Delta RPI H3A Operation And Installation Manual page 46

Measurement, Error Message and Trouble Shooting
Message
F20: Efficiency
Inconsistent
F22: Internal
Comm Fault_R
F23: Internal
Comm Fault_D
F24: Residual
Curr Over Rating
F27: RCMU
Circuit Fail
F28: Relay Short
F29: Relay Open
F35: Bus Volt
Over Rating
Possible cause
1. The calibration is incorrect
2. Current feedback circuit is defective
1. Red. CPU is idling
2. The communication connection
is disconnected
1. DSP is idling
2. The communication connection
is disconnected
3. The communication circuit
malfunction
1. PV array insulation fault
2. Large PV array capacitance
between Plus to Ground or Minus
to Ground
3. Either side of boost driver or
boost choke malfunction
4. Detection circuit malfunction
1. RCMU is disconnected
2. Detection circuit malfunction
1. One or more relays are sticking
2. The driver circuit for the relay
malfunction
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. Driver for boost is defective
2. Voc of PV array is over550Vdc
3. Surge occurs during operation
4. Detection circuit malfunction
FAULT
1. Check the accuracy of current
and power
2. Check the current feedback circuit
inside the inverter
1. Check reset and crystal in
Red. CPU
2. Check the connection between
Red. CPU and DSP
1. Check reset and crystal in DSP
2. Check the connection between
DSP and COMM
3. Check the communication circuit
1. Check the insulation of Solar inputs
2. Check the capacitance
(+ <-> GND & - <-> GND),
must < 2.5uF. Install an external
transformer if necessary
3. Check boost driver & boost choke
4. Check the detection circuit inside
the inverter
1. Check the RCMU connection
inside the inverter
2. Check the detection circuit inside
the inverter
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 driver circuit for boost
inside the inverter
2. Modify the solar array setting,
and make the Voc less than 550Vdc
3. N/A
4. Check the detection circuit inside
the inverter
46
Action