Delta RPI M50A_120

10. Error messages and trouble shooting
Installation and Operation Manual for RPI M50A
92
Message Possible cause Solution
DC Current High ● Switching device in boost is defective. ● Check all switching device in boost.
● Driver for boost is defective. ● Check the driver curcuit for boost
inside the solar inverter.
● Input current detection circuit mal-
function.
● Check input current detection circuit.
Ground Current ● PV array insulation fault. ● Check the insulation of DC inputs.
● Large PV array capacitance between
Plus to Ground or Minus to Ground.
● Check the capacitance (+ <-> GND
& - <->GND), must < 2.5 µF. Install a
external transformer if necessary.
● Either side of boost driver or boost
choke malfunction.
● Check boost driver & boost choke.
● Detection circuit malfunction. ● Check the detection circuit inside
solar inverter.
HW AC OCR ● Large grid harmonics. ● Check the utility waveform. Grid con-
nection of inverter needs to be far
away from non-linear load if neces-
sary.
● Switching device is defective. ● Check all switching devices in inverter
stage.
● Detection circuit malfunction. ● Check the detection circuit inside the
solar inverter.
HW Bus OVR ● Driver for boost is defective. ● Check the driver circuit for boost
inside solar inverter.
● Voc of PV array is > 1000 V
DC
. ● Modify the solar array setting, and
make V
DC
less than 1000 V
DC
.
● Surge occurs during operation. ● Call Delta Support.
● Detection circuit malfunction. ● Check the detection circuit inside
solar inverter.
HW COMM1 ● DSP is idling. ● Check reset and crystal in DSP.
● The communication connection is
disconnected.
● Check the connection between DSP
and COMM.
● The communication circuit malfunc-
tion.
● Check the communication circuit.
HW COMM2 ● Red. CPU is idling. ● Check reset and crystal in Red. CPU.
● The communication connection is
disconnected.
● Check the connection between Red.
CPU and DSP.
HW Connect Fail ● Power line is disconnected inside
solar inverter.
● Check the power lines inside solar
inverter.
● Current feedback circuit is defective. ● Check the current feedback circuit
inside solar inverter.