Sungrow SG250K3, Operation Manual

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8.2. Touch Screen Displayed Fault Troubleshooting
If a fault occurs, the SG250K3 will generate a message and display the
message in the “state:” position.
Table 8-3
Displayed Fault description and troubleshooting
Fault name description troubleshooting
Vdc-high
Over voltage on DC
input (>880V)
Disconnect the DC input of the SG250K3.
Otherwise the inverter could be severely
damaged! Check the configuration of your system
and measure the DC voltage before reconnecting
the inverter to the DC source.
Vac-high The grid voltage has
exceeded the permissible
range.
Check the grid voltage and grid connections
of SG250K3. If the grid voltage lies outside the
range because of local conditions, ask the
electricity provider if the voltage can be adjusted at
the feed-in point or if they agree to changes in the
values of the monitored operational limits.
If the grid voltage lies within an acceptable range
and “ Vac-high “ or “ Vac-low “ faults are still
being displayed, please contact the Sungrow.
Vac-low
F-fault
The grid frequency has
exceeded the permissible
range.
Check the grid frequency and grid
connections of SG250K3. If the grid frequency lies
outside the acceptable range because of local
conditions, ask the electricity provider if the
voltage can be adjusted at the feed-in point or if
they agree to changes in the values of the
monitored operational limits.
If the grid frequency lies within an
acceptable range and “ F-fault “ is still being
displayed, please contact the Sungrow.
IPM-flt Internal power
conversion IPM fault
The reason is complicated, may be due to
EMI or IPM damage or over voltage etc.
Measure the temperature of the heatsink, if
over 80°C
，
wait for the inverter to recover.
Please restart the inverter, If this fault
frequently happens, contact Sungrow.
Island No grid is detected by
the SG250K3
Check whether the breaker in the grid side is
switched on, if not, switches on the breaker.
Check whether the inverter connection wiring
is OK, if not, re-connect the wires.
Check whether the grid is available, if