6-2
Application Selections
Setting the Carrier Frequency
Using the following constants the carrier frequency setting can be fitted to the applications requirements.
Related Constants
* 1. The factory settings depend on the Inverter capacity.
* 2. The setting ranges depend on the Inverter capacity.
* 3. Can be set and referenced only when C6-02 is set to F.
When selecting the carrier frequency, observe the following precautions:
• If the wiring distance between Inverter and motor is long: Set the carrier frequency low. (Use the following
values as guidelines.
• If speed and torque vary at low speeds: Set the carrier frequency low.
• If Inverter noise is affecting peripheral devices: Set the carrier frequency low.
• If leakage current from the Inverter is large: Set the carrier frequency low.
• If metallic noise from the motor is large: Set the carrier frequency high.
• The carrier frequency can be set to vary depending on the output frequency as shown in the following dia-
gram, by setting C6-03 (Carrier Frequency Upper Limit), C6-04 (Carrier Frequency Lower Limit), and
C6-05 (Carrier Frequency Proportional Gain).
No.
Con-
stant
No.
Name Details
Setting
Range
Factory
Setting
Changes
During
Opera-
tion?
Access
Level
C6-02 Carrier frequency selection
Selects the carrier frequency.
Select F to enable detailed settings using constants C6-03 to
C6-05.
0 to F
6
*1
No Q
C6-03 Carrier frequency upper limit
Sets the upper and lower carrier frequency limits in kHz.
Set the carrier wave gain as shown below.
K is the coefficient determined by the set value in
C6-03.
C6-03 ≥ 10.0 kHz: K = 3
10.0 kHz > C6-03 ≥ 5.0 kHz : K = 2
5.0 kHz > C6-03: K = 1
2.0 to
15.0
*2 *3
15.0 kHz
*1
No A
C6-04 Carrier frequency lower limit
0.4 to
15.0
*2 *3
15.0 kHz
*1
No A
C6-05
Carrier frequency
proportional gain
00 to 99
*3
00 No A
Wiring Length 50 m or less 100 m or less Over 100 m
C6-02 (carrier frequency)
setting
0 to 6 (15 kHz) 0 to 4 (10 kHz) 0 to 2 (5 kHz)
Carrier frequency
Output frequency x
(C6-05) x K
Output frequency
(Maximum output frequency)
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