Overcurrent

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The inverter's peak current limit has been exceeded, causing the frequency converter to trip into an alarm state after approximately 1.5 seconds of warning. This typically indicates a sudden increase in motor load, such as shock loading, a jam, or excessively fast acceleration of high-inertia loads. Persistent overcurrents can severely stress and damage the frequency converter's power components and the motor.

• Sudden mechanical jam, blockage, or excessive load applied to the driven equipment.
• Insufficient acceleration ramp time (e.g., P1-04 Acceleration Ramp 1) for the motor and load inertia.
• Motor winding insulation breakdown resulting in a phase-to-phase or phase-to-ground fault.
• Incorrect motor parameters (e.g., P1-20 Motor Current, P1-21 Motor Voltage) entered into the drive.
• Rapid change in load or speed without adequate drive response capability, leading to current spikes.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Inspect the driven machinery for mechanical binding, obstructions, or debris. Manually rotate the motor shaft (power off) to check for free movement.

2. 2

   Measure motor winding resistance (U-V, V-W, W-U) at the motor terminals to detect a phase-to-phase short circuit (expect balanced, low resistance).

3. 3

   Increase acceleration ramp time (e.g., P1-04) and deceleration ramp time (e.g., P1-05) by 20-50% to reduce current peaks during transients.

4. 4

   Verify drive parameters P1-20 (Motor Current), P1-21 (Motor Voltage), and P1-23 (Motor Frequency) match the motor nameplate data.

5. 5

   Monitor the output current (e.g., LCP display, parameter 16-14) during start-up or load application to pinpoint the exact peak current event.