6
-2
Application and Overload Selections
Select the Overload to Suit the Application
Depending on the application, the carrier frequency can be changed. Pay attention to the following explana-
tions when changing the settings.
Related Parameters
* 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.
Carrier Frequency
When selecting the carrier frequency, observe the following precautions:
•
Adjust the carrier frequency according to the cases shown below.
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 are inconsistent 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 varied to match the output frequency, as shown in the following diagram, by
setting C6-03 (Carrier Frequency Upper Limit), C6-04 (Carrier Frequency Lower Limit) and C6-05 (Car-
rier Frequency Proportional Gain).
Param-
eter
No.
Name
Details
Setting
Range
Factory
Setting
Changes
During
Opera-
tion?
Access
Level
LCD
Display
C6-02
Carrier frequency selec-
tion
Select carrier wave fixed pattern.
Select F to enable detailed settings using parame-
ters C6-03 to C6-05.
1: Catrrier 2 kHz
2: Carrier 5 kHz
3: Carrier 8,0 kHz
4: Carrier 10.0 kHz
5: Carrier 12.5 kHz
6: Carrier 15 kHz
F: User set
*1
1 to F
6
*1
No
Q
CarrierFreq Sel
C6-03
Carrier frequency upper
limit
Set upper and lower carrier frequency limits in
kHz.
Set the carrier wave gain as shown below.
In vector control method, the carrier frequency is
fixed according to C6-03 (Carrier Frequency
Upper Limit).
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 = 2
2.0 to
15.0
*2 *3
15.0 kHz
*1
No
A
CarrierFreq Max
C6-04
Carrier frequency lower
limit
0.4 to
15.0
*2 *3
15.0 kHz
*1
No
A
CarrierFreq Min
C6-05
Carrier frequency pro-
portional gain
00 to 99
*3
00
No
A
CarrierFreq Gain
Wiring Length
50 m or less
100 m or less
Over 100 m
C6-02 (carrier frequency)
setting
1 to 6 (15 kHz)
1 to 4 (10 kHz)
1 to 2 (5 kHz)
Carrier frequency
Output frequency x
(C6-05) x K
Output frequency
(Maximum output frequency)
