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