6
-44
Control Method and Carrier Frequency Settings
Carrier frequency settings are restricted as listed in the following table according to the control method selec-
tion.
* The upper limit of the carrier frequency depends on the Inverter capacity.
Carrier Frequency Setting Precautions
When selecting the carrier frequency, observe the following precautions.
• Do not change C6-02 (Carrier Frequency Selection) from the initial value when using flux vector control
mode (A1-02 = 3) or open-loop vector 2 control mode (A1-02 = 4) in applications with frequent starts and
stops, such as cranes and elevators.
• If the carrier frequency is increased, the transistor inside the Inverter will be subjected to heat stress and
the service life of the Inverter may decrease.
• You must take into consideration the selection of the Inverter capacity and the settings of the user constants
when changing the carrier frequency from the initial value to reduce the metallic noise of a motor.
Contact your Yaskawa representative for details.
• 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 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.
• When using V/f control or V/f control with PG, you can vary the carrier frequency according to 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 (Carrier Frequency Proportional Gain).
Control Method Carrier Frequency
V/f control with or without a PG
1: 2.0 kHz
2: 5.0 kHz
3: 8.0 kHz
4: 10.0 kHz
5: 12.5 kHz
6: 15.0 kHz
F: User setting*
Detailed settings are available in C6-03, C6-04, and C6-05.
Open-loop vector 1 control or
Flux vector control
1: 2.0 kHz
2: 5.0 kHz
3: 8.0 kHz
4: 10.0 kHz
5: 12.5 kHz
6: 15.0 kHz
F: User setting*
The upper limit of the carrier frequency is determined by C6-03.
Open-loop vector 2 control
1: 2.0 kHz
2: 4.0 kHz
3: 6.0 kHz
4: 8.0 kHz
Wiring Length 50 m or less 100 m or less Over 100 m
C6-02 (carrier frequency
selection) setting
1 to 6 (15 kHz) 1 to 4 (10 kHz) 1 to 2 (5 kHz)
TOE-S616-60.1.book 44 ページ ２０１７年８月４日 金曜日 午後３時４１分
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