ABB PVS300 Product Manual page 106

106 Troubleshooting
Fault Fault message
message description
ID code
31 MCU connection The inverter has diagnosed an internal communication error.
32 MCU UAC
33 MCU IGND
34 DC input wiring
36 SW internal
Causes of fault and corrective actions
Power down the inverter.
Restart the inverter.
If the inverter returns to the same fault state, power down the
inverter and contact your system supplier.
The inverter has diagnosed an internal measurements
redundancy fault.
Power down the inverter.
Restart the inverter.
If the inverter returns to the same fault state, power down the
inverter and contact your system supplier.
The inverter has diagnosed an internal measurements
redundancy fault.
Power down the inverter.
Restart the inverter.
If the inverter returns to the same fault state, power down the
inverter and contact your system supplier.
The inverter has diagnosed a reverse polarity or short circuit at DC
terminals.
From Events menu - > warnings, check if warning 1000 is also
active. If it is, check and replace all faulty string fuses.
Power down the inverter. Open the bottom cover and check that
all of the DC connectors are firmly in their correct positions in
accordance with the cable markings.
If no input connection errors are found, replace the bottom cover
and restart the inverter.
If cable markings are unclear or missing, or if the inverter returns
to the same fault state, power down the inverter and contact your
system supplier. Request a service visit to check the polarity and
order of DC input connectors, and to check the PV system
installation for short circuits and connection errors.
An illegal SW function was detected.
Try to reset the fault and monitor whether or not the inverter
returns to normal operation.
If the inverter does not return to normal operation, power down the
inverter and contact your system supplier.