YASKAWA Varispeed G7 - Machine Protection; Reducing Noise and Leakage Current

6-42
Machine Protection
This section explains functions for protecting the machine.
 Reducing Noise and Leakage Current
The switching frequency of the Inverter’s output transistor can be changed to reduce carrier noise and leakage
current from the motor.
Related Constants
* 1. The factory settings depend on the capacity of the Inverter. The values for a 200 V Class Inverter for 0.4 kW are given.
* 2. The setting ranges depend on the capacity of the Inverter. The values for a 200 V Class Inverter for 0.4 kW are given.
* 3. This constant can be monitored or set only when F is set for C6-02.
* 4. Displayed in Quick Programming Mode when motor 2 is set for a multi-function input.
* 5. The maximum output frequency depends on the setting for the carrier frequency (refer to page 6-43).
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vec-
tor
2
C6-02
Carrier fre-
quency
selection
Select carrier wave fixed pattern.
Select F to enable detailed settings using
constants C6-03 to C6-07.
1 to F
*2
6
*1
No Q Q Q Q
No
*4
224H
Carrier
Freq Sel
C6-03
*3
Carrier
frequency
upper limit
Set the carrier frequency upper limit and
lower limit in kHz units.
The carrier frequency gain is set as fol-
lows:
With the vector control method, the
upper limit of the carrier frequency is
fixed in C6-03.
K is a coefficient that depends on the
setting of 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
2.0 to
15.0
*2 *5
15.0
kHz
*1
No A A A A No 225H
Carrier
Freq Max
C6-04
*3
Carrier
frequency
lower limit
0.4 to
15.0
*2 *5
15.0
kHz
*1
No A A No No No 226H
Carrier
Freq Min
C6-05
*3
Carrier fre-
quency
propor-
tional gain
00 to
99
00 No A A No No No 227H
Carrier
Freq Gain
C6-11
Carrier fre-
quency
selection
for open-
loop vector
2 control
Select the carrier frequency when open-
loop vector 2 control is used.
1: 2 kHz
2: 4 kHz
3: 6 kHz
4: 8 kHz
1 to 4
4
*1
No
No
*4
No
*4
No
*4
No
*4
Q22DH
Carrier
Freq Sel
Carrier frequency
Output frequency x (C6-05) x K
(Max. output frequency)
Output
frequency