8
9
4
7
2
3
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.
n46
Setting range
1 to 4, 7 to 9
Carrier Frequency Selection
Unit of setting
1
Changes during operation
Default setting (see note)
No
Note The default setting varies with the capacity of the Inverter model.
Set Values
Value Description
5.0 kHz
7.5 kHz
10.0 kHz
2.5 kHz (12×): 12 times as high as output frequency (between 1.0 and 2.5 kHz)
2.5 kHz (24×): 24 times as high as output frequency (between 1.0 and 2.5 kHz)
2.5 kHz (36×): 36 times as high as output frequency (between 1.0 and 2.5 kHz)
Note
• 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.
The carrier frequency changes as shown in the following graph with 7 through
9 set in n46.
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
70
Setting the Carrier Frequency
Chapter 6-1
3-phase
200 V
Single-phase
200 V
3-phase 400 V
B0P1
B0P2
B0P4
B0P7
B1P5
40P2
40P4
40P7
20P1
20P2
20P4
20P7
21P5
22P2
24P0
41P5
42P2
44P0
The Inverter cannot maintain rated output current with the carrier frequency set to a value higher than the default one.
The following table shows the default value and a decrease in the output current of each Inverter model.
Be sure to use the Inverter so that there will be no decrease in rated output current.
CIMR-J7AZ-
Rated output current (A)
4 (10 kHz)
4 (10 kHz)
4 (10 kHz)
4 (10 kHz)
3 (7.5 kHz)
3 (7.5 kHz)
3 (7.5 kHz)
4 (10 kHz)
4 (10 kHz)
4 (10 kHz)
4 (10 kHz)
3 (7.5 kHz)
3 (7.5 kHz)
3 (7.5 kHz)
3 (7.5 kHz)
3 (7.5 kHz)
3 (7.5 kHz)
3 (7.5 kHz)
0.8
1.6
3.0
5.0
8.0
1.2
1.8
3.4
0.8
1.6
3.0
5.0
8.0
11.0
17.5
4.8
5.5
8.6
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Set to 3 Reduced rated output current (A)
Q
Q
Q
10.0
16.5
Q
Q
Q
Q
Set to 4 Reduced rated output current (A)
Q
Q
Q
Q
7.0
7.0
1.0
1.6
3.0
4.0
4.8
7.6 n75 Low Carrier Frequency at Low Speed Changes during operation
Default setting 0
No
Setting range
0, 1 Unit of setting
1
Set Values
0
1
Value Description
Low carrier frequency at low speed disabled.
Low carrier frequency at low speed enabled.
• Normally set n75 to 0.
• When the output frequency is 5 Hz or higher and the output current rate is
110% or less, the carrier frequency will be automatically reduced to 2.5
kHz with n75 set to 1. If the load is heavy at low speed, the Inverter will withstand higher overcurrent by suppressing the heat radiation of the
Inverter caused by the carrier frequency.
• This function is enabled with 2, 3, or 4 set in n46 for carrier frequency.
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