PACMotion™ PSD Installation and User Manual
Section 5
GFK-3168A
September 2020
Mechanical Installation
64
5.9
EMI Noise Reduction
CAUTION
Electromagnetic Fields!
Electromagnetic radiation may, by acting on electrically conductive materials, lead to potential
hazardous danger (warming, failure of implants).
Work on the electrical installation may only be performed by trained and qualified personnel, in
compliance with the regulations for safety at work, and only with switched off mains supply, and
secured against restart.
Grounding, equipotential bonding and radiation-reducing shields may not be removed.
5.9.1
Recommendations for EMI noise reduction
The following guidelines will help you to reduce problems with electrical noise in your application.
Ensure good connections between the cabinet components. Connect the back panel and cabinet
door to the cabinet body using several conductive braids. Never rely on hinges or mounting bolts
for ground connections.
Ensure good ground connection. Connect from cabinet to proper earth ground. Ground leads
should be the same gauge as the leads to main power or one gauge smaller.
Use Emerson cables. Route power and control cables separately, Emerson recommends a distance
of at least 200 mm to improve interference immunity.
Ground the shielding at both ends. Ground all shielding with large areas (low impedence), with
metalized connector housings or shield connection clamps wherever possible. For cables entering a
cabinet, connect shields on all 360° of the cable. Never
connect a simple “pigtail.” For more
information on shielding concepts, (
With separate mains filter, maintain separation of leads entering and exiting the mains filter (line
power filter). Locate the filter as close as possible to the point where the incoming power enters the
cabinet. If it is necessary for input power and motor leads to cross, cross them at 90°.
Feedback lines may not be extended, since the shielding would be interrupted and the signal
processing may be disturbed. Install all feedback cables with an adequate cross-section, per IEC
60204 (
# 41) and use the requested cable material to reach maximum cable length.
Splice cables properly. If you need to divide cables, use connectors with metal back- shells. Ensure
that both shells connect along the full 360° of the shields.
Use differential inputs for analog signals. Noise susceptibility in analog signals is greatly reduced by
using differential inputs. Use twisted-pair, shielded signal lines, connecting shields on both ends.
Cables between drives and filters or external regen resistors must be shielded. Install all power
cables with an adequate cross-section, per IEC 60204 (
#41) and use the requested cable
material to reach maximum cable length.
