Intelligent Technologies QCPort System Install Manual
November 2005
MN05001002E For more information visit
www.eatonelectrical.com
Page
18
Guidelines for Supplying Power
Use the following guidelines to protect your devices and achieve the best results when
supplying power to the QCPort interconnect system.
IT. Power Supplies
The IT. family of products includes power supplies that meet the needs of the QCPort
devices and motor control. The same power supply that is used for the IT. motor
controller line is applicable to the QCPort system.
Other Power Supplies
When 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 limits
respectively.
• Use a power supply that has its own current limit protection.
• Make sure you derate the supply for temperature using the manufacturer’s
guidelines.
• Provide fuse protection for each segment of the cable system; any section
leading away from a power supply must have protection (can be part of the
power tap).
Power Ratings
The 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.
Notice Check your national and local codes for additional information. In the United States
and Canada, the QCPort cable system must be installed as a Class 2 circuit. This
requires limiting the current to 4 A.
QCPort Interconnect Cable Rating
The QCPort Interconnect rating is 1.0 A, but the allowable current depends on the length
of the run. The maximum current decreases as the QCPort Interconnect cable length
increases, as indicated in the table below.