8
Instructional Leaflet
IB48041
Effective December 2009
Instructions for AMPGARD 400A
medium voltage starter
eaton corporatIon
www.eaton.com
Figure 18. Horizontal Wireway and Ground Bus
Setting of adjustable protective devices
AMPGARD controllers may contain protective devices, such as
solid-state motor protection relays, overcurrent relays, incomplete
sequence timers, and other devices, critical to the proper operation
of the starter. Due to the wide variation in job site parameters, these
devices are not set at the factory. It is the purchaser’s responsibility
to ensure that all adjustable devices are properly set before energiz-
ing the equipment. Warranty is void if adjustable devices are not
properly set prior to initially starting the equipment.
Danger
failure to properly set aDjustable Devices may result in
equipment Damage, personal injury, or Death.
pre-startup checks
Before attempting to put a newly installed controller into service,
study the wiring diagrams, control schematics, other order-specific
drawings, and all instruction literature. Ensure that all adjustable
devices, including protective relays and timers, have been
properly set.
Verify that the controller and motor are connected per the Eaton
drawings. This is particularly essential in this class of equipment, as
the fuse ratings, current transformers, and overload protection are
based on the characteristics of the particular motor (or other load)
to be controlled.
Ensure that all safety precautions have been taken and that the
installation conforms to applicable regulations and safety practices.
The equipment should be free of dirt, scraps of wire, tools, and
other foreign material.
The dielectric strength of the vacuum interrupters should be
checked before the contactor is energized for the first time and
regularly thereafter to detect at the earliest possible date any
deterioration in the dielectric strength of the interrupter, because
this may result in an interruption failure. The test is best performed
with the contactor removed from the controller cubicle. Removal
instructions can be found later in this instructional leaflet in the
“Maintenance/Contactor” section. If testing is performed with the
contactor installed, care 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 protect the CPT or PTs. Cables to the load
should be disconnected. Although an AC test is recommended, a
DC test may be performed if only a DC test unit is available. A good
vacuum interrupter will withstand a 16 kV–60 Hz test or a 23 kV–DC
test across the normally open contact gap. When performing DC
tests, the voltage should be raised in discrete steps until the final
test voltage is reached. When tested with an AC high-potential
tester, expect a capacitance leakage current of approximately
1 milliampere per interrupter. Refer to IB-48018N for more
information on dielectric testing of the vacuum interrupters.
The insulation level of the starter should be checked and recorded
before the unit is energized.
Enclosure doors should close easily. Do not force doors closed, but
rather look for improperly positioned contactors, isolating switches,
or other devices.
Ensure that all phase barriers are in good condition and are properly
installed. Note that larger and/or additional barriers are used when
double-barrel fuses are in use. Refer to
Figures 6
,
12
,
14
, and
19
for examples.
Danger
ensure that the correct barriers are useD with Double-barrel
fuses. failure to install the correct phase barriers can result
in equipment Damage, severe injury, or Death.
Figure 19. Lower Fuse Mounting with optional Fuse Clips
Verify that the contactor is fully inserted into the controller
compartment. On stab-connected type contactors, verify that all
finger-stab combinations are properly engaged. On bolt-connected
contactors, verify that all connections have been properly torqued.
On stab-connected contactors, a mounting bracket is provided to
secure the contactor in the cell. Verify that the securing bolt is in
place and is properly tightened to the bracket. A small gap between
the contactor baseplate and the mounting bracket is normal.
Figure 20. Contactor Hold-Down Bracket
Danger
all sources of meDium voltage must be isolateD anD lockeD
out at the upstream feeDer before the interlock check can be
performeD. failure to isolate anD lock out all incoming power
to the lineup can result in equipment Damage, severe injury,
or Death.
Ground
Bus
Horizontal
Wireway
(extends
length of
lineup)
Phase
Barriers
(4)
Hold-Down
Bracket
