A442, A443, Advanced program group (continued) – Rockwell Automation 25B PowerFlex 520-Series Adjustable Frequency AC Drive User Manual User Manual
Page 111: Important
Rockwell Automation Publication 520-UM001G-EN-E - September 2014
111
Programming and Parameters
Chapter 3
Advanced Program Group (continued)
A440 [PWM Frequency]
Related Parameter(s):
A540
Sets the carrier frequency for the PWM output waveform. The chart below provides derating guidelines based on the PWM frequency setting.
Values
Default:
4.0 kHz
Min/Max:
2.0/16.0 kHz
Display:
0.1 kHz
% Output Curent (A)
68
84
88
80
76
96
100
92
72
64
60
56
50
Carrier Frequency (kHz)
8
7
6
5
4
3
2
1
15
14
16
13
12
11
10
9
IMPORTANT
Ignoring derating guidelines can cause reduced drive performance. The drive may automatically reduce the PWM carrier frequency at low output speeds,
unless prevented from doing so by A540 [Var PWM Disable].
A441 [Droop Hertz@ FLA]
PowerFlex 525 only.
Reduces the frequency based on current. This frequency is subtracted from the commanded output frequency. Generally Slip and Droop would not both be used, but if both are enabled
they simply subtract from each other. Typically used in load sharing schemes.
Values
Default:
0.0 Hz
Min/Max:
0.0/10.0 Hz
Display:
0.1 Hz
PF 525
A442 [Accel Time 2]
Time for the drive to ramp from 0.0 Hz to
[Maximum Freq] if Accel Time 2 is selected.
Accel Rate = [Maximum Freq] / [Accel Time]
Values
Default:
10.00 s
Min/Max:
0.00/600.00 s
Display:
0.01 s
Speed
0
Time
[Maximum Freq]
[Accel Time x]
[Decel Time x]
0
Acceleration
Deceleration
A443 [Decel Time 2]
Time for the drive to ramp from
[Maximum Freq] to 0.0 Hz if Decel Time 2 is selected.
Decel Rate = [Maximum Freq] / [Decel Time]
Values
Default:
10.00 s
Min/Max:
0.00/600.00 s
Display:
0.01 s