Yaskawa Z1000U User Manual download pdf (Page 186)

5.2 Motor Performance Fine-Tuning

This section offers helpful information for counteracting oscillation, hunting, and other problems that occur while performing

a trial run. Refer to the section below that corresponds to the motor control method used.

Note: This section describes commonly edited parameters that may be set incorrectly. Consult Yaskawa for more information on detailed settings

and for fine-tuning the drive.

Fine-Tuning V/f Control

Table 5.1 Parameters for Fine-Tuning Performance in V/f

Problem Parameter No. Corrective Action Default

Suggested

Setting

Motor hunting and

oscillation at speeds

between 10 and 40 Hz

Hunting Prevention Gain

(n1-02)

• Reduce the setting if insufficient motor torque relative to the size

of the load causes hunting.

• Increase the setting when motor hunting and oscillation occur

with a light load.

• Reduce the setting if hunting occurs when using a motor with a

relatively low inductance, such as a high-frequency motor or a

motor with a larger frame size.

1.00 0.10 to 2.00

• Motor noise

• Motor hunting and

oscillation at speeds up

to 40 Hz

Carrier Frequency

Selection (C6-02)

• Increase the carrier frequency If the motor noise is too loud.

• Lower the carrier frequency when motor hunting and oscillation

occur at speeds up to 40 Hz.

• The default setting for the carrier frequency depends on the drive

capacity (o2-04).

1 (2 kHz) 1 to max. setting

• Poor torque or speed

response

• Motor hunting and

oscillation

Torque Compensation

Primary Delay Time

(C4-02)

• Reduce the setting if motor torque and speed response are too

slow.

• Increase the setting if motor hunting and oscillation occur.

Depends on

o2-04, Drive

Model

Selection

100 to 1000 ms

• Poor motor torque at

speeds below 10 Hz

• Motor hunting and

oscillation

Torque Compensation

Gain (C4-01)

• Increase the setting if motor torque is insufficient at speeds

below 10 Hz.

• Reduce the setting if motor hunting and oscillation with a

relatively light load.

1.00 0.50 to 1.50

• Poor motor torque at

low speeds

• Motor instability at

motor start

Mid Output Voltage A

(E1-08)

Minimum Output

Voltage (E1-10)

• Increase the setting if motor torque is insufficient at speeds

below 10 Hz.

• Reduce the setting If motor instability occurs at motor start.

Depends on

A1-02,

E1-03, and

o2-04

Default setting

±5 V

5.2 Motor Performance Fine-Tuning

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Yaskawa Z1000U User Manual Page 186

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