Maintenance Technology April 2017 - 40

POWER TRANSMISSION

Prevent
Cable
Failure in
Dynamic-Cable
Tracks
CABLE FAILURE within a dynamic-cable track can lead to
costly, yet, in most cases, easily avoided, downtime. David
Smith of U.S. Tsubaki Power Transmission LLC
(Wheeling, IL, ustsubaki.com) points to
several important considerations for
maximizing the performance life of cables
running through your plant's powertransmission-equipment systems.
Paying attention to these details can help you reduce the risk of unexpected and costly downtime.
- Jane Alexander, Managing Editor

Proper cable selection
Incorrect cable designs are often installed in a dynamic-cable track. Given
the high rates of motion and speed under which cable tracks perform, be sure
to select and install a cable specifically
designed to operate in your particular
environment or application.
Proper cable-track sizing
To achieve maximum life from your
cables, assure ample amounts of free
space within the cable track. At a minimum, cables should have 10% free space
around them, with a maximum fill rate
within the cable track not to exceed
60%. As the speed and cycle rates of a
cable track increase, the cables must
have adequate space to operate properly.
It is also imperative for the cable track
to have the proper bend radius. Dynamic cables are generally designed to
operate with a bend radius that's greater
than 7.5 times the outside diameter of
the cable. A tighter radius will reduce
the performance life of your cables.

40 |

MAINTENANCE TECHNOLOGY

Strain relief
Every cable requires effective strain
relief as it enters and exits the cable
track. This strain relief ensures that
proper cable length remains within the
track as it cycles back and forth. Insufficient strain relief is one of the most
commonly overlooked considerations
during cable installation.
Proper strain relief often can be
accomplished by simply zip-tying the
cables to the strain-relief fingers that
have been molded into the cable-track
brackets.
Internal vertical dividers
Another often-overlooked consideration involves the use of internal
dividers within the cable track. Vertical
dividers between the cables ensure that
each cable is confined to its proper location and spacing within the track and
is unable to cross over or "tangle," with
the other cables. Keeping your cables in
proper alignment will help extend their
performance.

Cable-carrier material selection
Even with proper strain relief, relative
motion between the cables and cable
carrier crossbars can result in some
scuffing of the cable jackets. By selecting
a crossbar design/material that best
interacts with the cable jacket material, you can reduce or eliminate that
scuffing.
For example, a nylon cable track with
aluminum crossbars is much friendlier
to the PVC jackets of most electrical
cables than a standard glass-fiber nylon
cross bar. MT

David Smith is director of
sales for the Milwaukeebased KabelSchlepp
Division of U.S. Tsubaki Power
Transmission LLC. For more information on dynamic-cable tracks and
other power-transmission topics, visit
ustsubaki.com.
APRIL 2017


http://www.ustsubaki.com http://www.ustsubaki.com

Table of Contents for the Digital Edition of Maintenance Technology April 2017

Maintenance Technology April 2017 - 1
Maintenance Technology April 2017 - Cover1
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