ABB PVS300 Product Manual page 103

Fault Fault message
message description
ID code
16 Ground Current
17 Ground
impedance
18 RCD Sensor
21 Current
measurement
Causes of fault and corrective actions
The inverter's RCMU has diagnosed leakage current to ground
during the inverter's power feeding operation and has
disconnected itself from the electrical grid. Leakage current can be
the result of human, animal or another object's contact between
(faulty) cabling or electrical device and ground. Leakage current
can also be caused by water ingress or high humidity at the PV
modules or junction boxes creating current path to ground.
Power down the inverter.
Check that no people, animals or other objects are in danger or in
contact with electrical parts of your PV system.
Check visually that there are no faults or burn marks around the
cabling of your PV system.
If the system looks normal then try to restart the inverter.
If the inverter returns to 'Ground fault state', immediately isolate
the inverter from all power sources.
Request a service visit from your system supplier. Your PV system
might have a dangerous AC or DC side isolation fault and contact
to ground.
The inverter has diagnosed too low impedance (isolation fault)
between the DC+ or DC - bus of the inverter and ground before
establishing grid connection.
Low impedance can be the result of faulty DC cabling between
device and ground. Low impedance can also be caused by water
ingress or high humidity at PV modules or junction boxes creating
a current path to ground.
Power down the inverter.
Check visually that there are no faults or burn marks around the
cabling of your PV system.
If the system looks normal then try to restart the inverter.
If the inverter returns to 'Ground fault state', immediately isolate
the inverter from all power sources.
Request a service visit from your system supplier. Your PV system
might have a dangerous DC side isolation fault and contact to
ground.
Fault detected in the residual current monitoring unit.
Power down the inverter.
Restart the inverter.
If the inverter returns to 'RCD Sensor', immediately isolate the
inverter from all power sources and contact your system supplier.
The inverter has diagnosed an error in current measurement.
Try to reset the fault and monitor if the inverter returns to normal
operation or not.
If the inverter does not return to normal operation, power down the
inverter and contact your system supplier.
Troubleshooting 103