Machine Protection; Reducing Noise And Leakage Current - YASKAWA Varispeed G7 Series Instruction Manual

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
Name
Con-
stant
Display
Number
Carrier fre-
quency
Select carrier wave fixed pattern.
selection
C6-02 Select F to enable detailed settings using
constants C6-03 to C6-07.
Carrier
Freq Sel
Carrier Set the carrier frequency upper limit and
frequency lower limit in kHz units.
C6-03
upper limit The carrier frequency gain is set as fol-
*3
lows:
Carrier
With the vector control method, the
Freq Max
upper limit of the carrier frequency is
fixed in C6-03.
Carrier
frequency
C6-04
lower limit
*3
Carrier
Freq Min
Carrier fre-
quency
propor-
K is a coefficient that depends on the
tional gain
C6-05
setting of C6-03.
*3
C6-03 ≥ 10.0 kHz: K = 3
Carrier
10.0 kHz > C6-03 ≥ 5.0 kHz: K = 2
Freq Gain
5.0 kHz > C6-03: K = 1
Carrier fre-
quency
Select the carrier frequency when open-
selection
loop vector 2 control is used.
for open-
1: 2 kHz
C6-11
loop vector
2: 4 kHz
2 control
3: 6 kHz
4: 8 kHz
Carrier
Freq Sel
* 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 6-44).
* 6. This setting is for software versions PRG 1040 and later. The factory setting with software versions PRG 1039 and earlier depends on the Inverter
capacity.
Description
Carrier frequency
Output frequency x (C6-05) x K
Output
frequency
(Max. output frequency)
Control Methods
Change
Setting Factory during
V/f
Range Setting Opera-
V/f with
tion
PG
1 to F 6
No Q Q
*2 *1
2.0 to 15.0
No A A
15.0 kHz
*2 *5 *1
0.4 to 15.0
No A A
15.0 kHz
*2 *5 *1
00 to
00 No A A
99
1 No No
1 to 4 No
*6
*4 *4

Machine Protection

MEMO
Open
Open
BUS
Flux Loop
Loop
Regis-
Vec-
Vec-
Vector
ter
tor tor
1
2
No
Q Q 224H
*4
A A No 225H
No No No 226H
No No No 227H
No No
Q 22DH
*4 *4
6-
43