Pwm Carrier Frequency Selection (Pr. 72, Pr. 240) - Mitsubishi Electric FR-V500 Instruction Manual

Operation selection function 2 (Pr. 65 to Pr. 79)
3.11.3 PWM carrier frequency selection (Pr. 72, Pr. 240
By parameter setting, you can set whether to exercise the Soft-PWM control that changes the motor tone or
select with or without long wiring mode.
• Soft-PWM control is a control method that changes the motor noise from a metallic tone into an unoffending
complex tone.
• Surge voltage is suppressed regardless of wiring length in the long wiring mode. (When operating the 400V
motor with wiring length of 40m or longer, select long wiring mode.)
Parameter Name
PWM frequency
72
selection
240 Soft-PWM setting
<Setting>
Pr. 72
Description
Setting
1
2
3
4
5
6
CAUTION
1. An increased PWM carrier frequency will decrease the motor sound but increase noise and leakage
currents. Therefore, perform the reduction techniques. (Refer to page 12.)
2. Since Pr. 240 is factory-set to "10", PWM carrier frequency is 2.25 kHz constant even if "2" or larger
value is set in Pr. 72. Set "0 or 1" in Pr. 240 to decrease the motor noise.
Pr. 240
Setting
Soft-PWM
0 Invalid
Valid
1
(when Pr. 72 = "1 or 2")
10 Invalid
11 Valid
CAUTION
1. When long wiring mode is made valid, torque reduces about 5% in the constant power range.
2. The output voltage at rated frequency decreases by about 1.5V maximum (200V class)/about 3.0V
maximum (400V class) during V/F control.
3. Use an insulation-enhanced motor for the 400V class. Refer to page 22 for inverter driving of the 400V
class motor.
Factory Setting Setting Range
1
10
2.25kHz
4.5kHz
6.75kHz
9kHz
11.25kHz
13.5kHz
long wiring mode
Invalid
Invalid
Valid
Valid
speed
Remarks
1 to 6 Simple mode
0, 1, 10, 11 Extended mode
Description
Carrier frequency is 2.25kHz.
(The Pr.72 "PWM frequency selection" setting is
made invalid.)
112
)
torque position
Remarks
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