4–27
PWM Carrier Frequency Default Settings: 15/09/06/06
Range: 1 to 5 hp; 01 to 15 kHz Default Setting: 15
7.5 to 25 hp; 01 to 15 kHz 09
30 to 60 hp; 01 to 09 kHz 06
75 to 100 hp, 01 to 06 kHz 06
This parameter sets the carrier frequency of PWM (Pulse-Width Modulated)
output.
• In the table below, we see that the carrier frequency of PWM output has a
significant influence on the electromagnetic noise, leakage current and heat
dissipation of the AC drive, and the acoustic noise to the motor.
Slip Compensation Time Constant Default Setting: 0.10
Range: 0.05 to 10.00 sec
This parameter is usually applied to heavy-load applications in which the motor
speed is changed frequently. It acts as a damper for P2.01, Slip Compensation,
which changes the output frequency to compensate for motor slip due to heavy
loads. Frequent speed changes can cause system vibration, and P2.09 can be
adjusted while monitoring drive/motor operation to reduce that vibration.
Increasing P2.09 slows the Slip Compensation response
(loosens speed regulation).
Decreasing P2.09 speeds the Slip Compensation response
(tightens speed regulation).
• This parameter is enabled only in the “high-speed regulation” control modes;
(P2.10 = 04 or 05).
• This parameter is available only with AC drive firmware v1.05 or higher.
Refer to P9.39 to determine the drive’s firmware version.
P2.09
Carrier Frequency Acoustic Noise
Electromagnetic Noise,
Leakage Current
Heat Dissipation
1kHz significant minimal minimal
15kHz minimal moderate moderate
P2.08
Chapter 4: AC Drive Parameters
DURAPULSE AC Drive User Manual
1st Ed. Rev. D 05/2013
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