Cleveland Motion Controls ULTRA ISC SERIES SLIM CELL TRANSDUCER REV AA - Manual (Page 35)

MAN-70434-0 R EV AA U LTRA ISC S ERIES S LIM C ELL T RANSDUCER
4.12 P ROPER P RACTICES FOR A PPLYING C ALIBRATION F ORCES
Seldom is a transducer oriented such that the calibration can be done by simply hanging a true
dead weight from the roll. By generating a tension force that follows the same web path across the
roll, you avoid the necessity of making manual (numerical) calculations to correct for the details of
different wrap angle, transducer orientation, etc.
The following diagrams show the correct and incorrect techniques to use when applying
calibration forces.
Examples of Inaccurate Wrap Angles
In this example, there was a disregard for maintaining the
correct wrap angle. The dotted line indicates the proper
web path.
In this example, the true web path was difficult to access
and an incorrect path was implemented using a
convenient, but incorrect anchor point.
Example of Correct Wrap angles and Anchor Point
In this example, the anchor point and the wrap angle have
been correctly achieved and closely follow the actual web
path.
P AGE 35 OF 42