Cleveland Motion Controls ULTRA ISC SERIES SLIM CELL TRANSDUCER REV AA - Manual (Page 32)

U LTRA ISC S ERIES S LIM C ELL T RANSDUCER MAN-70434-0 R EV AA
4.7 M OUNTING THE S ENSING R OLL
Be sure to exercise care during this portion of the installation, as it easy to produce excessive force on the
transducer sensing beams. To mount the roll, use the following steps:
1. Loosely fit the roll into the transducer to verify that the shaft and the adapter fit without excessive
interference or clearance. For reference, the bore diameter of the hub is +0.0007 and +0.0017 in.
(+0.018 and +0.043 mm) from the nominal diameters listed in Section 4.2.3 .
2 Check to see if the transducer has a blank back plate (without a hole). If it is a blank plate, be sure that
the roll shaft does not extend too deep inside of the Load Cell and rub against the back plate. Refer to
letter N in Section 4.2.3 of this document.
3 Secure one end of the roll shaft into either of the Slim Cell Transducer shaft hubs by tightening the two
set screws.
4 Tighten the set screws while preloading the hub.
Preloading of the adapter shaft hub allows for expansion and contraction of the roll shaft. Because of
the affects of thermal gradients and differing material, both expansion and contraction must be
accommodated.
To preload the hub, push the hub inward against the resistance of the internal spring prior to tightening
the set screw on the remaining shaft hub.
During final assembly, you can use Loctite ® #609 retaining compound on the roll journal to
transducer hub interface, and Loctite’s #242 (removable strength) thread locker on the set screws.
4.8 C HECKING T HE T RANSDUCER M OUNTING
Before preparing to apply force to the transducer(s) and calibrating the amplifier, inspect the load cell to
confirm that it is oriented and mounted in accordance to the installation instructions. Common problems
include:
 Failure to mount transducers on flat (machined) surface.
 Poor shaft alignment that exceeds allowable limits.
 Fastener torque either excessive or insufficient.
 Transducer mis-oriented so that the axis of sensing is not true to the applied force vector
(bisector of the wrap angle).
 Roll is mounted without allowance for shaft expansion/contraction at transducer hub.
 The transducer is positioned in the web path so that the wrap angle is not constant.
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