Replacing The Surge Arrester - SMA COMMERCIAL STORAGE SOLUTION 30 System Manual

SMA Solar Technology AG
14.3.56 Event F972
Event message:
• F972 Isolation Fault
Explanation:
DC cabling insulation fault: The differential current measured is too high.
Corrective measures:
• Disconnect the battery and inverter from voltage sources.
• Check the grounding connection on the battery cabinet.
• Check the grounding connection on the battery management system.
• Check the DC cabling.
• Contact the Service.
14.3.57 Event F973
Event message:
• F973 Isolation sensor Selftest Fault
Explanation:
The differential current sensor is faulty.
Corrective measures:
• Disconnect the battery and inverter from voltage sources.
• Contact the Service.
14.3.58 Event F974
Event message:
• F974 Isolation sensor Selftest Fault (Offset)
Explanation:
The differential current sensor is faulty.
Corrective measures:
• Disconnect the battery and inverter from voltage sources.
• Contact the Service.
14.4

Replacing the Surge Arrester

If the inverter displays event number 7801, an error is present in the surge arresters or the surge arresters have tripped.
If the surge arresters have tripped, replace the tripped surge arresters with new surge arresters.
System Manual
14 Troubleshooting
ESSX-20-SH-en-10 167