defective
(F30)
or disconnected
4. Detection circuit malfunction
1. Driver for boost is defective
2. Voc of PV array is over
HW Bus OVR
1000Vdc
3. Surge occurs during
(F31, F33, F35)
operation
4. Detection circuit malfunction
1. Surge occurs during
operation
AC Cur. High
2. Driver for inverter stage is
(F36, F37, F38,
defective
F39, F40, F41)
3. Switching device is defective
4. Detection circuit malfunction
1. Test current loop is broken
HW CT A Fail
2. CTP3 is defective
(F42)
3. Detection circuit malfunction
Table 6-3C: Fault Codes & Messages
Possible cause
1. Check the power lines inside the inverter
2. Contact customer service for
technical support
1. Check the RCMU connection inside the
inverter
2. Contact customer service for
technical support
1. Check the connection in AC terminal
2. Contact customer service for
technical support
Contact customer service for technical
support
1. Check the inputs connections
2. Check the PV Array insulation
3. Contact customer service for
technical support
Contact customer service for technical
support
Contact customer service for technical
support
Contact customer service for technical
support
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Action