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10. Error messages and trouble shooting
Message
HW Efficiency
HW NTC1 Fail
HW NTC2 Fail
HW NTC3 Fail
HW NTC4 Fail
HW Red ADC1
HW Red ADC2
HW ZC Fail
RCMU Fail
Relay Test Open
Relay Test Short
Temperature High
Temperature Low
94
Possible cause
●
The calibration is incorrect.
●
Current feedback circuit is defective.
●
Ambient temperature > 90 °C or < -30
°C.
●
Detection circuit malfunction.
●
Insufficient input power.
●
Auxiliary power circuitry malfunction.
●
Detection circuit malfunction.
●
The detection circuit for synchronal
signal malfunction.
●
RCMU is disconnected.
●
Detection circuit malfunction.
●
One or more relays are abnormal.
●
The driver circuit for the relay mal-
function.
●
The detection accuracy is not correct
for V
and V
.
grid
out
●
One or more relays are sticking.
●
The driver circuit for the relay mal-
function.
●
The ambient is > 60 °C (the installa-
tion is abnormal).
●
Detection circuit malfunction.
●
Ambient temperature is < -30 °C.
●
Detection circuit malfunction.
Solution
●
Check the accuracy of current and
power.
●
Check the current feedback circuit
inside solar inverter.
●
Check the installation ambient and
environment.
●
Check the detection circuit inside
solar inverter.
●
Check the input voltage, must >
150 V
.
DC
●
Check the auxiliary circuitry inside the
solar inverter.
●
Check the detection circuit inside the
solar inverter.
●
Check the detection circuit for syn-
chronal signal inside the solar in-
verter.
●
Check the RCMU connection inside
solar inverter.
●
Check the detection circuit inside
solar inverter.
●
Replace the defective relay(s).
●
Check the driver circuit inside solar
inverter.
●
Check the V
and V
grid
tection accuracy.
●
Replace the defective relay(s).
●
Check the driver circuit inside solar
inverter.
●
Check the installation ambient and
environment.
●
Check the detection circuit inside
solar inverter.
●
Check the installation ambient and
environment.
●
Check the detection circuit inside
solar inverter.
Installation and Operation Manual for RPI M50A
voltage de-
out
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