Danfoss VLT Alarm 9: Inverter overload

Danfoss Electrical Alarm/Warning Drive

Model: VLT 2800 / FC Series | Code: 9

Applicable Systems
FC-302 FC-301

Symptoms

Electronic thermal protection indicates inverter about to disconnect due to overload (output current too high, too long). Warning at 98%, trip at 100%. Meter must drop below 90% to reset.

Possible Causes

  • Inverter overload

Troubleshooting Steps

  1. Step 1: Reduce load; check motor and drive sizing; verify duty cycle.
    Fault resolved after action

How to Reset

Reset by: 1) Correct the fault condition. 2) Press RESET button or cycle power. 3) Verify fault does not recur.

Related Danfoss Fault Codes

Source: Danfoss VLT 2800 Manual (sinodrive.com)

Category: Electrical