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By setting any of "100 to 123", the electronic overcurrent protection thermal characteristic
(applied motor) can be changed as indicated below according to the ON/OFF status of the RT
signal:
RT Signal
Electronic Overcurrent Protection Thermal Characteristic (Applied Motor)
OFF
As indicated in the above table
ON
Constant-torque motor
Set this parameter correctly according to the motor used.
Incorrect setting may cause the motor to overheat and burn.
" " PWM carrier frequency (Pr. 72, Pr. 240)
4.2.27 PWM carrier frequency (Pr. 72, Pr. 240)
Pr. 72 "PWM frequency selection"
Pr. 240 "Soft-PWM setting"
You can change the motor tone.
! By parameter setting, you can select Soft-PWM control which changes the motor
tone.
! Soft-PWM control changes motor noise from a metallic tone into an unoffending
complex tone.
Parameter Number
72
240
<Setting>
! Refer to the following list and set the parameters:
Parameter
Setting
Number
72
0 to 15
0
240
1
Note: 1. Note that when the inverter is run at the ambient temperature above 40°C
with a 2kHz or higher value set in Pr. 72, the rated output current of the
inverter must be reduced. (Refer to page 186 (depending upon the inverter.)
2. An increased PWM frequency will decrease motor noise but noise and
leakage current will increase. Take proper action (refer to pages 32 to 37).
CAUTION
Factory Setting
1
1
PWM carrier frequency can be changed.
The setting displayed is in [kHz].
Note that 0 indicates 0.7kHz and 15 indicates 14.5kHz.
Soft-PWM invalid
When any of "0 to 5" is set in Pr. 72, Soft-PWM is made valid.
99
PARAMETERS
Setting Range
0 to 15
15 : 14.5kHz
0, 1
Description
Remarks
0
: 0.7kHz,
1: Soft-PWM valid
4
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