Yaskawa Matrix Converter User Manual download pdf (Page 346)

Troubleshooting

7-25

 Mechanical Oscillation

Use the following information when there is mechanical oscillation.

The machinery produces an irregular sound.

The following causes are possible.

There may be resonance between the mechanical system's characteristic frequency and the

carrier frequency.

The motor is running with no problems and the machinery is oscillating with a high-pitched whine. To prevent

this type of resonance, adjust the carrier frequency with parameters C6-02 (Carrier Frequency Selection).

There may be resonance between a machine’s characteristic frequency and the output fre-

quency of the MxC.

Either use the jump frequency functions in parameters d3-01 to d3-04 or install rubber padding on the motor

base to reduce oscillation.

Oscillation and hunting occur in Open Loop Vector Control.

The gain adjustment may be insufficient. Reset the gain to a more effective level by adjusting parameters C4-

02 (Torque Compensation Primary Delay time), n2-01 (Speed Feedback Detection Control (AFR) Gain), and

C3-02 (Slip Compensation Primary Delay Time) in order. Lower the gain setting and raise the primary delay

time setting.

Open Loop Vector Control will not operate the motor if Auto-Tuning has not yet been performed. Perform

Auto-Tuning, or calculate and set the motor parameters manually. Alternatively, change the Control Method

Selection to the V/f Control Method (A1-02 = 0).

Oscillation and hunting are occurring in V/f control.

The gain adjustment may be insufficient. Reset the gain to a more effective level by adjusting parameters C4-

02 (Torque Compensation Primary Delay Time), C3-02 (Slip Compensation Primary Delay Time), and n1-02

(Hunting-Prevention Gain) in order. Lower the gain setting and raise the primary delay time setting.

Oscillation and hunting are occurring in Flux Vector Control.

The gain adjustment is insufficient. Adjust the various gains for speed control (ASR). If the oscillation points

overlap with those of the machine and cannot be eliminated, increase the primary delay time constant for

speed control (ASR) in C5-06 and then readjust the gains.

If Auto-Tuning is not performed, proper performance cannot be achieved for vector control. Perform Auto-

Tuning or set the motor parameters according to calculations.

Oscillation and hunting are occurring with PID control.

If there is oscillation or hunting during PID control, check the oscillation cycle and individually adjust P, I,

and D parameters. (Refer to page 6-98.)

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Yaskawa Matrix Converter User Manual Page 346