Cleveland Motion Controls ULTRA SERIES SLIM CELL TRANSDUCER REV AA - Manual (Page 14)

U LTRA S ERIES S LIM C ELL T RANSDUCER AO-70263 R EV AA
P AGE 14 OF 18
3.4 M OUNTING THE 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 1.1.
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 Figure
2 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.
3.5 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.
3.6 E
LECTRICAL
C
ONNECTIONS AND
W
IRING
Refer to the installation wiring diagrams supplied with the Cleveland-Kidder tension indicator or controller for
making the transducer to amplifier connections. Make certain that:
• The cables do not interfere with the web path, and that they are away from gearing or
other moving parts.
• You exercise care when routing the cables to avoid pick-up from noise-radiating power
cabling (motor armature leads, AC main wiring, etc).
• In environments with severe electromagnetic noise, it may be necessary to route the
cables inside metallic conduit.
• You accommodate polarity changes by reversing the orientation of the Slim Cell or by
interchanging the black and white output wires.