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AKD Installation | 8 Electrical Installation8.10 Connection Diagram, AKD-x02406 and AKD-xxxx0780 Kollmorgen | December 2009
AKD Installation | 8 Electrical Installation8.11 EMI Noise Reduction8.11.1 Recommendations for EMI Noise ReductionThe 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. Neverrely on hinges or mounting bolts for ground connections. Provide an electrical connection across theentire back surface of the drive panel. Electrically-conductive panels such as aluminum or galvanizedsteel are preferred. For painted and other coated metal panels, remove all coating behind the drive.• Ensure good ground connection.Connect from cabinet to proper earth ground. Ground leads should be the same gauge as the leads tomain power or one gauge smaller.• Use Kollmorgen cables.Experience has shown that customers who use Kollmorgen’s power and feedback cables have farfewer problems than customers who build cables.Route power and control cables separately, Kollmorgenrecommends a distance of at least 200 mmto improve interference immunity.If a motor power cable is used that includes cores for brake control, the brake control cores must beseparately shielded.• Ground the shielding at both ends.Ground all shielding with large areas (low impedance), with metalized connector housings or shield connectionclamps wherever possible. For cables entering a cabinet, connect shields on all 360° of thecable. Never connect a simple “pigtail.” For more information on shielding concepts, see page 82.• With separate mains filter, maintain separation of leads entering and exiting the mains filter (line powerfilter).Locate the filter as close as possible to the point where the incoming power enters the cabinet. If it isnecessary 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 processingmay be disturbed. Install all feedback cables with an adequate cross-section, per IEC 60204 (see page 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 backshells. Ensure that both shells connectalong the full 360° of the shields. No portion of the cabling should be unshielded. Never divide a cableacross a terminal stripe• 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.• Lines between drives and filters and external brake resistor must be shielded.Install all power cables with an adequate cross-section, as per IEC 60204 (see page 41) and use therequested cable material to reach maximum cable length.Kollmorgen | December 2009 81
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