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11 Troubleshooting
SMA Solar Technology AG
Operating manualSTP3-6-3AV-40-BE-en-1268
Event number Message, cause and corrective measures
901
PE conn. missing > Check connection
The grounding conductor is not correctly connected.
Corrective measures:
Ensure that the grounding conductor is correctly connected.
3401 to 3407
DC overvoltage > Disconnect generator
Overvoltage at the DC input. This can destroy the inverter.
This message is signalized additionally by rapid flashing of the LEDs.
Corrective measures:
Immediately disconnect the inverter from all voltage sources (see
Section9, page62).
Check whether the DC voltage is below the maximum input voltage of
the inverter. If the DC voltage is below the maximum input voltage of the
inverter, reconnect the DC connectors to the inverter.
If the DC voltage exceeds the maximum input voltage of the inverter,
ensure that the PV array has been correctly rated or contact the installer
of the PV array.
If this message is repeated frequently, contact the Service (see
Section14, page96).
3501
Insulation failure > Check generator
The inverter has detected a ground fault in the PV array.
Corrective measures:
Check the PV system for ground faults (see Section11.3, page82).
3701
Resid.curr.too.high > Check generator
The inverter has detected a residual current due to temporary grounding of the
PV array.
Corrective measures:
Check the PV system for ground faults (see Section11.3, page82).
68


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