Eaton Cutler Hammer MN05001002E Installation Manual

Intelligent Technologies QCPort System Install ManualNovember 2005MN05001002E For more information visit www.eatonelectrical.com Page 23Using the Sizing CalculationThe following examples use the sizing calculation to determine if the power supply isplaced correctly in the system and if the power supply is large enough for the application.Example 1 End Connected Power Supply1. Sum up all the currents (QCPort Interconnect system)=0.1 + 1.1 + 0.3 = 1.5A (too much for Interconnect)The supply will have to be relocated.Example 2 End Connected Power Supply1. Sum up the currents (QCPort Interconnect system)=0.1 + 0.4 + 0.3 = 0.8 A (OK since 10 feet allows 1.0A)2. Find the voltages for each node using the equation for Long Run.SUM {[(L n x (0.105)) + (Nt x (0.005))] x In } <= 4.65VDevice 1 [(20 x (0.105)) + (1 x (0.005))] x 0.1 = 0.21VDevice 2 [(30 x (0.105))+ (2 x (0.005))] x 0.4 = 1.26VDevice 3 [(40 x (0.105)) + (3 x (0.005))] x 0.3 = 1.26V3. Add each Devices voltage together to find the total voltage.0.21 + 1.26 + 1.26 = 2.73V (OK)ResultsSince the total voltage does not exceed 4.65V, the system will operate properly.PS D20.4AD30.3ATD10.1A10 foot 10 foot 10 foot 10 footT10 footPS D21.1AD30.3ATD10.1A1 foot 1 foot 1 foot 1 footT1 foot