Cleveland Motion Controls Classic Series DIN Rail Amplifier Non-Isolated MWI-13466 REV CA - Manual (Page 20)

C LASSIC S ERIES N ON -I SOLATED A MPLIFIER MAN-13466 R EV CA
P AGE 20 OF 26
3.6 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 you the correct and incorrect techniques to use when applying calibration forces.
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.
Examples of Inaccurate Wrap Angles
In this example, the anchor
point and the wrap angle
have been correctly
determined!
Example of Correct Wrap angles and Anchor Point