Over-current (Other Conditions)

What does E04 mean?

This fault indicates an overcurrent condition that occurred under operating circumstances other than constant speed, acceleration, or deceleration. This general overcurrent trip mechanism acts as a catch-all for various abnormal current events, protecting the inverter from sustained high current levels.

• Instantaneous transient overcurrent due to sudden load changes or unexpected mechanical shock not related to accel/decel.
• Poor grounding or shielding of motor cables, leading to induced currents or noise affecting current sensors.
• Malfunction of the inverter's output power module (IGBTs) causing a momentary short circuit.
• Fluctuations in input power supply voltage or frequency causing unstable DC bus voltage and subsequent current spikes.
• Incorrect Parameter P1-02 (Motor type) or P1-03 (Motor rated current) setting, leading to an inaccurate internal motor model.

Click steps to track your progress.

1. 1

   Inspect the driven machine for sudden load impacts or mechanical events that could cause instantaneous current surges.

2. 2

   Verify proper shielding and grounding of motor cables to the inverter and motor frames according to manufacturer specifications.

3. 3

   Check for loose connections at inverter output terminals U, V, W and motor terminals.

4. 4

   Monitor input AC voltage at inverter terminals L1, L2, L3 using a multimeter for stability and correct phase sequence.

5. 5

   Perform a no-load run test with the motor decoupled to isolate the inverter/motor from mechanical load issues, monitoring current (d0-03).