Machine Protection; Reducing Noise And Leakage Current - YASKAWA Varispeed G7 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
Con-
stant
Number
C6-02
C6-03
*3
C6-04
*3
C6-05
*3
C6-11
* 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).
-42
6
Name
Description
Display
Carrier fre-
quency
Select carrier wave fixed pattern.
selection
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.
upper limit The carrier frequency gain is set as fol-
lows:
Carrier
With the vector control method, the
Freq Max
upper limit of the carrier frequency is
fixed in C6-03.
Carrier
frequency
Carrier frequency
lower limit
Carrier
Freq Min
Output frequency x (C6-05) x K
Carrier fre-
quency
(Max. output frequency)
propor-
K is a coefficient that depends on the
tional gain
setting of C6-03.
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
loop vector
2: 4 kHz
2 control
3: 6 kHz
4: 8 kHz
Carrier
Freq Sel
Change
Setting Factory during
Range Setting Opera-
tion
1 to F 6
No
*2 *1
2.0 to 15.0
No
15.0 kHz
*2 *5 *1
0.4 to 15.0
No
15.0 kHz
*2 *5 *1
Output
frequency
00 to
00 No
99
4
1 to 4 No
*1
Control Methods
MEMO
Open
Open
V/f Flux Loop
Loop
Regis-
V/f with Vec- Vec-
Vector
PG tor tor
1
2
No
Q Q Q Q 224H
*4
A A A A No 225H
A A No No No 226H
A A No No No 227H
No No No No
Q 22DH
*4 *4 *4 *4
BUS
ter