Visual Inspection; Mechanical Inspection; Cradle And Case Blocks; Target Seal-In Unit (Spa 11 B And 12B) - GE SPA11A Instructions Manual

VISUAL INSPECTION

Check the nameplate stamping to make sure that the model number and rating of the
relay agree with the requisition. Check that the model number on the label in the back of
the case agrees with the nameplate.
Remove the relay from its case and check that there are no broken or cracked molded
parts or other signs of physical damage, and that all screws are tight.

MECHANICAL INSPECTION

Cradle and Case Blocks

Check that the fingers on the cradle and the case agree with the internal connection
diagram. Each cradle finger should be flush or project above the barrier between fingers.
Check that there is a coil spring under each finger. The case fingers, if not held down by a
shorting bar, should come within one-sixteenth (1/16) of an inch of touching a straight
edge bridging the case block from side to side. If a finger is held down by a shorting bar, it
should require at least one pound of force (450 grams) to open the electrical circuit
between the finger and the shorting bar. See Figure 13. Check that each auxiliary brush
extends above the barrier between fingers.
Pick up the armature by hand. The orange target should appear. When the armature
is released, the target should remain in view. Push in on the reset arm. The target should
drop from view.
Hold the armature up by hand. The target should not be at the end of its travel.
Verify this by reaching in one of the windows of the target with a sharp instrument, such as
a knife or scribe, and pushing upward. The target should move definitely upward (at least
one sixty-fourth of an inch, or 0.4 millimeter). Release the armature. The target should fall
visibly downward (at least 0.010 inch or 1/4 millimeter) before the target is caught by the
latch.
Observe each telephone relay in the de-energized position. Check that each normally
open contact has a gap spacing of at least 0.010 inch or 0.25 millimeter. Check that each
normally-closed contact has a contact pressure of at least five grams {Sg) by deflecting the
stationary contact away from the moving contact with a force gage.
Operate each telephone relay by pressing on the armature. In the operated position,
check that each normally closed contact has at least 0.010 inch (0.25 millimeter) gap. Check
that each normally open contact has at least 0.005 inch (0.13 millimeter) of overtravel after
contact, by observing that the contact still closes with a 0.0025 inch (0.06 millimeter) shim
inserted between the armature and pole piece.

ELECTRICAL INSPECTION

The correct operation of the contacts may be verified by manually operating the
telephone relays and monitoring the contacts with an ohmmeter.
GEK-65512
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