Current limit

What does 12 mean?

The output current has exceeded the value set in parameter 221 (Current Limit ILIM). The adjustable frequency drive will trip after a period defined by parameter 409 (Trip delay overcurrent). This indicates a sustained overload condition on the motor.

• Mechanical overload on the motor and driven equipment, causing the motor to demand current exceeding P2-21 (Current Limit).
• Rapid acceleration (P2-00) or deceleration (P2-01) of a high-inertia load, causing momentary current spikes.
• Incorrect motor parameters (P1-20 to P1-25) or motor tuning causing the drive to inaccurately estimate motor flux, leading to excessive current.
• Short circuit or ground fault in the motor windings or motor output cables, drawing high current.
• Drive is undersized for the application's peak current demands.

Click steps to track your progress.

1. 1

   1. Measure the actual motor current (A01-04) during operation and compare it to the current limit set in parameter P2-21.

2. 2

   2. Inspect the mechanical system (e.g., bearings, gears, conveyor belt) for any binding, obstruction, or increased resistance that would increase motor load.

3. 3

   3. Increase the acceleration time (P2-00) by 10-20% to reduce initial current surges during startup.

4. 4

   4. Verify all motor nameplate data (kW, V, A, Hz, RPM) is accurately entered into drive parameters P1-20 to P1-25.

5. 5

   5. Power off the drive and perform an insulation resistance test (megohmmeter) on the motor cables and motor windings to ground.

6. 6

   6. If the fault occurs at very low speeds, check V/Hz curve settings (P2-05 to P2-07) and consider increasing the starting boost voltage (P2-06).