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Estimating Times and Pulses for Acceleration/Deceleration
Appendix B
Calculate the deceleration start limit using the formulas below when the speed is changed during positioning
with the following condition for the NC Unit (refer to figure 3):
The time from the target speed (400 pps) until operation stops is the set deceleration time of 500 ms.
Deceleration start limit position: The target position will be exceeded if the speed is changed beyond this posi-
tion. The speed cannot be changed at a position beyond this position, and operation will decelerate to a stop.
A) Calculate the deceleration from 400 pps to 0 pps in 500 ms.
Deceleration (pps
2
) = 400 pps/0.5 s = 800 pps
2
B) Calculate time to reach 0 pps from 10,000 pps at this deceleration.
Time (s) = 10,000 pps/pps
2
= 12.5 s = 12,500 ms
C) Calculate the movement required to decelerate from 10,000 pps to 0 pps in this time.
Movement (pulses) =
= 62,500 pps
D) Calculate the deceleration start limit position at which the speed can be changed.
Deceleration start limit position (pulses) = 216,000
−
62,500
= 153,500 pulses
In this case, changing the speed is determined to not be possible because the speed change is attempted in
the proximity of 193,000, which is beyond the deceleration start limit position above.
At a position before 153,500 pulses, however, the speed can be changed as in figure 2.
12.5 s
×
10,000 pps
2
Summary of Contents for CS1W-213 - REV 02-2008
Page 2: ...CS1W NC113 213 413 133 233 433 Position Control Units Operation Manual Revised February 2008 ...
Page 3: ...iv ...
Page 13: ...xiv ...
Page 15: ...xvi ...
Page 19: ...xx ...
Page 43: ...18 Basic Operational Flow Section 2 1 ...
Page 87: ...62 Servo Relay Unit Section 3 7 ...
Page 199: ...174 Z phase Margin Section 6 8 ...
Page 217: ...192 Sample Program Section 7 7 ...
Page 285: ...260 Easy Backup Function Ver 2 0 or later Section 9 11 ...
Page 377: ...352 Common Parameter Area Appendix C ...