Powell PowlVac ARG 4 Series, Инструкционный бюллетень

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42 Recommended Renewal Parts and Replacement Procedures
01.4IB.50023A PowlVac® Electrically Operated 15kV Ground and Test
per Long Island Railroad Specifications
9) Motor Cutoff Switch Assembly
The motor cutoff switch assembly is located
in the lower left of the ground and test
device, just behind the lower front cover
(Figure 4, c) .
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 motor
cutoff switch:
a. Remove the upper portion of ground
and test device front cover.
b. Disconnect leads from switch, being
careful to note which wires came from
which terminals.
c. Remove the two bolts holding the
switch mounting bracket to the lower
front cover and remove the assembly.
d. Install new motor cutoff switch
assembly, bolt it to the front cover and
reconnect the wiring harness.
e. Close the grounding switch electrically
several times to ensure that the
mechanism operates smoothly.
f. Replace the upper front cover.
10) Auxiliary Switch
The auxiliary switch is located on the left
hand side panel of the ground and test
device (Figure 3, c) .
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 auxiliary
switch:
a. Remove the upper portion of the
ground and test device front cover.
b. Remove two screws holding switch to
the side panel. Do not lose nut plate
into which these screws are threaded.
c. Disconnect leads, being careful to note
which leads are connected to which
terminals.
d. Reconnect all leads to proper terminals
of new switch.
e. Locate new switch on side panel and
reinstall two mounting screws. Do not
tighten screws.
f. Adjust by rotating the switch about
the lower mounting hole. The upper
hole is enlarged to allow rotation. The
switch is properly adjusted when there
is continuity between the terminals
marked “Common” and “Normally Open”
with the ground and test device in the
open position. Check both switches
that make up the assembly. It may be
required to bend the arm on one or
the other of the switches in order to
accomplish this adjustment.