Chapter 4 Parameters
VFD-EL-W
4-37
Therefore, the motor’s operation distance after executing the stop command = number of revolutions x
circumference = 175 x 2 πr. It also menas that the swivel table goes back to the top after 175 revolutions.
Example 2
Assume that the motor swivel table rotates at 1.5 Hz, and Pr.01.22 = 10 Hz [Simple Positioning Stop Frequency 2],
and Pr.01.30 = 10 sec. [Delay Time of Simple Positioning Stop 2], then the deceleration time from 60 Hz to 0 Hz is
40 seconds.
The delay time at stop for 1.5 Hz is 1.5 second; the deceleration time from 1.5 Hz to 0 Hz is 1 second.
After executing the stop command, Simple Positioning Stop activates, its rotation speed is
n = 120 x 1.5 / 4 (revolution / minute) = 1.5 / 2 (revolution / second)
The number of revolution of the swivel table = (1.5 / 2 x (1.5 + 2.5)) / 2 = 1.5 (revolutions)
Therefore, the motor’s operation distance after executing the stop command = number of revolutions x
circumference = 1.5 x 2 πr. It also means the swivel table stops after running 1.5 revolutions.
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