FAULT
Message Possible cause Action
HW CT B Fail
(F43)
1.
Test current loop is broken
2. CTP4 is defective
3.
Detection circuit malfunction
1.
Check the connection of CNP4 to CNM4
2. Replace CTP4 with new one
3. Check the detection circuit inside the
inverter
HW CT C Fail
(F44)
1. Test current loop is broken
2. CTP5 is defective
3.
Detection circuit malfunction
1.
Check the connection of CNP4 to CNM4
2. Replace CTP5 with new one
3. Check the detection circuit inside the
inverter
1. Large Grid harmonics
2.
Switching device is defective
3.
Detection circuit malfunction
1.
Check the utility waveform. Grid connection
of inverter need to be far away from
non-linear load if necessary
2. Check all switching devices in inverter
stage
3. Check the detection circuit inside the
inverter
The detection circuit for
synchronal signal malfunction
Check the detection circuit for synchronal
signal inside the inverter
HW AC OCR
(F45)
HW ZC Fail
(F50)
DC Cur. High
(F60, F61,
F70, F71)
1. Switching device in boost
is defective
2.
Driver for boost is defective
3. Input current detection
circuit malfunction
1. Check all switching device in boost
2.
Check the driver curcuit for boost inside
the inverter
3. Check input current detection circuit
Table 7-3 Fault Message
66
Error message and Trouble Shooting
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