Rockwell Automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 15)

7 Installation
As a general rule, Reliance Electric recommends shielding of all
conductors if:
• wire lengths exceed 4 inches and power and logic leads must be bundled
together*; or
• radiated and/or conducted noise must be minimized due to sconcerns
about immunity or general compliance (CE, FCC, etc.)
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.
*Reliance Electric considers this an unfavorable condition and does not
recommend bundling of power and logic leads for any length.
ATTENTION: If it is not practical to shield power conductors,
Reliance Electric recommends shielding all logic-level leads. If
shielding is not practical, use twisted pair control wiring to minimize
induced electrical noise.
ATTENTION: Under no circumstances should unshielded power and
logic leads be bundled together. Induced voltage can cause
unpredictable behavior any electronic device, including motor controls.
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Shielding guidelines
Use 18-24 AWG wire for speed adjust potentiometer wiring. Use 14–16
AWG wire for AC line (L1, L2) and motor (A1 and A2) wiring.