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4. PARAMETERS FOR POSITIONING CONTROL
4.2.1
Setting the number of pulses per revolution / travel value per revolution / unit magnification
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This section explains how to set the number of pulses per revolution, the travel
value per revolution, and the unit magnification.
(1) Setting method 1
(a) Finding the smallest position resolution (∆l).
The smallest position resolution (∆l) is determined by the travel value per
revolution (∆S) and the number of encoder feedback pulses (P
∆l =
(b) Finding the unit magnification (A
Find the unit magnification on the basis of ∆l determined as described in (a)
above. However, make sure that the smallest command unit is not smaller
than ∆l.
∆ ∆ ∆ ∆ l found in (a) [mm]
0.00001 < ∆l ≤ 0.0001
0.0001 < ∆l ≤ 0.001
0.001 < ∆l ≤ 0.01
0.01 < ∆l ≤ 0.1
[Example] Assuming that the travel value per revolution (∆S) is 10 [mm] and the
number of encoder feedback pulses (P
∆l =
This means that the smallest command unit is 0.01 [mm] and the unit
magnification (A
Therefore, 0.01 [mm] units can be specified in commands.
(c) Finding the travel value per revolution (A
If the unit magnification (A
value of A
"1", the travel value per revolution is the product of A
[Example] Assume that the travel value per revolution is 10 [mm] and the unit
magnification is 10:
A
=
L
Accordingly, 100.0 [ µ m] is set as the travel value per revolution (A
case.
(d) Number of pulses per revolution (A
Set the number of feedback pulses per revolution of the encoder.
search engine
∆S
P
f
)
M
Smallest Command Unit [mm]
0.0001
0.001
0.01
0.1
10 [mm]
= 0.00122 → 0.001 < 0.00122 ≤ 0.01
8192 [PLS/rev]
) is 100.
M
) is "1", the travel value per revolution is the
M
, unchanged. If the unit magnification (A
L
10000.0 [ µ m]
= 100.0 [ µ m]
100
P
4 − 3
(For unit setting [mm] )
Unit Magnification (A
100
1000
) is 8192 [PLS/rev]:
f
).
L
) is a value other than
M
and A
.
L
M
)
).
f
)
M
1
10
) in this
L
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