Inrush fault

What does 33 mean?

Too many power-ups have occurred within a short time period, leading to excessive inrush current events. This frequent power cycling prevents the unit from dissipating heat and can stress internal components, potentially shortening the drive's lifespan.

• Excessive number of power cycles within a short time period (e.g., >5 cycles per minute), stressing internal components.
• Faulty pre-charge circuit components (e.g., inrush current limiting resistors, bypass contactor) on the power card.
• Main input contactor chattering or failing to close cleanly, causing multiple inrush events.
• Brief power outages or "flicker" on the mains supply line causing rapid power cycling.

Click steps to track your progress.

1. 1

   1. Monitor the mains supply voltage for stability and absence of rapid on/off cycles for at least 5 minutes.

2. 2

   2. Inspect the drive's internal pre-charge circuit (resistors and bypass contactor) for physical damage or wear.

3. 3

   3. Verify the operation of the external main input contactor; check coil voltage and contact integrity.

4. 4

   4. Ensure the drive remains powered down for a minimum of 10 minutes between consecutive power cycles to allow capacitor discharge.