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