Yaskawa G7 Drive - Manual (Page 257)

6
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„ Control Mode and Carrier Frequency Settings
Carrier frequency settings are restricted as listed in the following table according to the control mode selec-
tion.
* 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.)
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).
Fig 6.32
Control Mode 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 control 1 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 control 2
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)
C6-03
C6-04
Output frequency
Output frequency × C6-05
× K*
E1-04
Max. Output Frequency
Carrier Frequency
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
*