1. Insufficient input power
2. Auxiliary power circuitry
malfunction
3. Detection circuit malfunction
1. Check the input voltage, must > 150Vdc
2. Check the auxiliary circuitry inside the inverter
3. Check the detection circuit inside the inverter
1. Insufficient input power
2. Auxiliary power circuitry
malfunction
3. Detection circuit malfunction
1. Check the input voltage, must > 150Vdc
2. Check the auxiliary circuitry inside the inverter
3. Check the detection circuit inside the inverter
1. Insufficient input power
2. Auxiliary power circuitry
malfunction
3. Detection circuit malfunction
1. Check the input voltage, must > 150Vdc
2. Check the auxiliary circuitry inside the inverter
3. Check the detection circuit inside the inverter
1. The calibration is incorrect
2. Current feedback circuit is
defective
1. Check the accuracy of current and power
2. Check the current feedback circuit inside the
inverter
1. Red. CPU is idling
2. The communication
connection is disconnected
1. Check reset and crystal in Red. CPU
2. Check the connection between Red. CPU and
DSp
1. DSP is idling
2. The communication
connection is disconnected
3. The communication circuit
malfunction
1. Check reset and crystal in DSP
2. Check the connection between DSP and
COMM
3. Check the communication circuit
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. Check the insulation of Solar inputs
2. Check the capacitance (+ <-> GND & - <->
GND), must < 2.5uF. Install a external
transformer if necessary
3. Check boost driver & boost choke
4. Check the detection circuit inside the inverter
1. Power line is disconnected
inside the inverter
2. Current feedback circuit is
defective
1. Check the power lines inside the inverter
2. Check the current feedback circuit inside the
inverter
1. RCMU is disconnected
2. Detection circuit malfunction
1. Check the RCMU connection inside the
inverter
2. Check the detection circuit inside the inverter
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