Parameterization and configuration
Printed in the Federal Republic of Germany
©
TR-Electronic GmbH 1998, All Rights Reserved
03/09/2010
TR - ECE - BA - GB - 0014 - 03
Page 25 of 31
Formula for gearbox calculation:
Number of Revolutions Numerator
Total Number of Steps = Measuring units per revolution *
Number of Revolutions Denominator
If it is not possible to enter parameter data in the permitted ranges of numerator and
denominator, the attempt must be made to reduce these accordingly. If this is not
possible, it may only be possible to represent the decimal number affected
approximately. The resulting minor inaccuracy accumulates for real round axis
applications (infinite applications with motion in one direction).
A solution is e.g. to perform adjustment after each revolution or to adapt the
mechanics or gearbox accordingly.
The parameter
"Measuring units per revolution"
may also be decimal number,
however the
"Total Number of Steps"
may not. The result of the above formula must
be rounded up or down. The resulting error is distributed over the total number of
revolutions programmed and is therefore negligible.
Preferably for linear axes (forward and backward motions):
The parameter
"Revolutions Denominator"
can be programmed as a fixed value of
"1". The parameter
"Revolutions Numerator"
is programmed slightly higher than the
required number of revolutions. This ensures that the measuring system does not
generate a jump in the actual value (zero transition) if the distance travelled is
exceeded. To simplify matters the complete 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
-
Ensure the measuring system is programmed in its full resolution and total
measuring length (4096x4096):
Total Number of Steps
= 16777216,
Revolutions Numerator
= 4096
Revolutions Denominator
= 1
Set the mechanics to be measured to the left stop position
-
Set measuring system to "0" using the adjustment
-
Set the mechanics to be measured to the end position
-
Measure the mechanical distance covered in mm
-
Read off the actual value of the measuring system from the controller
connected
