102 Troubleshooting
Fault messages and their corrective actions
Fault
message
ID code
Fault message
description
Causes of fault and corrective actions
1 Overcurrent The inverter has performed an overcurrent trip and has
disconnected from the grid. Possible causes for an overcurrent
peak are an AC side short-circuit, sudden AC side disturbance or
inverter malfunction.
Check if the AC side circuit breaker for inverter output protection
at the electrical distribution board has also tripped. If it has, the
electrical system should be checked by an electrician. If it has not,
try to reset the fault and restart the inverter.
2 DC bus
overvoltage
The inverter has diagnosed high DC voltage. The inverter might
be damaged.
Check and record the DC voltage reading from the Technical
information page.
If the fault is active but the DC voltage reading is under 900 VDC,
try to reset the fault and restart the inverter.
If the DC voltage reading is over 900 V, turn the DC switch to ‘0’
position. The DC voltage shown in the Technical Information view
should start to decrease.
Always inform your system supplier about DC bus overvoltage
faults because excessive DC voltage levels can damage the
inverter.
4DC cap
overvoltage
The inverter has diagnosed excessive DC capacitor voltage
caused by imbalance between the upper and lower capacitors.
Check and record the DC voltage reading from the Technical
information page.
If the fault is active but the DC voltage reading is under 900 VDC,
try to reset the fault and restart the inverter.
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