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I.L. 41-748.1F
pressure applied to the face of the moving contact
will make the arm slip one-fourth of its total free
travel. Free travel is the angle through which the hub
will slip from the condition of reset to the point where
the clamp projection begins to ride up the wedge.
The free travel can vary between 15˚ to 20˚.
The shaft has removable top and bottom jewel bear-
ings. The shaft rides between the bottom pin bearing
and the upper pin bearing with the cylinder rotating in
an air-gap formed by the electromagnet and the
magnetic core. The stops are an integral part of the
bridge.
The bridge is secured to the electromagnet and
frame by two mounting screws. In addition to holding
the upper pin bearing, the bridge is used for mount-
ing the adjustable stationary contact housing. This
stationary contact has .002 to .006 inch follow which
is set at the factory by means of the adjusting screw.
After the adjustment is made the screw is sealed in
position with a material which flows around the
threads and then solidifies. The stationary contact
housing is held in position by a spring type clamp.
The spring adjuster is located on the underside of the
bridge and is attached to the moving contact arm by
a spiral spring. The spring adjuster is also held in
place by a spring type clamp.
4
Figure 4. External Schematic of Type KLF-1 Relay
When contacts close, the electrical connection is
made through the stationary contact housing clamp,
to the moving contact, through the spiral spring and
out to the spring adjuster clamp.
2.4. DIRECTIONAL UNIT
The directional unit is an induction cylinder unit oper-
ating on the interaction between the polarizing circuit
flux and the operating circuit flux.
Mechanically, the directional unit is composed of the
same basic components as the distance unit: A
die-cast aluminum frame, an electromagnet, a mov-
ing element assembly, and a molded bridge.
The electromagnet has two series-connected polariz-
ing coils mounted diametrically opposite one another;
two series-connected operating coils mounted dia-
metrically opposite one another; two magnetic
adjusting plugs; upper and lower adjusting plug clips,
and two locating pins. The locating pins are used to
accurately position the lower pin bearing, which is
threaded into the bridge. The electromagnet is
secured to the frame by four mounting screws.
The moving element assembly consists of a spiral
spring, contact carrying member, and aluminum cyl-
inder assembled to a molded hub which holds the
shaft. The shaft has removable top and bottom jewel
292B471
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