Eaton ATC-100 Instructional Booklet

Also see for ATC-100: Instructional booklet Operation & maintenance manual

Contents

IB01602018E For more information visit: www.eaton.comInstructional BookletEffective: March 2010 Page 23O & M Manual for theATC-100 Breaker Based Transfer SwitchSection 5: Operation5.1 GeneralAn ATS provides main contacts to connect and disconnect theload to and from the Utility and Generator power sources (Section3.2.2). Each transfer mechanism provides the mechanical motionrequired to open and close the mechanically interlocked main con-tacts (Section 3.2.3).Note that the transfer mechanisms for the two types of ATSsdescribed in this booklet (30-150 A and 225-600 A) are differentfor both the manual and automatic modes.IF AN ATS WITH ANY TYPE OF ELECTRICAL OPERATING CAPABILI-TIES IS TO BE OPERATED UTILIZING THE MANUAL OPERATING HAN-DLE, IT IS STRONGLY RECOMMENDED THAT THE TRANSFER MOTORCIRCUIT FIRST BE ISOLATED. THIS IS ACCOMPLISHED BY UNPLUG-GING THE (P3) PLUG MARKED MOTOR DISCONNECT (FIGURE 31).ANY ATTEMPT TO USE THE MANUAL OPERATING HANDLE WITHOUTFIRST ISOLATING THE MOTOR CIRCUIT CAUSES AN AUTOMATICTRANSFER.Figure 28. Motor Disconnect P3 must be disconnected.5.2 Manual Operation (225-600 A)The manual operating handle can be used to create the rotationalmotion required to open and close the main contacts through arigid mechanical interlocking system (Figure 29). An indicatorwheel attached to the operating handle and mechanical interlock-ing system rotates with each movement of the handle to openand/or close the main contacts (Figures 30). Three distinctswitch positions are provided and indicated visually on the indica-tor wheel (Figure 31).Figure 29. ATS Manual Operating Handle in Use (225-600 AModels).Figure 30. Indicator Wheel Mounted in the Switch with MotorUnder the Wheel (225-600 A Models).NOTICE