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Lessen servo amplifier-sourced noise

Posted: 04 Sep 2008     Print Version  Bookmark and Share

Keywords:servo amplifier  noise reduction  shield connections  servo motor 

Motor power cables don't just couple noise currents into adjacent cables: they inject unwanted noise currents into all conducting surfaces, including the machine frame. Machine-frame currents travel the path of least impedance, which can create insidious and difficult-to-diagnose equipment malfunctions.

Key to noise reduction is proper care in handling shield connections. Make sure the shield encloses the maximum possible amount of signal wiring.

Although the motion-system designer can't change servo amplifier rise rate, noise can be minimised by keeping motor power cables short, shielded, and properly terminated. Select a servo motor that segregates power and encoder cables. Use an edge filter in very noise-sensitive applications.

Servo amplifiers are inherently noise producers. Noise is minimised by separating signal cables from power cables, and by using shielded cables for both.

View the PDF document for more information.

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