113
Operation selection function
2
2.10.2 PWM carrier frequency and long wiring mode (Pr. 70
, Pr. 72
)
<Setting>
•
By parameter setting, you can set whether to exercise 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 the long
wiring mode.)
Refer to
(page 78).
You can change the motor sound.
Parameter
Name
Factory
Setting
Setting
Range
Remarks
70
Soft-PWM setting
1
0, 1, 10, 11 Setting is enabled when
Pr. 30 = "1"
72
PWM frequency selection
1
0 to 15
Pr. 70
Setting
Description
Soft-PWM
Long wiring mode
Remarks
0
Invalid
Invalid
⎯⎯
1
Valid
(When Pr. 72 setting
= any of "0" to "5")
Invalid
⎯⎯
10
Invalid
Valid
•
When Pr. 72 "PWM frequency
selection" = 1 or more, the PWM
carrier frequency is constant at
1kHz. (When "0" is set, the PWM
carrier frequency is constant at
0.7kHz.)
11
Valid
Valid
CAUTION
1.When "10 or 11" (long wiring mode) is set in Pr. 70, the output voltage at rated
frequency drops 5V maximum.
2.For the 400V class, use an insulation-enhanced motor.
Refer to page 25 for an inverter-driven 400V class motor.
Pr. 72 Setting
Description
0 to 15
PWM carrier frequency can be changed.
The setting displayed is in [kHz].
Note that 0 indicates 0.7kHz and 15 indicates 14.5kHz.
REMARKS
•
An increased PWM frequency will decrease the motor sound but increase noise and leakage
currents. Therefore, perform the reduction techniques. (Refer to page 18.)
•
Metallic sound may be generated from the motor at sudden deceleration but it is not a fault.
Summary of Contents for FR-S500 Series
Page 178: ...168 MEMO ...
Page 215: ...205 APPENDIX APPENDIX 1 Parameter instruction code list 206 ...