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Fig. 8 Operating Handle Lock Plate
Step 12—Install Operating Mechanism
Two types of manual operating mechanisms
are available for the TTR8 Switch:
•
Swing-handle operator
•
Worm gear mechanism
A motor operator also can be supplied for
remote operations.
Swing Handle Operator
To install the swing handle operator:
1.
With ground strap in place on vertical
operating pipe, slide handle and handle lock
plate over the end of the vertical operating
pipe
2.
Fasten the lock plate at the proper location.
Recommended height for the lock plate is 3 ft.
6 in. above ground.
Note:
The lower end of the vertical operating
pipe should extend through the lock plate at
least 3 inches. It may extend as much as 3 feet
or more, just so it doesn’t touch the ground or
column footing.
3.
The lock plate assembly (Fig. 8) consists of
two castings, mounted on the pipe guide plate,
which can be easily adjusted in an arc to
provide the required rotation. These act as
locks for the manual operating handle when it
is dropped from the operating position. The
handle must be raised to a horizontal position
for operation.
4.
With the switch in the fully closed position,
set the handle clamp so its set screws are 4
inches above the lock plate and its vertical
centerline is at or near as possible to the closed
position, see Fig. 8.
5.
Temporarily fasten the handle to the pipe with
the set screws.
Worm Gear Mechanism
1.
With ground strap in place on vertical operating
pipe, slide worm gear mechanism over the
vertical operating pipe and attach it to the
structure.
2.
Remove the small position indicators, which are
attached to the worm gear coupling with Allen
set screws.
3.
Tighten hex head set screws in the coupling
until the vertical operating pipe is pierced.
4.
If all stops at switch elevation have been set,
including the offset bearing, then it is safe to
reinstall the position indicators on the worm
gear mechanism. These indicators should not
quite touch the raised boss on the worm gear
housing in either the open or closed position.
There is a possibility of damage to the
indicators or the coupling if this is not observed
Motor Operator
For remote operation, a motor operator is supplied
and it should be installed per the instructions
supplied with it.
Step 13—Adjust Drive Phase
With the interphase linkage disconnected, make
adjustment to the offset rod and offset bearing to
obtain your fully open and closed positions, and
toggle on your offset bearing. Details of adjustment
are discussed on the next page.
