Delta RPI-M8 User Manual page 60

1. Large Grid harmonics
2. Switching device is defective
HW AC OCR
3. Detection circuit malfunction
The detection circuit for
HW ZC Fail
synchronal signal malfunction
1. Switching device in boost is
defective
DC Current
2. Driver for boost is defective
High
3. Input current 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
Check the detection circuit for synchronal signal
inside the inverter
1. Check all switching device in boost
2. Check the driver curcuit for boost inside the
inverter
3. Check input current detection circuit
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