Code

Name

Causes

Possible Solutions

oL1

Motor Overload

The load is too heavy.

Decrease the load.

Note:

Reset oL1 when U4-16 [Motor oL1 Level] < 100.

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 align.

  • 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.

Overload occurred during overexcitation deceleration.

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

  • Decrease the value set in n3-21 [HSB Current Suppression Level].
Note:

  • The drive detects this fault if the electronic thermal protector of the drive started the motor overload protection.

  • Do a Fault Reset to clear the fault.

  • L5-07 [Fault Reset Enable Select Grp1] disables the Auto Restart function.