9

Undervoltage

Vacon · NX All-in-One Application

What does 9 mean?

The DC-link voltage is lower than its operational limits during run, specifically subcode S1 indicates the DC-link is too low. This condition can be caused by an insufficient supply voltage, an internal AC drive fault, a defective input fuse, or an external charge switch that is not closed. Subcodes S2 (No data from power unit) and S3 (Undervoltage control supervision) also relate to general undervoltage conditions.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Inspect all input fuses for continuity using a multimeter and ensure their current rating is appropriate for the drive.

  2. 4

    Verify the external charge switch, if present, is correctly closed and its contacts are making good connection.

Source: Vacon NX All-in-One Application
Open Manual (Page 373)