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38
Recommended Renewal Parts and Replacement Procedures
01.4IB.50023A
PowlVac® Electrically Operated 15kV Ground and Test
per Long Island Railroad Specifications
c. r
eplAcement
p
rocedureS
This section includes instructions for replacing
the parts recommended as renewal parts.
Before attempting any maintenance repair
work, take note of the safety practices outlined
in
of this instruction bulletin.
!
CAUTION
Ensure that the control circuits are
deenergized and the ground and test device
is resting securely outside the switchgear
housing. Do NOT start to work on a closed
ground and test device or a device with the
main closing spring charged. When any
maintenance procedure requires the opening
or closing of the ground and test device or
the charging of any of the stored energy
mechanism springs, exercise extreme caution
to ensure that all personnel, tools, and other
miscellaneous objects are kept clear of the
moving parts of the charged springs.
1) Grounding Switch Movable Contact
The grounding switch movable contacts
are located at the top of the
moving arms of the grounding switch,
behind the windows in the front cover.
Ensure that the control circuits are
deenergized and the ground and test device
is deenergized, disconnected by means of
a visible break, and securely grounded. Do
NOT start to work on a closed ground and test
device or a ground and test device with the
main closing spring charged.
!
CAUTION
Perform the following steps to replace the
grounding switch movable contact:
a. Remove upper portion of ground and
test device front cover.
b. With grounding switch in “OPEN”
position, remove two ³/₈” bolts holding
movable contact to top of moving arm
c. Bolt the new movable contact in place,
using existing hardware. Torque ³/₈”
bolts to 20-30 ft-lbs.
d. Close grounding switch and check the
kick-off spring pressure as described
Ch 6 Maintenance, C. Grounding
Switch Area, b. Kick-Off Spring Pressure
. If necessary, adjust the
spring pressure.
e. Replace the front cover.
2) Grounding Switch Stationary Contacts
The grounding switch stationary contacts
are located on the front of the middle
insulating barrier of the ground and test
device
.
Ensure that the control circuits are
deenergized and the ground and test device
is deenergized, disconnected by means of
a visible break, and securely grounded. Do
NOT start to work on a closed ground and test
device or a ground and test device with the
main closing spring charged.
!
CAUTION
Perform the following steps to replace the
grounding switch stationary contacts:
a. Remove the upper portion of ground
and test device front cover.
b. Remove six insulating tubes from the
test port jacks.
