LEESON PWM DC Control: 174299 - Manual (Page 9)

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As a general rule, Leeson recommends shielding of all conductors.
If it is not practical to shield power conductors, Leeson recommends shielding all logic-level leads. If
shielding of logic level leads is not practical, the user should twist all logic leads with themselves to
minimize induced noise.
It may be necessary to earth ground the shield at the drive end. If noise is generated by a device on
the drive, ground the shield at the end away from the drive. Do not ground both ends of the shield.
If the drive continues to pick up noise after grounding the shield then mount the drive in a less noisy
environment.
Logic wires from other input devices, such as motion controllers and PLL velocity controllers, must be
separated from power lines in the same manner as the logic I/O on this drive.
Shielding guidelines
m
WARNING
Under no circumstances should power and logic leads be bundled together. Induced voltage
can cause unpredictable behavior in any electronic device, including motor controls.