Table of Contents
Advertisement
DETENT POSITION
For maintenance and test purposes, the unit can be par-
tially withdrawn (approximately 1 inches) until the stabs
are free of the bus. In this position, the quarter-turn latch
can be rotated clockwise to engage the detent position
slot; this will secure the unit to ensure the stabs remain
disengaged during maintenance. See Figure 29. The
latch can be padlocked in this position.
OPERATING HANDLE LINKAGE ADJUSTMENT
Movement of the operating handle in the vertical plane
should not be restricted by the handle cavity at either
the top or bottom to its travel. Should restriction occur,
eliminate it adjusting the length of the operating linkage
as shown in Figure 30. Depending on the type of pri-
mary disconnect device contained in the control unit, it
may be necessary to lengthen or shorten the linkage.
AUTOMATIC SHUTTER TRAVEL ADJUSTMENT
When the optional labyrinth vertical bus barrier is installed
in the control center, a shutter is provided to automati-
cally cover the stab openings when a control unit is with-
drawn. The shutter is opened by engagement of the
left-hand side of the control unit with the shutter arm link-
age attached to the left-hand vertical structural mem-
bers. When the unit is withdrawn free of the linkage, a
spring automatically moves the shutter to its closed po-
sition. See Figure 31 and Figure 4.
With the control unit removed, the shutter should com-
pletely cover the stab openings. If it does not cover the
openings, use an adjustable wrench to bend the link arm
to the right until the shutter covers the stab openings.
If, on re-insertion of the control unit, interference is felt
between the stab assembly at the rear of the unit and
the shutter, the engagement of the control unit with the
shutter arm linkage is insufficient to fully open the shut-
ter. Use an adjustable wrench to bend the linkage arm
inward toward the unit to increase its engagement with
the unit. An inward bend of approximately 1/4 inch will
provide sufficient additional shutter travel.
INSTALLING PILOT DEVICES
The device panel can accommodate up to six pilot de-
vices such as oil-tight pushbuttons, indicating lights, se-
lector switches and miniature meters. If unused space
is available and the addition of other devices is desired,
observe the following procedure.
After opening the unit door, loosen the two screws at the
top of the device panel. Slide the panel 1/2inch left to
permit it to swing down for access. See Figure 32. With
the peen end of a ball-peen hammer or with a drift or
chisel, remove the desired knockout.
I.B. 8926-1
Fig. 29 Unit Locked in Detent Position
Fig. 30 Operating Handle Linkage Adjustment
- Page 22 -
Hide quick links:
Advertisement
Table of Contents
