oL1

The load is too large.

Decrease the load.

The acceleration/deceleration times or cycle times are too short.

• Examine the acceleration/deceleration times and the motor start/stop frequencies (cycle times).

• Increase the values set in C1-01 to C1-08 [Acceleration/Deceleration Times].

Overload occurred while running at low speed.

• Decrease the load when running at low speed.

• Increase the motor speed.

• If the motor is run frequently at low speeds, replace the motor with a larger motor or use a drive-dedicated motor.

  Note:

  For general-purpose motors, overload can occur while running at low speed when operating at below the rated current.

L1-01 [Motor Overload (oL1) Protection] is set incorrectly.

Set L1-01 in as specified by the motor qualities for a drive-dedicated motor.

The V/f pattern does not fit the motor qualities.

• Examine the ratios between the V/f pattern frequency and voltage. Decrease the voltage if it is too high compared to the frequency.

• Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2, adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid Point A Voltage] and E1-10 [Minimum Output Voltage].

  Note:

  If the values set in E1-08 and E1-10 are too low, the overload tolerance will decrease at low speeds.

E1-06 [Base Frequency] is set incorrectly.

Set E1-06 to the rated frequency shown on the motor nameplate.

One drive is operating more than one motor.

Set L1-01 = 0 [Motor Overload (oL1) Protection = Disabled], connect thermal overload relay to each motor to prevent damage to the motor.

The electronic thermal protector qualities and the motor overload properties do not match.

• Examine the motor qualities and set L1-01 [Motor Overload (oL1) Protection] correctly.

• Connect a thermal overload relay to the motor.

The electronic thermal protector is operating at an incorrect level.

Set E2-01 [Motor Rated Current (FLA)] correctly to the value specified by the motor nameplate.

There is increased motor loss from overexcitation operation.

• Lower the value set in n3-13 [OverexcitationBraking (OEB) Gain].

• Set L3-04 ≠ 4 [Stall Prevention during Decel ≠ Overexcitation/High Flux].

• Set n3-23 = 0 [Overexcitation Braking Operation = Disabled].

The speed search-related parameters are set incorrectly.

• Examine the settings for all speed search related parameters.

• Adjust b3-03 [Speed Search Deceleration Time].

• Set b3-24 = 1 [Speed Search Method Selection = Speed Estimation] after Auto-Tuning.

Phase loss in the input power supply is causing the output current to change.

Make sure that there is no phase loss, and repair problems.

The motor main circuit cable is too long.

• Replace the drive with a larger capacity model.

• Decrease C6-02 [Carrier Frequency]. Or set C6-02 = B.