Mitsubishi Electric FR-F800 Series Instruction Manual page 219

5.4.18 PWM carrier frequency and Soft-PWM control
The motor sound can be changed.
Pr.
72
PWM frequency selection 2
E600
240 Soft-PWM operation
E601 selection
260 PWM frequency
E602 automatic switchover
*1 The setting range of the FR-F820-02330(55K) or lower and the FR-F840-01160(55K) or lower
*2 The setting range of the FR-F820-03160(75K) or higher and the FR-F840-01800(75K) or higher
 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.
• Under PM motor control, the following carrier frequencies are used. (To select fast-response operation, refer to Pr.800
Control method selection on
Pr.72 setting
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
*1 In the low-speed range (less than 10% of the rated motor frequency), the carrier frequency is automatically changed to 2 kHz
(for the FR-F820-00490(11K) or lower and the FR-F840-00250(11K) or lower).
• When using an optional sine wave filter (MT-BSL/BSC), set "25" (2.5 kHz) in Pr.72 (for the FR-F820-03160(75K) or higher
and FR-F840-01800(75K) or higher).
NOTE
• In the low-speed range (less than about 10 Hz), the carrier frequency may be automatically lowered. Motor noise increases,
but not to the point of failure.
• When Pr.72 = "25", the following limitations apply.
- V/F control is forcibly set.
- Soft-PWM control is disabled.
- The maximum output frequency is 60 Hz.
218
5. PARAMETERS
5.4 (E) Environment setting parameters
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Initial
Name
value
0 to 15
0 to 6, 25
0
1
1
0
1
1
page 177.)
Carrier frequency (kHz)
Normal-response operation
2
*1
6
*1
10
*1
14
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Setting
range
*1 The PWM carrier frequency can be changed. The setting value
represents the frequency in kHz. However, "0" indicates 0.7 kHz, "15"
indicates 14.5 kHz, and "25" indicates 2.5 kHz. (The setting value "25"
*2
is for the sine wave filter only.)
Soft-PWM control disabled.
Soft-PWM control enabled.
PWM carrier frequency automatic reduction function disabled (for the
LD rating).
PWM carrier frequency automatic reduction function enabled.
Fast-response mode
4
8
12
Description