E6581595
F-22
6
6.11 PWM carrier frequency
: PWM carrier frequency
: Random mode
: Carrier frequency control mode selection
Function
These parameters are effective in preventing the magnetic noise reduction from the motor, noise reduction,
the measure against resonance with load machine, etc.
1) When you reduce the magnetic noise from the motor, increase the
f300
: PWM carrier frequency.
If
f312
: random mode is set up when the
f300
cannot be set up highly, the magnetic noise from
the motor is decreased.
2) When you reduce the noise which generates from the inverter, decrease the carrier frequency.
However, the magnetic noise from the motor is increased.
3) When resonating with the load machine and the fan cover of the motor, an effect will be acquired if
f300
is changed.
4) If
f316
: PWM carrier frequency control mode selection is set to "Carrier frequency with automatic
reduction" when carrying out the trip by
oh
(overheat) or
ol3
(main module overload), the carrier
frequency is reduced automatically and the trip can be avoided. However, the magnetic noise from the
motor is increased.
[Parameter setting]
Title Function
Adjustment range
Default setting
PWM carrier frequency
2-16 (kHz)
12
Random mode
0: Disabled, 1: Automatic setting
0
Carrier frequency control mode
selection
0: Carrier frequency without reduction
1: Carrier frequency with automatic reduction
1
Note 1: By
f300
setting and ambient temperature, current reduction may be required.
Refer to the table on the following page.
Note 2: PWM carrier frequency is increased at high output frequency area (guide: 100 Hz or more) for stable
operation, even if
f300
is set to low PWM carrier frequency.
Note 3: Random mode is exercised with the low output frequency which a magnetic noise from the motor worries
when
f300
is 8kHz or less.
Note 4: If
f316
is set to “Carrier frequency without reduction”,
oh
(overheat) or
ol3
(main module overload),
occurs. In this case, to avoid the trip, reduce the stall prevention level (
f601
,
f185
) properly.
