Powell PowlVac ARG 4 Series, Instruction Bulletin

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40 Recommended Renewal Parts and Replacement Procedures
01.4IB.50023A PowlVac® Electrically Operated 15kV Ground and Test
per Long Island Railroad Specifications
c. Remove the two bolts holding the
motor mounting bracket to the lower
front cover and slide the motor to the
left, disconnecting the motor shaft from
the mechanism, and lift the motor out.
d. Lubricate the end of the shaft of the
new motor liberally with Rheolube
368A.
e. Position the new motor assembly in the
device, being sure that the pin on the
end of the drive shaft engages the slot
in the mechanism shaft.
f. Bolt the motor to the front cover and
plug it into the wiring harness.
g. Close the grounding switch electrically
several times to ensure that the motor
operates smoothly.
h. Replace horizontal front cover.
5) Shunt Trip Coil
When supplied, the shunt trip coil is located
to the left of the mechanism near the rear
(Figure 4, b) .
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 these steps to replace the shunt
trip coil:
a. Remove the upper portion of the
ground and test device front cover.
b. Unplug the trip coil from the wiring
harness.
c. Remove the two bolts holding the trip
coil assembly to the mechanism frame
and remove the assembly.
d. Insert the new trip coil assembly into
the device, bolt it into place and plug it
into the wiring harness.
e. With the mechanism in the reset
position, check the gap between the
trip coil armature and the trip lever
extending from the trip shaft. This
gap should be between ¼” and ⁵/₁₆”. If
necessary, bend the trip lever slightly to
achieve this setting.
f. Close and trip the grounding switch
electrically several times to ensure that
the coil is working properly.
g. Replace the upper front cover.
6) Control Relay
The control relay is mounted on the left
side of the mechanism on the lower front
cover (Figure 3, e) .
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 these steps to replace the control
relay:
a. Remove the upper portion of the
ground and test device front cover.
b. Disconnect leads from the control relay,
being careful to note which wires go to
which terminals.
c. Loosen lower mounting screw of relay.
d. Remove upper mounting screw and lift
relay off lower screw.
e. Place new relay over lower screw,
reinstall upper screw, and tighten both
screws.