Chapter 5 Parameters
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VFD-B Series
Revision July 2008, BE16, SW V4.08 & V5.00
5-37
EF
Frequency
Frequency
frequency output
motor
speed
EF
operation
command
stops according to
decel eration time
When Pr.02-02 is set to 2 or 3
frequency
output
free run to stop
operation
command
When Pr.02-02 is set to 0 or 1
motor
speed
02 - 03
PWM Carrier Frequency Selections
Unit: 1
230V/460V Series
Power
1-5hp
0.75-3.7kW
7.5-25hp
5.5-18.5kW
30-60hp
22-45kW
75-100hp
55-75kW
Setting Range
01-15 kHz
01-15 kHz
01-09 kHz
01-06 kHz
Factory Setting
15 kHz
09 kHz
06 kHz
06 kHz
575V Series
Power
1-15hp
0.75-11kW
20-60hp
15-45kW
75-100hp
55-75kW
Setting Range
01-10 kHz
01-08 kHz
01-06 kHz
Factory Setting
06 kHz
06 kHz
06 kHz
This parameter determines the PWM carrier frequency of the AC motor drive.
1kHz
8kHz
15kHz
Carrier
Frequency
Acoustic
Noise
Electromagnetic
Noise or leakage
current
Heat
Dissipation
Current
Wave
Significant
Minimal
Significant
Minimal
Minimal
Significant
Minimal
Significant
From the table, we see that the PWM carrier frequency has a significant influence on the
electromagnetic noise, AC motor drive heat dissipation, and motor acoustic noise.