Auto Rstrt Tries

What does F33 mean?

The drive has attempted to automatically reset a fault and restart the programmed number of times (set by A451) without success. This indicates a persistent underlying issue that the auto-restart feature cannot resolve, preventing the drive from resuming operation.

• A persistent underlying fault condition (e.g., overcurrent, undervoltage) is recurring, causing the drive to fault repeatedly.
• Parameter A451 (Auto Restart Tries) is set too low, preventing the drive from successfully clearing a transient fault.
• Intermittent activation of an external input (e.g., safety circuit, E-stop) leading to repeated fault conditions.
• Environmental instability (e.g., fluctuating input power, extreme temperatures) causing recurring, non-permanent faults.

Click steps to track your progress.

1. 1

   Access the drive's fault history log and identify the specific fault code that occurred immediately before F33.

2. 2

   Temporarily disable auto-restart (set A451 to 0) and monitor the drive for the recurring root fault to diagnose its origin.

3. 3

   Inspect external control wiring and devices connected to the drive's digital inputs for intermittent contact issues.

4. 4

   Monitor the drive's input supply voltage (e.g., at terminals R, S, T) for stability during operation, noting any sags or fluctuations.

5. 5

   Review parameter A451 (Auto Restart Tries) and consider increasing it if the underlying fault is confirmed to be transient and non-critical.