Delta RPI-M20A Manual

54
Relay Test
Short
1. One or more relays are
sticking
2. The driver circuit for the relay
malfunction
1. Replace the defective relay(s)
2. Check the driver circuit inside the inverter
Relay Test
Open
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
1. Replace the defective relay(s)
2. Check the driver circuit inside the inverter
3. Check the Vgrid and Vout voltage detection
accuracy
Bus
Unbalance
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. Check the driver circuit for boost inside the
inverter
4. Check the detection circuit inside the inverter
HW Bus
OVR
1. Driver for boost is defective
2. Voc of PV array is over
1000Vdc
3. Surge occurs during operation
4. Detection circuit malfunction
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
AC Current
High
1. Surge occurs during operation
2. Driver for inverter stage is
defective
3. Switching device is defective
4. Detection circuit malfunction
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
HW CT A
Fail
1. Test current loop is broken
2. CSC1 is defective
3. Detection circuit malfunction
1. Check the connection of WC3 to CNC16
2. Replay CSC1 with new one
3. Check the detection circuit inside the inverter
HW CT B
Fail
1. Test current loop is broken
2. CSC2 is defective
3. Detection circuit malfunction
1. Check the connection of WC3 to CNC16
2. Replace CSC2 with new one
3. Check the detection circuit inside the inverter
HW CT C
Fail
1. Test current loop is broken
2. CSC3 is defective
3. Detection circuit malfunction
1. Check the connection of WC3 to CNC16
2. Replace CSC3 with new one
3. Check the detection circuit inside the inverter

Delta RPI-M20A Specifications

General

Brand	Delta
Model	RPI-M20A
Category	Inverter
Language	English