YASKAWA G7 Series Technical Manual page 258

Control Mode and Carrier Frequency Settings
Carrier frequency settings are restricted as listed in the following table according to the control mode selec-
tion.
V/f control with or without a PG
Open-loop vector control 1 or
Flux vector control
Open-loop vector control 2
* The upper limit of the carrier frequency depends on the Drive capacity.
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 Drive and motor is long: Set the carrier frequency low. (Use the following
values as guidelines.)
C6-02 (carrier frequency
selection) setting
If speed and torque are inconsistent at low speeds: Set the carrier frequency low.
If leakage current from the Drive 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).
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Control Mode
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.
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.
1: 2.0 kHz
2: 4.0 kHz
3: 6.0 kHz
4: 8.0 kHz
Wiring Length 50 m or less
1 to 6 (15 kHz)
Carrier Frequency
C6-03
C6-04
* 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
Carrier Frequency
100 m or less
1 to 4 (10 kHz)
Output frequency × C6-05
× K*
E1-04
Max. Output Frequency
Fig 6.32
Over 100 m
1 to 2 (5 kHz)
Output frequency