Overcurrent

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The motor cable current exceeds the hardware or software limits (>4*I H). This can be caused by a sudden heavy load increase, a short circuit in the motor cables, an incorrectly matched motor type, or improper parameter settings. If left unresolved, it can damage the motor or drive components.

• Sudden mechanical overload on the motor shaft exceeding motor nominal torque, potentially due to a jammed bearing or process obstruction.
• Short circuit between motor phases (U, V, W) or between a phase and ground within the motor cables.
• Motor current limit parameter (e.g., P5-10) set too low compared to the actual motor load requirements.
• Incorrect motor parameters (e.g., P3-01 to P3-08) entered into the drive, leading to improper motor control and excessive current draw.
• Drive internal power component (e.g., IGBT) failure causing uncontrolled current flow.

Klikk på steg for å spore fremgangen.

1. 1

   Measure motor phase currents (L1, L2, L3) using a clamp meter while attempting to start, noting peak values.

2. 2

   Isolate the motor by disconnecting output terminals (T1, T2, T3) and perform a motor insulation resistance test (Megger test) between phases and to ground.

3. 3

   Verify all motor parameters (P3-01 to P3-08) in the drive against the motor nameplate data (Voltage, Current, Frequency, RPM, kW/HP).

4. 4

   Inspect the mechanical load connected to the motor shaft for any binding, jamming, or excessive friction that could cause sudden torque demands.

5. 5

   Increase the acceleration time parameter (e.g., P2-01) to reduce inrush current during startup, if applicable.

6. 6

   Check the drive output terminals (T1, T2, T3) for any signs of shorting or loose connections, ensuring proper torque on terminal screws.