Eaton AMPGARD Installation, Operation And Maintenance Instructions

Contents

4Instruction Booklet IB48050Effective September 2012Instructions for installationoperation and maintenance of theAMPGARD 15 kV 300A vacuum startereaton Corporation www.eaton.comIsolation SwitchMain FusesIsolation SwitchOperating HandleMain ContactorCPT/PT Primary FusesCPTPTsFigure 3. Medium Voltage Compartmentm cautionmain fuses weigh 44 pounDs for the 400a-15bhcls-400.Low voltage componentsThe low voltage components consisting of a protective relay,interposing relay, test power circuit, terminal blocks, and optionalequipment are mounted in the low voltage control compartmentlocated on the front of the controller medium voltage door The lowvoltage compartment is fabricated from steel sheets to provideisolation from the medium voltage components mounted behind thelow voltage compartment A window is provided in the low voltagecompartment to allow the user to view the position of the isolationswitch before entering the medium voltage compartment Seesection on Isolation Switch for further detailsFigure 4. Low Voltage CompartmentIsolation switchThe controller isolation switch is a non-loadbreak deviceMechanical and electrical interlocks are provided to ensure that themain contactor is de-energized before the switch can be operatedIn the open position, the switch isolates medium voltage from themain controller compartment, allowing access to the controller forinspection and maintenance For standard applications, the isolationswitch includes ground fingers that ground the line side of thepower fuses when the switch is in the open positionm DangerampgarD controllers are sometimes energizeD by a back-feDconDition that allows the meDium voltage compartment tobe energizeD with the isolation switch in the open position.stuDy the plant single-line Diagrams to make certain thatno back-feeD situation exists before entering the meDiumvoltage compartment.all power sources must be isolateD anD lockeD out beforeservicing the equipment.for applications where the controller is back feD,the grounDing fingers shoulD be removeD from theisolation switch.The switch consists of a fixed rear portion and a removable frontportion Refer to Figure 6 and Figure 7 The fixed portion includesthe controller line fingers and a moveable shutter that isolates theline fingers when the switch is in the open position The removableportion is operated by a handle mechanism that extends through thecontroller medium voltage door With the handle in the up position,the switch is closed, and medium voltage is available for connectionto the controller load With the handle in the down position, theswitch is open, and medium voltage is isolated from the controllerand the controller load