236 Kollmorgen - December 2011
MMC Smart Drive Hardware Manual - MOTOR CABLES & CONNECTORS
Doubling the minimum bending radius for reeling applications can triple cable life at
the maximum recommended tension. Therefore, the largest possible bending radius
should be used to increase cable life.
9.1.2 Cable Tension
Cable tension plays an extremely important role in determining cable life in reeling.
The copper conductors are the principle strength member in flexible cable
constructions. Even if strain relief fittings are used on the cable ends, most of the
tension will still be supported by the copper conductors.
The effects of tension on a cable are dependent upon the pounds per cross-sectional
area of the copper conductors. Larger AWG wires and/or more conductors can handle
more tension than smaller AWG wires and/or fewer conductors.
9.2 Flex Cable Installation
Cables should be fixed on both ends to relieve them of tensile loads and prevent any
loads from being applied to the molded connectors. At a minimum, the cables have to
be fixed on the moving end of the track. A distance of 3 to 6 inches from the track to
the fixation point is recommended (See Figure 9-1).
Figure 9-1: Flex Cable Installation
Observe the following precautions when installing flex cables:
WARNING: CABLE DAMAGE
Failure to properly isolate Flex, Pull, and Torsional forces from the connector
ends will result in electrical and mechanical breakdown. Over clamping at the
fixation point can result in cable damage.
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