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4

Instructional Leaflet 

IB48041

Effective December 2009

Instructions for AMPGARD 400A

medium voltage starter

 

eaton corporatIon

 www.eaton.com

Figure 4. Shutter Closed 

 Danger

Do not enter the meDium voltage starter compartment with-

out visually verifying that the isolation switch is open anD 

the isolating shutter is in place. entering a compartment 

without the isolating shutter in place may result in severe 

injury or Death.

Figure 5. Fixed Portion—ISo Switch

Figure 6. Removable Portion—ISo Switch

Power fuses

AMPGARD controllers are supplied with Eaton Type CLS, CLE,  

or HLE current-limiting power fuses. Fuses may be either bolt-in 

type or clip-in type. All fuses include an indicator that pops up when 

the fuse has blown. An optional blown fuse trip bar may be supplied 

with bolt-in fuses. The mechanism is mounted on the controller  

isolation switch and may be wired to trip the controller off-line in  

the event of a blown fuse.

Vacuum contactor

400A AMPGARD medium voltage controllers are supplied with 400A 

vacuum contactors. The contactors are supplied with one of two 

interrupting ratings: The standard contactor has an interrupting rating 

of 4500A, while the high-interrupting contactor has an interrupting 

rating of 8500A. The standard contactors are typically supplied on 

controllers with single-barrel main fuses (<188 FLA). They are also 

supplied when auxiliary contactors are required, such as start and 

run contactors on autotransformer starters and run contactors on 

reactor starters. High-interrupting contactors are supplied on  

controllers with double-barrel fuses. A code plate is provided in  

cells originally equipped with high-interrupting contactors to prevent 

the inadvertent installation of standard interrupting contactors into 

those cells.

Figure 7. SL Vacuum Contactor

Contactors are typically three-pole devices except in the case of the 

start contactor on autotransformer starters, which are normally two-

pole devices.
Refer to 

Instruction Book IB48018N

 for further details on the 

operation and maintenance of the vacuum contactors.
Controllers supplied as transformer feeders, or for other specialized 

applications, are sometimes supplied with contactors that include  

a mechanical latch device. Refer to 

Instruction Book IB48020

 

for further details on the operation and maintenance of the  

latch mechanism.

Safety interlocks

AMPGARD controllers are manufactured with several built-in inter-

lock provisions and safety features to reduce hazards and provide 

proper operating sequences:

• 

A mechanical interlock prevents opening the medium voltage door 

with the switch in the closed position. Ensure that the medium  

voltage door is fully closed and latched using the two latches on  

the right side of the door to prevent damage to the interlock 

bracket on the back of the door

• 

An additional interlock prevents closing of the switch unless the 

medium voltage door is closed (see MV door interlock plunger in 

Figure 8

). On controllers that require two structures (reduced 

voltage starters, for example), the door to the second structure  

will also be interlocked with the switch-operating mechanism. The 

second door must be closed before the main door is closed. Both 

doors must be closed before the switch operator can be moved 

to the closed position

ote:

N

Attempting to close the switch with the door open can cause damage 

to the operating mechanism. 

 

Barber Poles 

Indicating 

Shutter 

Closed

Phase  

Barriers (4) 

for Double- 

Barrel Fuses

Summary of Contents for Ampgard 400

Page 1: ...former reduced voltage solid state or two speed type They may control induction or synchronous machines and they may be non reversing or reversing While this instructional leaflet is dedicated primari...

Page 2: ...ake Break Short time current 30 seconds 1 second 8 6 milliseconds 0 5 cycle Standard service altitude Optional service altitude Mechanical life Electrical life BIL Dielectric strength 60 Hz Closing ti...

Page 3: ...oor The low voltage compartment is fabricated from steel sheets to provide iso lation from the medium voltage components mounted behind the low voltage compartment A window is provided in the low volt...

Page 4: ...y equipped with high interrupting contactors to prevent the inadvertent installation of standard interrupting contactors into those cells Figure 7 SL Vacuum Contactor Contactors are typically three po...

Page 5: ...closing at the same time Low voltage control The low voltage control compartment is located in a steel pocket in the medium voltage door A low voltage door with up to four device panels provides acce...

Page 6: ...ass ropes or cables through the lift holes Use slings with safety hooks or shackles of adequate load rating Each controller is properly adjusted at the factory before shipment However vibration and me...

Page 7: ...Compartment Control connections Control wires may enter the enclosure from either the top or the bottom For lineups with main bus a low voltage wireway is located in the left front of the bus compartm...

Page 8: ...are must be taken to ensure no damage is inflicted on the controller control power transformer CPT potential transformers PT or to the controller load Removal of the primary fuses is sufficient to pro...

Page 9: ...of the fuse If a fuse has blown due to a fault it is likely that the other fuses experienced a similar overcurrent condition In this case Eaton recommends that all three fuses be replaced Ensure that...

Page 10: ...e fingers Inspect for any signs of mechanical wear or overheating To withdraw the removable portion 1 Remove the three main fuses 2 Remove the control plug 3 Remove the cotter pin and clevis pin from...

Page 11: ...Reinstallation is the reverse of the procedure previously discussed Make sure that the shaft of the removable portion of the switch is rotated to the fully open position before reinstallation Danger I...

Page 12: ...ton Corporation All Rights Reserved Printed in USA Publication No IB48041 Z9119 December 2009 PowerChain Management is a registered trademark of Eaton Corporation All other trademarks are property of...

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