Delta M80U User Manual

Table 6-3C: Fault Codes & Messages
Message Possible cause Action
HW Con. Fail
(F26)
1. Power line is disconnected
inside the inverter
2. Current feedback circuit is
defective
1. Check the power lines inside the inverter
2. Contact customer service for
technical support
RCMU Fail
(F27)
1. RCMU is disconnected
2. Detection circuit malfunction
1. Check the RCMU connection inside the
inverter
2. Contact customer service for
technical support
1. One or more relays are
sticking
2. The driver circuit for the
relay malfunction
3. Wrong connection in AC
terminal
1. Check the connection in AC terminal
2. Contact customer service for
technical support
1. One or more relays are
abnormal
2. The driver circuit for the
relay malfunction
3. The detection accuracy is
not correct for Vgrid and Vout
Contact customer service for technical
support
RLY Short
(F28)
RLY Open
(F29)
Bus Unbal.
(F30)
1. Not totally independent or
parallel between inputs
2. PV Array short to Ground
3. Driver for boost is defective
or disconnected
4. Detection circuit malfunction
1. Check the inputs connections
2. Check the PV Array insulation
3. Contact customer service for
technical support
HW Bus OVR
(F31, F33, F35)
1. Driver for boost is defective
2. Voc of PV array is over
1000Vdc
3. Surge occurs during
operation
4. Detection circuit malfunction
Contact customer service for technical
support
AC Cur. High
(F36, F37, F38,
F39, F40, F41)
1. Surge occurs during
operation
2. Driver for inverter stage is
defective
3. Switching device is defective
4. Detection circuit malfunction
Contact customer service for technical
support
Contact customer service for technical
support
HW CT A Fail
(F42)
1. Test current loop is broken
2. CTP3 is defective
3. Detection circuit malfunction
107
Error message and Trouble Shooting

Delta M80U Specifications

General

Brand	Delta
Model	M80U
Category	Inverter
Language	English