Eaton Cutler Hammer MN05001002E Installation Manual

Intelligent Technologies QCPort System Install ManualNovember 2005MN05001002E For more information visit www.eatonelectrical.com Page 18Planning a QCPort Interconnect SystemGuidelines for Supplying PowerUse the following guidelines to protect your devices and achieve the best results whensupplying power to the QCPort interconnect system.IT. Power SuppliesThe IT. family of products includes power supplies that meet the needs of the QCPortdevices and motor control. The same power supply that is used for the IT. motorcontroller line is applicable to the QCPort system.Other Power SuppliesWhen selecting a power supply from another vendor, use the following guidelines:• Use power supplies rated at 24V• Select a power supply that provides sufficient current for all attached nodes.Note: In the U.S. and Canada, be sure to adhere to NEC and CE Code limitsrespectively.• Use a power supply that has its own current limit protection.• Make sure you derate the supply for temperature using the manufacturer’sguidelines.• Provide fuse protection for each segment of the cable system; any sectionleading away from a power supply must have protection (can be part of thepower tap).Power RatingsThe power capabilities of the QCPort interconnect system include:• Power supplies rated at 24V DC.• Long Run cables rated for 4 A steady state.• Interconnect Cables rated for 1.0 A steady state.• Backplane rated for 6 A steady state.NoticeCheck your national and local codes for additional information. In the United Statesand Canada, the QCPort cable system must be installed as a Class 2 circuit. Thisrequires limiting the current to 4 A.QCPort Interconnect Cable RatingThe QCPort Interconnect rating is 1.0 A, but the allowable current depends on the lengthof the run. The maximum current decreases as the QCPort Interconnect cable lengthincreases, as indicated in the table below.