Over-current during Deceleration

What does E02 mean?

This fault occurs when the inverter detects an overcurrent condition during the motor's deceleration phase. This typically happens when the motor is regenerating energy back into the drive too rapidly or encounters a sudden mechanical jam during slowing down, leading to an inverter trip.

• Deceleration time (Parameter P1-11) set too short for the connected load's inertia, causing excessive regenerative energy.
• Braking resistor (Parameter P2-01) not connected, incorrectly sized, or failed open, preventing energy dissipation.
• Braking transistor (internal or external) malfunction, failing to shunt regenerative current.
• Over-voltage trip setpoint (Parameter P7-03) too low, leading to premature overcurrent during regeneration.
• Rapid changes in load inertia during braking, overwhelming the drive's regenerative capacity.

Click steps to track your progress.

1. 1

   Increase Deceleration Time (Parameter P1-11) by 20-50% to reduce the rate of energy regeneration.

2. 2

   Verify the connection and resistance of the external braking resistor (terminals P1, PB) using a multimeter; compare to specified ohmic value.

3. 3

   Check the status of the internal braking transistor (if applicable) by monitoring DC bus voltage (display parameter d0-02) during deceleration.

4. 4

   Confirm that the motor-inverter system has sufficient dynamic braking capacity for the application, possibly requiring an external braking unit.

5. 5

   Adjust the Over-voltage suppression function (e.g. Parameter P7-03) to automatically extend deceleration time if needed.