Cleveland Motion Controls ULTRA SERIES UNDER PILLOW BLOCK TRANSDUCER UPB1 REV AA - Manual (Page 15)

MAN-70254R EV . AA U LTRA S ERIES U NDER P ILLOW B LOCK T RANSDUCER
P AGE 15 OF 18
3.6 S HAFT E XPANSION
If the roller is subjected to higher temperatures after installation, thermal shaft expansion may damage the
transducers. To prevent damage to the transducers, an expansion type pillow block bearing should be used.
3.7 M OUNTING THE S ENSING R OLL
The following steps take into consideration the risk and difficulty of handling large rolls and help to minimize the
number of failed attempts at mounting the roll.
1. Before mounting the sensing roll, confirm that the transducer body is securely mounted.
2. The pillow block bearings used must be a expansion type to allow for thermal shaft expansion.
3. Follow the pillow block manufactures directions for installation.
4. The pillow block must be mounted flat to the UPB transducer mounting plate and the transducer must be
mounted flat to the machine surface. Refer to flatness specification in Section 3.2. The pair of transducers must
be parallel to each other in all directions. This should be accomplished by machining the surfaces before
mounting the transducers. Do not insert any shims under the pillow block bearing or the UPB transducer to
accomplish this. Inserting shims will induce twisting moments that create erroneous tension measurements.
3.8 C HECKING T HE T RANSDUCER M OUNTING
Before preparing to apply force to the transducer 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 transducer on flat (machined) surface.
•
Shaft length or roll weight 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).
•
The transducer is positioned in the web path so that the wrap angle is not constant.
3.9 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.
•
Polarity changes are accommodated by reversing the orientation of the transducer or by interchanging
the black and white output wires.
Figure 7 illustrates a typical full bridge transducer configuration.