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bartonericAug 25, 2025
What to do if ABB PRO-33.0-TL Inverter displays DC overvoltage?
- Ddavid02Aug 25, 2025
If the inverter shows a DC overvoltage fault, 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 VDC, 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 VDC, 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. This can be caused by a DC voltage of over 1,100 VDC or the system having too many PV modules in series.
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