9.7 EMI Noise Reduction
CAUTION
Electromagnetic Fields!
Electromagnetic radiation may, by acting on electrically conductive mater-
ials, lead to potential hazardous danger (warming, loss 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.
9.7.1 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 or one gauge smaller.
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 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 (
# 42) 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, 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 (
42) and use the requested cable material to reach maximum cable length.
AKD Installation | 9 Electrical Installation
Kollmorgen | kdn.kollmorgen.com | October 2017
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