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APEX615n Installation Guide
Defeating Noise
The best time to handle electrical noise problems is before they occur. When a motion system
is in the design process, the designer should consider the following set of guidelines for
system wiring (in order of importance):
1. Put surge suppression components on all electrical coils: Resistor/capacitor filters,
MOVs, Zener and clamping diodes.
2. Shield all remote connections, use twisted pairs. Shields should be tied to Earth at one
end.
3. Put all microelectronic components in an enclosure. Keep noisy devices outside. Watch
internal temperature.
4. Ground signal common wiring at one point. Float this ground from Earth if possible.
5. Tie all mechanical grounds to Earth at one point. Run chassis and motor grounds to
the frame, and the frame to Earth.
6. Isolate remote signals. Solid state relays or opto isolators are recommended.
7. Filter the power line. Use common RF filters, and use an isolation transformer for
worst case.
8. Filter the lines between the drive output and the motor.
A noise problem must be identified before it can be solved. The obvious way to approach a
problem situation is to eliminate potential noise sources until the symptoms disappear, as in
the case of ground loops. When this is not practical, use the above guidelines to shotgun the
installation.
References
Information about the equipment referred to may be obtained by calling the numbers listed
below.
• Corcom line filters, (214) 386-5515
• Opto-22 optically isolated relays, (408) 496-6611
• Crydom optically isolated relays, (415) 463-2250
• Potter Brumfield optically isolated relays, (812) 386-1000
• Teal power line isolation filters, (800) 888-8325
SCHAFFNER EMC, Inc. SCHAFFNER EMC, Inc.
12 Hughes St. 9B Fadem Road
Suite D-106 Springfield, NJ 07081
Irvine, CA 91718-1901
Phone: 714-457-9400 Phone: 201-379-7778
Fax: 714-457-9510 Fax: 201-379-1151
Kam Electronics (Stocking Distributor)
400 Boren Ave. North
Seattle, WA 98109
Phone: 206-382-1300
Fax: 206-382-0186
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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