User`s manual

Setting the Carrier Frequency Chapter 6-1

This chapter provides information on the use of advanced functions of the

Inverter for operation. Refer to this chapter to use the various advanced

functions, such as stall prevention, carrier frequency setting, overtorque

detection, torque compensation, and slip compensation.

6-1 Setting the Carrier Frequency

The carrier frequency of the J7AZ can be fixed or varied in proportion to the

output frequency.

Note The default setting varies with the capacity of the Inverter model.

Set Values

• The default setting does not need any changes in normal operation.

• Change the default setting in the following cases.

The wiring distance between the Inverter and motor is long:

Set the Inverter to a lower carrier frequency.

Reference carrier frequency: 10 kHz at a maximum wiring distance

of 100 m and 5 kHz at a wiring distance exceeding 100 m.

Excessive speed or torque dispersion at low speed:

Set the carrier frequency to a lower value.

Note The carrier frequency changes as shown in the following graph with 7 through

9 set in n46.

n46 Carrier Frequency Selection Changes during

operation

Setting

range

1 to 4, 7 to 9 Unit of

setting

1 Default setting (see note)

Value Description

1 2.5 kHz

2 5.0 kHz

3 7.5 kHz

4 10.0 kHz

7 2.5 kHz (12×): 12 times as high as output frequency (between 1.0 and 2.5 kHz)

8 2.5 kHz (24×): 24 times as high as output frequency (between 1.0 and 2.5 kHz)

9 2.5 kHz (36×): 36 times as high as output frequency (between 1.0 and 2.5 kHz)

Carrier Frequency (n46: 7 through 9)

Carrier

Frequency

2.5kHz

1.0kHz

83.3 Hz (Set value: 7)

41.6 Hz (Set value: 8)

27.7 Hz (Set value: 9)

208.3 Hz (Set value: 7)

104.1 Hz (Set value: 8)

69.4 Hz (Set value: 9)

Output frequency