3
Instruction.Booklet.
IB48066
Effective November 2010
Instructions for Installation, Operation and Maintenance
of the Ampgard 720A Reduced Voltage Soft Starter
EATON CORPORATION www.eaton.com
1.2 Main Cell
The.upper.cell.consists.of.a.full.voltage.starter.with.a.non-load.
break.isolation.switch,.medium.voltage.current.limiting.fuses,.an.SL.
contractor,.and.current.transformers ...The.low.voltage.control.com-
partment.is.located.on.the.front.of.the.medium.voltage.door ...(See.
Fig. 2.
)..Refer.to.IB48043.(Instructions.for.Ampgard.720A.Ampere.
Medium.Voltage.Starter).for.operating.and.maintenance.instructions.
on.the.main.cell .
Figure 2. Main Cell
Low.Voltage.
Compartment
Main.Fuses
Main..
Contactor
Isolation..
Switch
The.following.components.are.located.on.the.front.of.the.low.volt-
age.door.of.the.main.cell ..(See.
Fig. 3
)
•
Bypass.Mode.LED.–.After.the.motor.is.started.and.reaches.
speed,.the.bypass.contactor.closes.to.bypass.the.SCRs.in.the.
soft.starter ...The.Bypass.Mode.Indicating.Light.will.illuminate.
when.the.SCRs.are.bypassed ..
•
RVSS.Fault.LED.–.In.the.event.of.a.soft.starter.failure,.the.RVSS.
Fault.LED.will.illuminate ..
•
RVSS.Fault.Reset.Pushbutton.–.In.the.event.of.a.soft.starter.fail-
ure,.the.RVSS.Fault.Reset.pushbutton.must.be.depressed.to.clear.
the.fault ..
•
Optional.start-stop.pushbuttons.and.runstopped.indicating.lights.
are.supplied.when.specified ..
Figure 3. Low Voltage Components
