Application Selections; Setting The Carrier Frequency - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

Application Selections

Setting the Carrier Frequency

Using the following constants the carrier frequency setting can be fitted to the applications requirements.
Related Constants
No.
Con-
stant
No.
C6-02 Carrier frequency selection
C6-03 Carrier frequency upper limit
C6-04 Carrier frequency lower limit
Carrier frequency
C6-05
proportional gain
* 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.
When selecting the carrier frequency, observe the following precautions:
If the wiring distance between Inverter and motor is long: Set the carrier frequency low. (Use the following
•
values as guidelines.
C6-02 (carrier frequency)
setting
If speed and torque vary 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 set to vary depending on the output frequency as shown in the following dia-
•
gram, 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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Name
Selects the carrier frequency.
Select F to enable detailed settings using constants C6-03 to
C6-05.
Sets the upper and lower carrier frequency limits in kHz.
Set the carrier wave gain as shown below.
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
Wiring Length 50 m or less
0 to 6 (15 kHz)
Details
Output frequency x
(C6-05) x K
Output frequency
(Maximum output frequency)
100 m or less
0 to 4 (10 kHz)
Changes
Setting Factory Access
During
Range Setting Level
Opera-
tion?
*1
0 to F No Q
6
2.0 to
15.0 kHz
No A
15.0
*1
*2 *3
0.4 to
15.0 kHz
No A
15.0
*1
*2 *3
00 to 99
00 No A
*3
Over 100 m
0 to 2 (5 kHz)