Delta RPI-M8 User Manual page 59

1. One or more relays are
sticking
Relay Test
2. The driver circuit for the relay
Short
malfunction
1. One or more relays are
abnormal
2. The driver circuit for the relay
Relay Test
malfunction
Open
3. The detection accuracy is not
correct for Vgrid and Vout
1. Not totally independent or
parallel between inputs
2. PV Array short to Ground
Bus
3. Driver for boost is defective or
Unbalance
disconnected
4. Detection circuit malfunction
1. Driver for boost is defective
2. Voc of PV array is over
HW Bus
1000Vdc
OVR
3. Surge occurs during operation
4. Detection circuit malfunction
1. Surge occurs during operation
2. Driver for inverter stage is
AC Current
defective
High
3. Switching device is defective
4. Detection circuit malfunction
1. Test current loop is broken
HW CT A
2. CSC1 is defective
Fail
3. Detection circuit malfunction
1. Test current loop is broken
HW CT B
2. CSC2 is defective
Fail
3. Detection circuit malfunction
1. Test current loop is broken
HW CT C
2. CSC3 is defective
Fail
3. Detection circuit malfunction
1. Replace the defective relay(s)
2. Check the driver circuit inside the inverter
1. Replace the defective relay(s)
2. Check the driver circuit inside the inverter
3. Check the Vgrid and Vout voltage detection
accuracy
1. Check the inputs connections
2. Check the PV Array insulation
3. Check the driver circuit for boost inside the
inverter
4. Check the detection circuit inside the inverter
1. Check the driver circuit for boost inside the
inverter
2. Modify the solar array setting, and make the
Voc less than 1000Vdc
3. N/A
4. Check the detection circuit inside the inverter
1. N/A
2. Check the driver circuit in inverter stage
3. Check all switching devices in inverter stage
4. Check the detect circuit inside the inverter
1. Check the connection of WC3 to CNC16
2. Replay CSC1 with new one
3. Check the detection circuit inside the inverter
1. Check the connection of WC3 to CNC16
2. Replace CSC2 with new one
3. Check the detection circuit inside the inverter
1. Check the connection of WC3 to CNC16
2. Replace CSC3 with new one
3. Check the detection circuit inside the inverter
58