Page 9
Stop
Crank
Adjustable
Radius Crank
Tra
il
Rad
ius
Bearing
Assembly
Stop Bolt
Fig. 11 Interphase Linkage
Fig. 12 Interphase Linkage
A
B
C
D
E
The Adjustable Radius Crank
is located on the offset bearing. It is used to adjust the total degrees of
opening or closing of the switch and to increase or decrease the toggle pressure.
If the toggle pressure is the same in the open and closed positions, and the switch doesn’t open and close all
the way. Then, lengthen the adjustable radius crank. If the toggle is too hard in both directions, then
shorten the adjustable radius crank.
Note: you will see some deflection in the structural members when the crank crosses the dead center
position.
Step 14—Install Interphase Rods
The Interphase pipe operates the three phases in unison. The interphase pipe should be installed after the
drive phase is adjusted for proper open and closed blade positions and toggle.
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.
The vernier adjustment is for fine tune adjusting. If major adjustment is required, make changes at the end
phase coupling assemblies.
Interphase pipe “D”
•
Shortening the interphase pipe between phase “A” and the center phase will close the switch more and
open the switch less.
•
Lengthening the interphase pipe will open the switch more and close the switch less.
Interphase pipe “E”
•
Shortening the interphase pipe between phase “C” and the center phase will close the switch less and
open the switch more.
•
Lengthening the interphase pipe will open the switch less and close the switch more.
