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Manual – IPOSplus®
277
20
Setting the user travel units
Assembler – Introduction
Travel distance
factor NUMERA-
TOR
Number of increments the motor moves to travel a defined distance.
Setting range: 0 .....
1
..... 2
31
- 1
Travel distance
factor DENOMINA-
TOR
Defined travel distance in user travel units.
Setting range: 0 .....
1
..... 2
31
- 1
Example
12376 increments correspond to 120 mm. NUMERATOR = 12376, DENOMINATOR =
120, UNIT = mm.
Example
The following three examples will demonstrate how the travel factors numerator/denom-
inator of a linear unit are set for position specification:
• Example A: Position specification in mm for the linear axis
• Example B: Position specification in increments
• Example C: Position specification in output revolutions
Mechanical structure of the linear unit
Example A: mm
The defined distance to be calculated is one revolution of the driven gear.
• Travel distance factor NUMERATOR = Increments/motor revolution × gear ratio i =
4096 × 4 = 16384
• Travel distance factor DENOMINATOR = Output diameter ×
π
= 314.15926
The travel distance factor DENOMINATOR is not a whole number, so the accuracy of
the conversion can be increased by using an expansion factor. The expansion factor
should be as high as possible, however, the result must not exceed the setting range
(expansion factor e.g. 100 000).
• Travel distance factor NUMERATOR = 16384 × 100000 = 1638400000
• Travel distance factor DENOMINATOR = 314.15926 × 100000 = 31415926
INFORMATION
If the numerator or denominator are non-integer values, the conversion can be made
more accurate if both numerator and denominator are multiplied by the same expan-
sion factor (e.g. 10, 100, 1000, etc.). Doing so will not limit the travel range.
511398411
d =
100
mm
M
i = 4
x
[mm]
INFORMATION
Since
π
is not a finite number, the target position specification will always contain er-
rors.
P
i
f
kVA
Hz
n
P
i
f
kVA
Hz
n