Publication 1763-RM001C-EN-P - October 2009
Using High-Speed Outputs 143
In this example, the maximum value that could be used for accelerate/
decelerate is 6000, because if both accelerate and decelerate are 6000, the
total number of pulses = 12,000. The run component would be zero. This
profile would consist of an acceleration phase from 0 to 6000. At 6000, the
output frequency (OF variable) is generated and immediately enters the
deceleration phase, 6000 to 12,000. At 12,000, the PTO operation would
stop (output frequency = 0).
If you need to determine the ramp period (accelerate/decelerate ramp
duration):
• 2 x ADP/OF = duration in seconds (OF = output frequency)
The following formulas can be used to calculate the maximum frequency
limit for both profiles. The maximum frequency = the integer which is less
than or equal to the result found below (OF = output frequency):
• For Trapezoid Profiles: [OF x (OF/4)] + 0.5
• For S-Curve Profiles: 0.999 x OF x SQRT(OF/6)
Accel Run Decel
6,000 0 6,000
Accel Run Decel
12,000
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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