Eaton Ampgard 400 Instruction Manual

5Instructional Leaflet IB48041Effective December 2009Instructions for AMPGARD 400Amedium voltage startereaton corporatIon www.eaton.comFigure 8. Handle Mechanism with Contactor and Door InterlocksMechanical and electrical interlocks are provided to ensure that thenon-loadbreak isolation switch cannot be opened or closed unlessthe main contactor is de-energized. (See contactor interlock rod inFigure 8.) Do not attempt to force the switch-operating mechanismwith the main contactor closed. The handle mechanism is designedto fail before the isolation switch can be opened with the maincontactor closed. cautionapplying excessive force to the switch hanDle with themechanical interlocks engageD will result in Damage tothe switch.An electrical interlock is provided to disconnect the control powertransformer secondary before the isolating switch stabs aredisconnected from the controller line fingers. This interlock ensuresthat the switch is breaking transformer magnetizing current only.Do not connect additional loads to the controller isolating switch. Dangerif loaDs greater than the interrupting rating of the switchare connecteD to the switch, equipment Damage, personalinjury, or Death may occur.An optional key interlock may be provided to lock the switch in theopen position for special configurations. Refer to the specific orderdrawings to determine if key interlocks have been provided.On reversing, two-speed, or autotransformer type starters,mechanical interlocks are provided to prevent two or morecontactors from closing at the same time.Low voltage controlThe low voltage control compartment is located in a steel pocket inthe medium voltage door. A low voltage door with up to four devicepanels provides access to the low voltage compartment with themedium voltage door closed. The low voltage compartment swingsout of the way with the medium voltage door as it is opened,allowing access to the isolation switch, fuses, main contactor,and other starter components that are mounted behind the lowvoltage compartment.A row of control terminal blocks is provided on the left side of thecontroller. They can be accessed by opening the low voltage door.The blocks are fixed mounted and remain in place when the mediumvoltage door is opened. Refer to Figures 9 and 10 for details.Figure 9. Low Voltage Terminal Blocks, Medium VoltageDoor openFigure 10. Low Voltage Terminal Blocks, Low VoltageDoor openA test plug and receptacle are typically supplied inside the lowvoltage section. The receptacle is wired to the secondary of thecontroller control power transformer. Test power can be used toenergize the control circuit by removing the plug from the receptacleand using a standard extension cord to energize the plug. Refer toFigure 11 for specific location.Figure 11. Low Voltage Compartment with Test Plug DangerDo not connect test power to the starter control circuitwithout removing the plug from the receptacle. failure to Doso will result in a back-feeD conDition on the control powertransformer, which will generate high voltage insiDe thecontroller with the isolation Device open. high voltage cancause severe injury or Death.IsolationSwitchDrive RodContactorInterlockRodMV DoorInterlockPlungerMV DoorHold-DownInterlockTest Plug