Rockwell Automation 1305 AC Drive, Series C, Firmware 6.xx and Up - Manual (Page 88)

Programming 5-20
Advanced Setup Group (continued)
[PWM Frequency] Parameter # 45 Factory Default 4.0 kHz [PWM Frequency]
Parameter Type Read & Write Minimum 2.0 kHz
This parameter sets the carrier frequency for the PWM
output waveform.
Important: Output Current derating applies above 4kHz.
See Fig. 5-11.
Important: Changing PWM carrier frequency may result in
changes in Start-up and Holding current if start boost and
DC Holding voltages are in effect. These parameters
should be checked if the carrier frequency is changed and
reprogrammed if needed.
Units 0.1 kHz Maximum 8.0 kHz
Figure 5.11 PWM Frequency Derating
1 2 3 4 5 6 7 8
84
86
88
90
92
94
96
98
100
% Output Current (A)
Carrier Frequency, kHz
Important: Ignoring derating guidelines can
cause reduced drive performance.