Rockwell Automation Publication 520-UM001A-EN-E - February 2013 101
Programming and Parameters Chapter 3
Advanced Program Group (continued)
A439 [S Curve %]
Enables a fixed shape S-Curve that is applied to the acceleration and deceleration ramps (including jog).
S-Curve Time = (Accel or Decel Time) x (S-Curve Setting in percentage)
Values Default: 0%
Min/Max: 0/100%
Display: 1%
S-Curve Time
Total Time to Accelerate = Accel Time + S-Curve Time
50% S-Curve
Target
vel
Target
vel/2
S-Curve Time = Accel Time
Total Time to Accelerate = Accel Time + S-Curve Time
100% S-Curve
Target
vel
Example:
Accel Time = 10 s
S-Curve Setting = 30%
S-Curve Time = 10 x 0.3 = 3 s
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
54321
15
14
1613
1211109
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]
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
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