12
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
Maintenance
A maintenance program should be established as soon as the
controller has been installed and put into operation . After the
controller has been inspected a number of times at monthly
intervals and the conditions noted, the frequency of inspection
can be increased or decreased to suit the conditions found .
Before attempting maintenance, consult the order specific
drawings and instructions supplied with the controller .
Insulation level
The insulation resistance between poles, and from each pole to
ground, should be measured and recorded . It is not practical to
specify an absolute value for this reading because it is dependent on
other connected apparatus and conditions of service . However, any
unusually low reading or abrupt reduction in a reading may indicate
a possible source of trouble, and the cause should be investigated
and corrected .
Fuses
Inspect the current limiting fuses after each relay initiated trip,
because this is the most severe service to which they will be
subjected . Check the fuse resistance, and compare with the value
of a new fuse . A visual sign of an open fuse is provided by a pop-up
indicator on the top of the fuse . If a fuse has blown due to a fault,
it is likely that the other fuses experienced a similar overcurrent
condition . In this case, Eaton recommends that all three fuses be
replaced . Ensure that the replacement fuses are of the same rating
and mounting configuration as those originally supplied .
Blown
Fuse
Indicator
Figure 24. Blown Fuse Indicator
Fuses can be removed by loosening the four nuts that secure the
fuses to their mounting studs on the lower portion of the copper
plate . The phase barriers on the lower fuse mountings can be
removed if desired to ease access to the mounting studs and
the nuts . The upper phase barriers are not removable . Installation
is the reverse of removal . Bolt-in fuses must be torqued to
25 lb-ft (33 Nm) .
•
Remove nuts
closest to fuse
•
Remove lower
nuts first
•
Be careful when
removing last nut
from fuse as it may
fall unless supported
Figure 25. Fuse Nuts
m
caution
main fuses weigh 44 pounDs for the 400a-15bhcls-400.
Contactor
Inspect the contactor line and load fingers for signs of arcing or
overheating . Replace as necessary . Inspect the mechanical interlock
components attached to right side of the contactor main operating
shaft and side sheets . Ensure that the lever is secure on the
shaft and that the pivoting arm moves freely . Verify that the finger
assemblies are in their neutral (horizontal) position before reinserting
the contactor into the cell . No lubrication is required .
Refer to IB48051 for details of additional contactor operation and
maintenance information .
Follow the steps below to remove the contactor from the starter
cell . Installation is the reverse of the removal process . Note that the
mechanical interlock mechanism on the side of the contactor must
be reconnected before the contactor can be closed . The mechanism
is weighted in such a manner that the contactor cannot operate until
the interlock rod clevis is reconnected .
Figure 26
through
Figure 29
illustrate the removal sequence .
1.
Unplug control harness .
2.
Remove bolt from hold-down bracket .
3.
Unsnap pin collar from interlock rod clevis .
4.
Remove pin from interlock rod clevis .
5.
Withdraw contactor from cell .
