Acceptance Tests; Holding Coils; Control And Lead-In Spring; Clutch - 12Cap15B(-)A - GE CAP15A Instructions Manual

GEI-12083
5. The contact plate is secu~ed to the stator by means of three screws. The screws are located on
the right-hand and left-hand sides in the front and at the middle at the rear. Remove the three
screws.
6. The shaft rotor and top bearing plate will now lift out of the stator as the contact plate is raised.
7. The rotor may be removed from the shaft by loosening the two set screws which fit into V-holes
in the shaft.
The two stator castings are permanently fastened together with the laminations clamped between them,
and the faces of the poles and the cylindrical surfaces on these castings are then machined true about
the same axis. To preserve this alignment, the large rivets in the corners should never be removed.
Use care in handling the rotor while it is out of the relay, and see that the air gap and rotor are
kept clean.
In reassembly, the rotor will go into the air gap easily without forcing, if the parts are held in
proper alignment.
The lower-jewel bearing should be screwed all the way in until its head engages the end of the
threaded core. The upper bearing should be adjusted to allow about 1/64 inch to 1/32 inch end play to
the shaft.
To check the clearance between the iron core and the inside of the rotor cup, press down on the
contact arm near the shaft and thus depress the spring-mounted jewel until the cup strikes the iron. The
shaft should move about 1/16 inch.
The lower jewel may be tested for fractures by exploring its surface with a fine needle. If replaced
with a new jewel a new pivot should be screwed into the end of the shaft at the same time.
ACCEPTANCE TESTS
The contact gap may be adjusted by loosening slightly the same screw at the front of the contact
block as mentioned previously. The screw should be loose enough only to allow the contact barrel to ro-
tate in its sleeve.
The time curves of Figure 1-lA were taken with a contact gap of 0.018 inch. This gap may be obtained
in the following manner: With the right-hand contact tube or barrel secured in place, turn the left-hand
barrel in the opposite direction approximately 210 degrees or 0.6 revolutions from contact closing.Tighten
the screw which secures the barrel.
Each moving contact may be removed by loosening the screw which secures it to the contact arm and
sliding it from under the screw head.
HOLDING COILS
The location of each holding coil may be adjusted by loosening the mounting screw and sliding the
coil either to the left or the right in a groove provided for that purpose. The holding coils are located
in the factory so that there is a gap of aboutO.055 inch between the pole pieces and the armature. The 0.055
inch is equivalent to 1-5/B turns of the contact barrel.
CONTROL AND LEAD-IN SPRING
The control and lead-in springs are adjusted in the factory to close the right-hand contact when the
relay is de-energized. The closing spring torque is equivalent to about 45 degrees motion of the spring
adjusting ring located just under the top bearing plate. The tension of the control spring may be changed
by loosening the hexagonal screw located at the rear of the adjusting-ring to the desired position.
CLUTCH - 12CAP15B(-)A
The clutch adjusting screw should be tightened as much as possible so that the clutch does not slip.
:LUTCH-12CAP15A(-)A
Connect the relay per Figure BA. Apply rated voltage and current to the relay and set the phase angle
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