Electrical Noise; Emi/Rfi; Recommended Tools And Test Equipment - Motion Control Engineering Motion 4000 Manual

Installation

Electrical Noise

Electrical noise readily occurs when two wires run along side one another with one of them a
high power conductor and the other a low signal level conductor. The easiest way to avoid noise
problems is to keep low-level wiring in separate conduit from high power wiring. If high and
low power wiring must be run in the same duct, separate them by a minimum of three to four
inches. If one must cross the other, it should be at a ninety degree angle.
Alternately, low level wiring may use shielded cable. The shield drains induced voltage to
ground. The shield must be connected to ground at one end only.

EMI/RFI

To avoid EMI/RFI interference:
• Keep motor leads as short as possible. Run them in a separate conduit.
• Run main line supply leads to the controller or isolation transformer in a separate conduit.
• Run leads from the isolation transformer to the drive cabinet in a separate conduit.
• The controller door will protect against interference only when closed.

Recommended Tools and Test Equipment

Recommended tools and test equipment:
• Digital multimeter, Fluke series 75, 76, 77 or equivalent
• Hand-held tachometer
• Clamp-on AC ammeter
• Hand-held radios
• Test weights
2-4 Manual # 42-02-2P24