Machine Protection
6-43
îš„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.
îš„Carrier Frequency Setting Precautions
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 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: Any 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: Any 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)
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