Delta RPI M50A_120

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