LEESON Chassis Mount SCR Control - Manual (Page 18)

12 Installation SPEEDMASTER™ OPERATION MANUAL
Shielding guidelines
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.
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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 logic
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 shielded cable. If noise
is produced by devices other than the drive, 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,
it may be necessary to add AC line filtering devices, or to 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.