11 Troubleshooting
SMA Solar Technology AG
Operating manual STP50-4x-BE-en-23 99
Event number Message, cause and corrective measures
901
Grounding connection missing > Check connection
The grounding conductor is not correctly connected.
Corrective measures:
• Ensure that the grounding conductor is correctly connected.
3401
3402
3404
3407
3410
3411
3412
DC overvoltage > Disconnect PV array
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.
• 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 Service.
3501
Insulation failure > Check generator
The inverter has detected a ground fault in the PV system.
Corrective measures:
• Check the PV system for ground faults.
3701
Residual current too high > Check PV array
The inverter has detected a residual current through brief grounding of the PV
array.
Corrective measures:
• Check the PV system for ground faults.
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