Eaton Electrical MN05001002E Manual De Usuario

 

Intelligent Technologies QCPort System Install Manual 

November 2005  

 

MN05001002E 

For more information visit 

www.eatonelectrical.com

  

Page 

21

 

It is important to verify that the power supply is properly sized for the load and the length 
of the QCPort system.  To calculate if the placement and the size of the power supplies 
are adequate, refer to the examples in the Using the Sizing Calculation on page 23.  

Follow these guidelines to protect your nodes and to achieve the best results when 
supplying power to the QCPort cable system. 

•  Use power supplies rated at 24V. 

•  Select a power supply that provides sufficient current for all attached nodes. 

•  Make sure you derate the power tap and the power supply for the expected 

temperature using the manufacturer’s guidelines. 

•  Use a power supply that has its own current limit protection. 

When the sections have a voltage drop less than 4.65V, your configuration will operate 
properly.  Ideally, the voltage drops for each section should be within 10%.  If one section 
has a substantially greater voltage drop than the other, you should attempt to balance the 
load of the cable system by moving the power supply or nodes.  Some ways to make 
your system operational include the following: 

•  Shorten the overall length of the cable system. 

•  Move the power supply in the direction of the overloaded section. 

•  Move devices from the overloaded section to another section. 

•  Move higher current loads as close to the supply as possible. 

•  Add a second power supply to the cable system. 

•  Break the QCPort system into two separate networks to reduce the number of 

nodes on each.