Mitsubishi Electric MELSEC Q Series User Manual page 175

10 FUNCTION DETAILS
(2) Setting example when the gear's value is outside the settable range
(a) Machine specification
Ball screw lead
Reduction ratio
Encoder resolution : Pt = 262144[PLS/rev]
AP Pt
AL = S = n × Pb =
19660.8
=
125
When the electronic gear's value is outside the settable range or contains a
decimal point, calculate the denominator and numerator according to the
following procedure.
<Procedure for setting the numerator and denominator>
The calculated value after reduction must be as close as possible to the
origial value.
1) Reduce both the numerator and denominator to as small an integer as
possible. In thsi case, the minimum integer value is found by reducing
the denominator and numerator by 16.
2) Regarding the numerator and dinominator, one must be a true integer
and the othr should be rounded off to an integer. Both must be a value
equal to or less than 32768.
a) Calculated value without reduction
Divide using simple division and keep the remainder after the
decimal point.
262144
AP
=
AL 1
6 × 10000
b) Result of reduction when AL is chosen to be the true integer.
Reduce the denominator (AL) to an integer, and keep the
remainder after the decimal point.
AP 32768 × 3
AL =
c) Result of reduction when AP is chosen to be the true integer
Reduce the numerator (AP) to an integer, and keep the remainder
after the decimal point.
AP 32768 × 3
AL =
: Pb = 10[mm] = 10000[μm]
: n = 1/6
262144 × 6
Pt 262144
=
1
6 × 10000
19660
125
262144 × 6
= =
10000
32768 × 3
5
= =
625 625
5
32768 × 3
3
= =
625 625
3
10 - 4
16
32768 × 3
=
10000 625
16
262144 × 6
16
32768 × 3
=
10000 625
16
19660.8 19660
125 = 157.2800
125
32768 32768
208 = 157.5384
208.333
MELSEC-Q
32768 × 3
5
=
625
5
= 157.2864