Eaton DS-206S series Instructions Manual

Contents

32Instruction Booklet IB 33-790-1JEffective November 2010Instructions for Low Voltage PowerCircuit Breakers Types DS and DSLEaToN CorPoraTIoN www.eaton.com5.1.7.4 The CONNECT PositionThis is the position in which both primary and secondarydisconnecting contacts on the breaker are engaged withtheir stationary counterparts in the compartment.It is the farthest position from the front of the compart-ment into which the breaker can be levered, as (1) shownby the drawout position indicator, and (2) when themechanical stop is felt as a sudden increase in load onthe levering crank handle.Note: When levering in from the TEST position, anincrease in load on the crank handle will be felt asthe main disconnecting contacts are engaged. Ascranking is continued, the load will decrease someand then suddenly increase as the final connectedposition stop is reached.In this position all of the conditions listed for TEST posi-tion also exist, exceptIN THIS POSITION, DO NOT ATTEMPT TO ELECTRI-CALLY CHECK THE AMPTECTOR TRIP DEVICE WITHTHE TEST KIT OR BY ANOTHER METHOD BECAUSEBREAKER WILL BE TRIPPED AND CAUSE DISRUP-TION OF SERVICE.The trip plate on the hinged compartment door will beoperative, and can be used to trip the breaker when thisdoor is closed.In addition to the above interlocks, the interference inter-lock described in Section 5.1.6.1 prevents a breaker ofthe wrong frame size from being placed in a compart-ment.5.1.8 Detailed Explanation of Mechanical InterlockSystemThat part of the interlock system which prevents closingof the breaker while being driven in either direction by thelevering device, or while it is standing in any intermediateposition between “TEST” and “CONNECT” or “DISCON-NECT”, is shown in Figure 28a and b. Figure 28a showsthe shutter and trip plate for normal operation, such as inDISCONNECT, TEST, or CONNECT positions. Thebreaker can be closed and tripped open by all availabledevices in the latter two positions except the trip plate onthe hinged compartment door.In Figure 28a, the shutter prevents pushing the leveringdevice crank handle onto the worm shaft. If the shutteralone is pushed downward, it will rotate slightly about itspivot pin and its lower projection (see Figure 28a) strikesthe hook on the trip plate, and the worm shaft will not becleared. So it is necessary to push the trip plate in, whichmoves the hook back out of the way of the shutter lowerprojection. This permits the shutter to be pushed down-ward to clear the worm shaft for the levering device crankhandle, as shown in Figure 28b.Note that pushing the trip plate in also pushes the tripshaft pin so as to rotate the trip shaft counterclockwise,thus tripping the breaker open. If closing is attemptedwith the linkage as in Figure 28b, a trip free operation willbe made.Movement of the shutter also is controlled by the interlockcam, mounted on the levering device shaft to the left ofthe worm gear. The interlock cam has a fixed relation tothe levering device arms. Figure 29a, b, c, and d showthe relation between the shutter, interlock cam and lever-ing device arms for the four basic positions of the drawoutunit in the compartment.Figure 29a shows the CONNECT position. The cam is ina position to allow free travel of the shutter interlock pin.Therefore the shutter can be pushed downward, but onlyafter pushing in the trip plate as in Figure 28. This tripsthe breaker and therefore prevents levering out with thebreaker closed.Figure 29b shows the TEST position. Note that betweenCONNECT and TEST positions the cam will rotate so asto block the shutter interlock pin. This prevents the shut-ter returning to its closed position and releasing the tripplate if the levering device crank handle is removed.Thus, if a closing operation is tried during this part of thetravel, a trip-free operation occurs and the breaker con-tacts do not close. Note that this is true for either directionof breaker travel so that no load is made or broken at thedisconnecting contacts.When the breaker gets to the TEST position, a slot in theinterlock cam allows free movement of the shutter inter-lock pin, and the shutter returns to closed position whenthe crank is removed. The levering device arms arealmost vertically downward.Figure 29c shows the DISCONNECT position. Here alsothe cam rotates so as to block the shutter interlock pinwhile the breaker is between positions thus holding theshutter open. When the exact position, as shown on theindicator, is reached, the shutter will close when thecrank is removed. The levering arms will be approxi-mately 40° below the horizontal.