TR-Electronic CDV582 - Page 113

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11/21/2019 TR - ECE - BA - GB - 0139 - 02 Page 113 of 154
Preferably for linear axes (forward and backward motion):
The parameter Revolutions denominator can be programmed as a fixed value of “1” for linear
axes. The parameter Revolutions numerator is programmed slightly higher than the required
number of revolutions. This ensures that the measuring system does not generate an actual value
jump (zero transition) if the travel is slightly exceeded. For the sake of simplicity, the full revolution
range of the measuring system can also be programmed.
The following example serves to illustrate the approach.
Given:
● Measuring system with 4096 steps/rev. and max. 4096 revolutions
● Resolution 1/100 mm
● Make sure that the measuring system is programmed in its full resolution and measuring range
(4096x4096):
Measuring range in steps = 16777216,
Revolutions numerator = 4096
Denominator revolutions = 1
Set the mechanics to be measured to the left stop position
● Set measuring system to "0" by adjustment
● Set the mechanics to be measured to the end position
● Measure the mechanical distance covered in mm
● Read off the actual position of the measuring system on the connected control
Assumption:
● Distance covered = 2000 mm
● Measuring system actual position after 2000 mm = 607682 steps
Consequently:
Number of revolutions covered = 607682 steps / 4096 steps/rev.
= 148.3598633 revolutions
Number of mm/revolution = 2000 mm/148.3598633 revs. = 13.48073499 mm/rev.
For a resolution of 1/100 mm, this equates to 1348.073499 steps/revolution
required programming:
Number of numerator revolutions = 4096
Number of denominator revolutions = 1
Measuring range in steps = number of steps per revolution *
Number of numerator revolutions
Number of denominator revolutions
= 1348.073499 steps / rev. *
4096 numerator revolutions
1 denominator revolution
= 5521709 steps (rounded)