3 |
P a g e
angle, and stop crank for correct position. See
Fig. 5 & 6.
If the offset bearing has an adjustable crank, it is
sometime necessary to add ¼” to ½” to the trial
radius given on the control drawing to get
required travel of switch blades. This additional
length allows for lost motion and clearances in
pin holes and will also provide a definite audible
sound accompanied by a reasonable amount of
deflection in the structural members when the
crank crosses the dead center position. This
serves as a signal to the operator that the switch
is fully closed.
Step 4—Install Interphase Rods
With all blades in the closed position, install the
interphase rods and offset crank rod as follows:
a.
Lengthen the interphase rods that are in
compression during opening, as much as
possible, yet allowing for the pins to be
inserted.
b.
On the rods that are in tension during
opening, shorten them as much as possible,
yet allowing for the pins to be inserted.
c.
The offset crank rod between the outboard
bearing and the driven switch should be
handled the same way
