112 Troubleshooting
Fault messages
If there is an active fault message
Use the “reset” button on the control unit or start the inverter again.
Examine the inverter for a few minutes to see whether it returns to normal operation.
• If the inverter appears to operate normally, monitor the operation closely for a few
days.
• If a fault cannot be reset or if it occurs frequently, record the event date and time,
and inverter serial number, and contact your system supplier.
Faults
Code Fault Cause What to do
11776 AC overcurrent - AC-side short-circuit
- Sudden AC-side voltage drop
If the AC-side circuit breaker on the electrical
distribution board is tripped, an electrician
must examine your electrical system. Report
the behaviour to your system supplier.
If the AC-side circuit breaker is not tripped,
reset the fault from the control unit:
1. Power down the inverter: Set the DC switch
and the AC-side circuit breakers to the OFF
position.
2. Wait until the DC bus voltage drops below
300 V
DC
and the control unit switches OFF.
3. Restart the inverter: Set the DC switch and
the AC circuit breakers to the ON position.
4. Monitor the inverter for a few minutes to
see if it returns to normal operation.
5. Monitor the inverter carefully for a few
days.
If the fault occurs frequently, record the event
date and time, and inverter serial number, and
contact your system supplier.
15873 FRT grid fault A grid voltage disturbance
exceeded the FRT trip curve
Restart the inverter and monitor that it
connects to the grid.
15876 DC overvoltage - DC voltage of over 1,100 V
DC
- The system may have too
many PV modules in series
Read and record the DC voltage from the
“Technical info 1” page on the control unit.
If the DC voltage is more than 1,100 V
DC
, set
the DC switch and external DC switches to
the OFF position. The DC voltage on the
“Technical info 1” page should decrease.
If the DC voltage does not decrease (-SX
model), disconnect all of the PV quick
connectors.
If the fault is active but the DC voltage is less
than 1,100 V
DC
, reset the fault and monitor
that the inverter returns to normal operation.
If the inverter returns to normal operation,
monitor the inverter for a few days.
Record the event date and time, and contact
your system supplier.
24068 PU logic error Internal fault Restart the inverter. If the same fault occurs
again, power down the inverter and contact
your system supplier.
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