Advertisement
TYPE KS RELAY-------- -------------- -------------- -------------- ----------� I .= L .� 4 � 1 �· 4 � 92 � ·� 1 A
PRIM ARY
F ig. 2.
Compe nsator Construction
Cylin ' d er Unit
The device which acts to initiate blocking is a
four-pole
cylinder unit which is connected open
delta and operates as a three-phase induction motor.
Contact-closing torque is produced by the unit when
the voltage applied to its terminals has a positive
phase sequence. Contact-opening torque is produced
when
negative-phase
sequence
plied. H ence, the cylinder unit has restraint or oper
ating torque as determined by the phase sequence
of th e voltages applied to its terminals.
Mechanically, the cylinder unit is composed of
four basic components: a die-cast aluminum frame,
an electromagnet, a moving element assembly, and a
molded bridge.
The frame serves as the mounting structure for
the magnetic core. The magnetic core which houses
the lower pin bearing is secured to the frame by a
locking nut. The bearing can be replaced, if neces
sary, without having to remove the magnetic core
from the frame.
The
electromagnet
coils mounted diametrically opposite one another, to
excite each set of poles, and two locating pins. The
L AMI N AT E D
CORE
849A034
voltages are ap
has
two series-connected
Y
TELEPHONE REU.
500 D
..a Y.D.C.
2000 D
12S Y.D.C.
•
16&00 a . 250 v.o.c.
•
CHASSIS OPERATED
SHORTIItG SWITCH
Fig. 3.
Internal Schematic of the Type KS R elay in FT32
Case.
locating pins are used to accurately position the
lower pin bearing, which is mounted on the frame,
with respect to the upper pin bearing,
threaded
into
the
bridge.
secured
to
the frame by
The
moving element assembly consists of a
spiral spring, contact carrying member, and an alum
imum cylinder assembled to a molded hub which
holds the shaft. The shaft has removable top and
botto m jewel bearings. The shaft rides between the
bottom pin bearing and the upper pin be ar ing which
is adjusted to . 025 inch from the top of the shaft
bearing. The cylinder rotates in the air gap formed
by the electromagnet and the magnetic core. The
stops for the moving element contact arm are an
integral part of the bridge.
The bridge is secured to the electromagnet and
frame by two mounting screws. In addition to hold
ing the upper pin bearing, the bridge is used for
mounting the adjustable stationary contact housing.
The stationary contact housing is held in position
by
a spring type clamp.
located on the underside of the bridge and is at
tached to the moving contact arm by a spiral spring.
The spring adjuster is also held in place by a spring
type clamp.
TEST SWITCM
TERMINAl.
183A583
which is
The
electromagnet is
four mounting screws.
The spring adjuster is
3
Advertisement
