Pwm Carrier Frequency And Soft-Pwm Control - Mitsubishi Electric FR-CS84-012 Instruction Manual

 Access to parameters according to the password status
Password protection disabled / Parameters
Parameter
Pr.297 = 9999 (read only)
Read ○
Pr.296
Write ○
Read ○
Pr.297
Write ×
Pr.CLR
Parameter clear ○
(Write)
ALL.C All
parameter clear ○
(Write)
Pr.CPY
Parameter copy ○
(Write)
*1 All parameter clear cannot be performed during the inverter operation.
*2 Inputting a password is possible but the locked-up password cannot be unlocked or reset even with the valid password.
NOTE
• When "4, 5, 104, or 105" is set in Pr.296 and a password is set, Pr.15 JOG frequency is not listed on the parameter unit (FR-
PU07).
• When a password has been set and parameters are locked, Parameter copy cannot be performed using the operation panel
or parameter unit.
Parameters referred to
Pr.77 Parameter write selection
Pr.551 PU mode operation command source selection
5.3.9

PWM carrier frequency and Soft-PWM control

The motor sound can be changed.
Pr. Name
72
PWM frequency selection 2
E600
240 Soft-PWM operation
E601 selection
 Changing the PWM carrier frequency (Pr.72)
• The PWM carrier frequency of the inverter can be changed.
• Changing the PWM carrier frequency can be effective for avoiding the resonance frequency of the mechanical system or
motor, as a countermeasure against EMI generated from the inverter, or for reducing leakage current caused by PWM
switching.
 Soft-PWM control (Pr.240)
• Soft-PWM control is a function that changes the motor noise from a metallic sound into an inoffensive, complex tone.
• Setting Pr.240 = "1 or 11" enables the Soft-PWM control.
• Setting Pr.240 "10 or 11" enables the Soft-PWM control in the low-speed range.
• To enable the Soft-PWM control, set Pr.72 to 5 kHz or less.
92
5. PARAMETERS
5.3 (E) Environment setting parameters
unlocked
Pr.296 = 9999 Pr.296 ≠ 9999
Pr.297 = 9999 (read only)
○
○
○
○
○
○
○
page 89
page 105
Initial
value
2 to 12
0
1
1
10
11
Parameters locked
Pr.296 ≠ 9999
Pr.297 = any of 0 to 4 (read
○
×
○
○
×
*1
○
×
Setting range
The PWM carrier frequency can be changed. The setting value
represents the frequency in kHz.
Soft-PWM control disabled.
Soft-PWM control enabled.
Soft-PWM control disabled (Soft-PWM control in the low-speed
range enabled).
Soft-PWM control enabled (Soft-PWM control in the low-speed
range enabled).
Password locked up
Pr.296 = any of 101 to 106
Pr.297 = 5 (read only)
only)
○
×
○
*2
○
×
*1
○
×
○: Enabled, ×: Disabled
Description