Omron VARISPEED G7 -, Instruction Manual

Page: 233 / 417

6
-38
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 setting range depends on the control method of the Inverter.
* 2. The factory setting depends on the capacity of the Inverter.
* 3. The setting range depends on the capacity of the Inverter.
* 4. This constant can be monitored or set only when 1 is set for C6-01 and F is set for C6-02.
* 5. Displayed in Quick Programming Mode when motor 2 is set for a multi-function input.
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
C6-02
Carrier fre-
quency
selection
Select carrier wave fixed pattern.
Select F to enable detailed settings using con-
stants C6-03 to C6-05.
1 to F
6
*2
No Q Q Q A
No
*5
CarrierFreq
Sel
C6-03
Carrier
frequency
upper limit Set the carrier frequency upper limit and
lower limit in kHz units.
The carrier frequency gain is set as follows:
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
*3 *4
15.0
kHz
*2
No A A A A No
CarrierFreq
Max
C6-04
Carrier
frequency
lower limit
0.4 to
15.0
*3 *4
15.0
kHz
*2
No A A No No No
CarrierFreq
Min
C6-05
Carrier fre-
quency pro-
portional
gain
00 to
99
*4
00 No A A No No No
CarrierFreq
Gain
C6-11
Carrier fre-
quency
selection for
open-loop
vector con-
trol 2
Select the carrier frequency when open-loop
vector control 2 is used.
1: 2 kHz
2: 4 kHz
3: 6 kHz
4: 8 kHz
1 to 4 4 No
No
*5
No
*5
No
*5
No
*5
Q
Carrier Freq
Sel
Carrier frequency
Output frequency x (C6-05) x K
(Max. output frequency)
Output
frequency