11
Instruction Booklet
IB48050
Effective September 2012
Instructions for installation,
operation, and maintenance of the
AMPGARD 15 kV, 300A vacuum starter
eaton Corporation
www.eaton.com
Ensure that all phase barriers are in good condition and are properly
installed . Barriers are located in the isolation switch, the lower
fuse mounts, the contactor load stab assembly, and the motor
load stab assembly .
Phase
Barriers
(4)
Figure 21. Lower Fuse Mounting With Phase Barriers Installed
Verify that the contactor is fully inserted into the controller
compartment . All finger-stab combinations must be properly
engaged . A mounting bracket is provided to secure the contactor
in the cell . Verify that the securing bolt is in place and properly
tightened to the bracket . A small gap between the contactor
baseplate and the mounting bracket is normal . Do not overtighten
the bolt, or damage to the contactor can occur .
Hold-Down
Hardware
Figure 22. Contactor Hold-Down Bracket
m
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.
Mechanical interlocks should be checked as follows:
Isolate and
lock out all incoming power sources
. Open the isolation switch .
Open the medium voltage door . Verify that the mechanical interlocks
between the contactor and the handle mechanism are connected
and functioning properly . The switch drive rod connection and the
contactor interlock rod connections should be verified by operating
the handle mechanism, open-to-close-to-open . The door interlock
plunger must be held in by hand during this operation . Verify that
the pivot arm on the handle mechanism drops down and makes
contact with the cam after the handle is fully closed . Failure to
contact the cam may indicate a problem with the adjustment of the
aluminum interlock arm on the contactor . Close the main contactor
with test power and attempt to operate the switch while holding the
door interlock plunger in . The mechanical interlock should prevent
the switch from operating . Avoid putting excessive force on the
operating handle during this operation or damage to the handle
mechanism may occur .
Verify that the door interlock plunger
returns to its normal forward position after releasing. If the
plunger remains in the depressed position after it is manually
released, the interlock will not properly function to prevent
operation of the switch with the door open.
Switch
Drive
Rod
Door
Interlock
Plunger
Pivot
Arm
Contactor
Interlock
Rod
Cam
Pivot Arm Should
Contact Cam
MV Door
Interlock
Figure 23. Mechanical Interlock Verification
