Mitsubishi Electric 800 Series Instruction Manual page 181

• 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 (slower than 10% of the rated motor frequency), the carrier frequency is automatically changed to 2 kHz. (For FR-F860-
00090 or lower)
NOTE
• In the low-speed range (about 10 Hz or lower), the carrier frequency may be automatically lowered. Motor noise increases,
but not to the point of failure.
 Soft-PWM control (Pr.240)
• Soft-PWM control is a control method that changes the motor noise from a metallic sound into an inoffensive, complex
tone.
• Setting Pr.240 = "1" will enable the Soft-PWM control.
• To enable the Soft-PWM control for the FR-F860-00680 or lower, set Pr.72 to "5 kHz or less". To enable it for the FR-F860-
01080 or higher, set Pr.72 to "4 kHz or less".
180
5. PARAMETERS
5.4 (E) Environment setting parameters
page 145.)
Carrier frequency (kHz)
Normal-response operation
2
*1
6
*1
10
*1
14
Fast-response mode
4
8
12