4
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
1.3 Bypass Cell
The.bypass.cell.consists.of.an.SL.contactor.which.is.used.to.bypass.
the.SCRs.in.the.soft.starter.when.the.motor.reaches.full.speed ..
There.is.an.interlock.tab.that.prevents.this.cell.door.from.being.
opened.until.the.isolation.switch.and.main.cell.door.have.been.
opened.to.insure.that.line.voltage.is.not.present ..(See.
Fig. 4.
)
Figure 4. Bypass Cell
Bypass.Contactor
Door.Interlock.Tab
1.4 RVSS Cell
The.right.side.cell.houses.the.Ampgard.RVSS.assembly ..The.RVSS.
cell includes a medium voltage door with an interlock tab ..This
feature.prevents.access.to.the.RVSS.cell.until.the.isolation.switch.
andmain cell door have been opened, insuring that line voltage is
not.present ..The.RVSS.door.must.be.closed.prior.to.closing.the.main.
starter doors ..(See
Figs. 5 & 6.
)
Figure 5. RVSS Cell
WARNING
BARRIERS MUST BE INSTALLED BEFORE ENERGIZING STARTER.
FAILURE TO INSTALL BARRIERS CAN RESULT IN EQUIPMENT FAILURE,
SERIOUS INJURY, OR DEATH.
Figure 6. Interlock Tab
Low.Voltage.Compartment
RVSS
Medium.Voltage.Door
Interlock.Tab
