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P a g e
without any noticeable difference. Refer to
installation drawing for intended of preferred
positioning of jaw and blade end.
Note: The counterbalances are assembled at the
factory for the mounting positions as required
for each installation. If it is necessary to change
the mounting position of the switch in the field,
the counterbalance must be changed as well.
Step 5—Switch Blade Adjustment
In the switch closed position, the moving contact
of the blade should come to rest nearly midway
on the contact portion of the jaw contacts, Fig. 4.
Use the shims or leveling screws (which ever are
furnished) between the base of the rotor bearings
and the switch base, to achieve the proper blade
penetration into the jaw. After this adjustment
the insulator stacks may be slightly out of plumb
when the switches open but well within the
tolerances with the switch closed.
With the switch contacts closed as described
above, the connecting rod should be adjusted so
that there is neither tension nor compression in
the rod. Adjustment may be made by removing
the pin at the attachment point of crack and
clevis, loosening the locknut, screwing the clevis
in or out to adjust the length until the proper
length is obtained. The locknut is then tightened
and final assembly of the pin is made to attach
clevis and crank.
After this has been accomplished, the closed
position stop bolt (A) Fig. 5 is set so that it
engages the mating projection (B) on the crank.
Then, move the switch to the fully open position
and adjust the one position stop bolt (C) in the
same manner.
This procedure applies to each single pole.
Step 6—Mount Switches
Assemble the switches on the supporting
structure in accordance with the positions shown
on the installation drawing. The switches
should be mounted level and parallel with each
other. In case of a warped structure, shimming
under the switch bases may be required.
Step 7—Mount Offset Bearing
For those installations requiring an offset
bearing, mount the offset bearing and its
supporting base on the structure in the position
shown on the installation drawing. Check
operating crank for proper length radius and
Fig. 6 Operating Pole Multi-angle Crank
Summary of Contents for DR7
Page 1: ...IB DR7 A May 2012 ...
