Omron J7 series, User Manual

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70
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
No
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