Eaton DCM2000-A21X Installation And Operation Manual

9 Copyright © 2011 Eaton Industries Pty Ltd All Rights ReservedDocument IEE1157-007-03____________________________________________________________ General DescriptionThe common positive cable connection to the same load connects to an identical two poleparalleling bar bolted to the common busbar (for connection of larger cable).There are up to 10 off two pole positions, 5 connected to live input A and 5 connected tolive input B. Three Pole BreakersThese plug into a three pole position and have an outgoing cable connection to a three poleparalleling bar above the three breaker positions (which has larger stud size M10 for a largercable 150mm2). This is to be used for a 250A 3 pole circuit breaker. These three polepositions require a 3 pole insulator.The common positive cable connection to the same load connects to an identical three poleparalleling bar bolted to the common busbar (for connection of larger cable).There are up to 6 off three pole positions, 3 connected to live input A and 3 connected tolive input B.Please Note: Thermal testing of DCM modules fitted with 6 off 3 pole circuit breakersconcluded that there must a 1 pole gap between pairs of 250A 3 pole breakers when circuitsare expected to supply loads approaching the breaker current rating. Refer Chapter 4Selection of Circuit Breakers. Mix of Breaker SizesIt is possible to fit a mixture of single pole, two pole and three pole breakers in the sameDCM. Refer to note in Three Pole Breakers above regarding a 1 pole space between pairs of250A 3 pole breakers. This 1 pole space must not be filled by a single pole circuit breaker. Common Input Bar OptionThe A and B input bar positions can be fitted with a common live input bar to make theDCM a single plane unit.Auxiliary Contact Alarm Details Auxiliary Contact DetailsCircuit breaker auxiliary contact is a changeover contact output.The top pin (with breaker lever up for ‘on’) is the common of the changeover contact.With the breaker off the bottom pin is the closed contact and the centre pin is the open contact. Auxiliary Contact PCB DetailsThe auxiliary contact pcb commons all auxiliary common positions, commons all NO contactpositions and commons all NC contact positions. The pcb is fitted with an RJ45 socket eachend and a 3 pin header with a 2 position bridging link for setting alarm options. Refer to theCircuit Diagram DRG 3700166 for details of this link.For this application the link will be set so that, when any circuit breaker is switched off, theauxiliary contact of that breaker links pin 1 to pin 6 of the RJ45 connector. For this to occur, theheader link should be between pins 2 and 3. The pcb identifies pin 3.and the link should be inthe right hand position.