8.4 EMI Noise Reduction
Electromagnetic Fields!
Electromagnetic radiation may, by acting on electrically conductive materials, lead to poten-
tial hazardous danger (warming, failure of implants).
Work on the electrical installation may only be performed by trained and qualified per-
sonnel, 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.
8.4.1 Recommendations for EMI noise reduction
The following guidelines will help you to reduce problems with electrical noise in your applic-
ation.
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, but must cover the regional
legal requirements, example (
Use Kollmorgen cables.
Route power and control cables separately, Kollmorgen recom-
mends a distance of at least 200 mm to improve interference immunity.
Ground the shielding at both ends.
Ground all shielding with large areas (low imped-
ance), with metalized connector housings or shield connection clamps wherever pos-
sible. 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 and Hybrid Cables may not be extended, since the shielding
would be interrupted and the signal processing may be disturbed.
Install all feed-
back cables with an adequate cross-section, per IEC 60204 (
# 52) and use the reques-
ted 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, con-
necting 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 (
# 52) and use
the requested cable material to reach maximum cable length.
AKD2G-S Installation, Safety 1 | 8 Electrical Installation
Kollmorgen | kdn.kollmorgen.com | Beta, December 2018
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