oC

The load is too heavy.

• Measure the current flowing into the motor.

• Replace the drive with a larger capacity model if the current value is more than the drive rated current.

• Decrease the load or replace with a larger drive to prevent sudden changes in the current level.

Overheating caused damage to the motor or the motor insulation is not satisfactory.

Measure the motor insulation resistance, and replace the motor if there is electrical conduction or unserviceable insulation.

The motor main circuit cable is contacting ground to make a short circuit.

• Examine the motor main circuit cable for damage, and repair short circuits.

• Measure the resistance between the motor main circuit cable and the ground terminal. If there is electrical conduction, replace the cable.

A short circuit or ground fault on the drive output side caused damage to the output transistor of the drive.

• Make sure that there is not a short circuit in terminal B1 and terminals U/T1, V/T2, and W/T3. Make sure that there is not a short circuit in terminals - and terminals U/T1, V/T2, and W/T3.

• If there is a short circuit, contact Yaskawa or your nearest sales representative.

The acceleration time is too short.

• Calculate the torque necessary during acceleration related to the load inertia and the specified acceleration time.

• Increase the values set in C1-01, C1-03, C1-05, or C1-07 [Acceleration Times] to get the necessary torque.

• Increase the values set in C2-01 to C2-04 [S-Curve Characteristics] to get the necessary torque.

• Replace the drive with a larger capacity model.

The drive is trying to operate a specialized motor or a motor that is larger than the maximum applicable motor output of the drive.

• Examine the motor nameplate, the motor, and the drive to make sure that the drive rated current is larger than the motor rated current.

• Replace the drive with a larger capacity model.

A magnetic contactor was switched at the output.

Set the operation sequence to not turn ON or OFF the magnetic contactor while the drive is outputting voltage.

The V/f pattern settings are incorrect.

• 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.

The torque compensation gain is too large.

Decrease the value set in C4-01 [Torque Compensation Gain] to make sure that the motor does not stall.

Electrical interference caused a problem.

Examine the control circuit lines, main circuit lines, and ground wiring, and decrease the effects of electrical interference.

The gain during overexcitation operation is too large.

• Find the time when the fault occurs.

• If the fault occurs at the same time as overexcitation operation, decrease the value set in n3-13 [OverexcitationBraking (OEB) Gain] and consider the motor flux saturation.

The drive received a Run command while the motor was coasting.

• Examine the sequence and input the Run command after the motor fully stops.

• Set b3-01 = 1 [Speed Search at Start Selection = Enabled] or set H1-xx = 61, 62 [Speed Search from Fmax or Fref] to input speed search commands from the MFDI terminals.

In PM Control Methods, the setting of the motor code is incorrect.

• Enter the correct motor code to E5-01 [PM Motor Code Selection] as specified by the PM motor.

• For specialized motors, refer to the motor test report and set E5-xx [PM Motor Settings] correctly.

If the drive detects the fault at start or in the low speed range (10% or less) and n8-57 = 1 [HFI Overlap Selection = Enabled] for PM Control methods, the high frequency injection gain is too high.

• Set E5-xx [PM Motor Parameters] correctly or do Rotational Auto-Tuning.

• Decrease the value of n8-41 [HFI P Gain] in 0.5-unit increments.

  Note:

  Set n8-41 > 0.0 for IPM motors.

The current flowing in the motor is more than the value set in L8-27 [Overcurrent Detection Gain] for PM Control Methods.

Correct the value set in L8-27.

The control method is set incorrectly for the motor.

Set A1-02 [Control Method Selection] correctly.

The motor main circuit cable is too long.

Replace the drive with a larger capacity model.

Speed search does not complete at start when you set A1-02 = 8 [EZ Vector Control] and use an induction motor.

When E9-01 = 0 [Motor Type Selection = Induction (IM)], set b3-24 = 2 [Speed Search Method Selection = Current Detection Speed Search].

An overcurrent 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].

When you use an IE3 premium efficiency motor.

Use these values to adjust the parameters.