YASKAWA G7 Series, Technical Manual

Page: 257 / 456

Machine Protection
6-
39
Machine Protection
This section explains functions for protecting the machine.
‹
Reducing Noise and Leakage Current
The switching frequency of the Drive’s output transistor can be changed to reduce carrier noise and leakage
current from the motor.
„ Related Parameters
* 1. The setting range depends on the control method of the Drive.
* 2. The factory setting depends on the capacity of the Drive.
* 3. The setting range depends on the capacity of the Drive.
* 4. This parameter 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.
Parameter
Number
Name
Description
Setting
Range Factory
Setting
Change
during
Operation
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vector
Open
Loop
Vector
2
C6-02
Carrier
Frequency
Selection Selects the number of pulses per second of
the output voltage waveform. Setting range
determined by C6-01 setting.
0: Low noise
1: Fc = 2.0 kHz
2: Fc = 5.0 kHz
3: Fc = 8.0 kHz
4: Fc = 10.0 kHz
5: Fc = 12.5 kHz
6: Fc = 15.0 kHz
OF: Program (Determined by the settings of
C6-03 thru C6-05)
1 to F
6
*2
No Q Q Q A
No
*5
CarrierFreq
Sel
C6-03
Carrier
Frequency
Upper Limit Sets the carrier frequency upper limit and
lower limit in kHz units.
The carrier frequency gain is set as follows:
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
Maximum carrier frequency allowed when
C6-02 = F.
Note: Carrier frequency is set to C6-03
(upper limit) when operating in Vector
Control Mode.
C6-05 Sets the relationship of output
frequency to carrier frequency when
C6-02 = OF.
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
Frequency
Proportional
Gain
00
to
99
*4
00 No A A No No No
CarrierFreq
Gain
C6-11
Carrier
Frequency
Selection for
Open Loop
Vector 2
Selects the carrier frequency during Vector
Control 2 wo/PG.
1: 2kHz (3-phase modulation)
2: 4kHz (3-phase modulation)
3: 6kHz (3-phase modulation)
4: 8kHz (3-phase modulation)
1 to 4
4
*2
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
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