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9-3
Section
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In this mode, if deceleration has not ended when the origin proximity signal has
turned OFF, positioning is stopped by the origin signal input after deceleration
has ended. If the deceleration period is short for some reason (such as starting
inside the origin proximity area), the Position Control Unit will detect another ori-
gin signal. Therefore, be sure that the origin proximity signal period is long
enough, i.e., at least as long as the deceleration period.
Origin proximity
signal
Origin signal
Pulse output
1
0
1
0
CCW
CCW
Ideal position for origin proximity
signal to turn OFF
Positioning axis
Pulse output
TD
VL
VH
CW
Positioning axis
CW
Positioning axis
CW
CCW
ORIGIN SEARCH (Start)
Origin (Stop)
ORIGIN SEARCH (Start)
P
D
A general method for calculating the number of pulses within the deceleration
interval is presented below.
Deceleration time T
D
= V
H
-- V
L
/1000 x R,
where R: deceleration data (pps/1 ms);
Number of pulses P
D
for deceleration period = (V
H
+ V
L
) x T
D
/2
= V
H2
-- V
L2
/2000 x R.
If V
H
= 20000 pps, V
L
= 1000 pps, and R = 1000 pps/ms,
then P
D
= 20000
2
-- 1000
2
/2000 x 100 = 1995.
Therefore, approximately 2,000 pulses are required for deceleration.
Содержание SYSMAC C500-NC113
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