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GEI-83910
ACCEPTANCE TESTS
Immediately upon receipt of the relay, an examination and tests should be made
to make sure that no damage has been sustained in shipment and that the relay
calibrations have not been disturbed.
If the examination or tests indicate that
readjustment is necessary, refer to the section on SERVICING.
VISUAL INSPECTION
Check the nameplate to make sure that the model number, rating and calibration
range of the relay recei ved agree with the requ i sit i on.
Remove the re 1 ay from its
case and check that there are no broken or cracked molded or compound parts, and
that all screws are tight.
MECHANICAL INSPECTION
It is recommended that the following mechanical adjustments be checked:
1.
There should be no noticeable friction in the rotating structure of each unit.
The normally-closed contacts should be closed when the relay is in an upright
position.
2.
There should be an end play of from .005 to .015 inch on the shafts of the
rotat i ng structures.
The lower jewe l-screw beari ng of each unit shoul d be
screwed firmly in place, and the pivot at the top of the shaft should be
locked by its set screw.
3.
The contact gap on each unit should be approximately 0.020 inches.
4.
The target shield should drop freely when the armature is pushed against the
pole piece.
With the cover fastened securely in place, check that the target
resets positively when the reset button at the bottom of the cover is
operated.
5.
The armature and contacts of the seal-in unit should move freely when operated
by hand.
There should be at least 1/32" wipe on the seal-in contacts.
6.
Check the location of the contact brushes on the cradle and case blocks
against the internal-connection diagram for the relay
(See Figure 13).
Be
sure that the shorting bars are in the proper locations on the case blocks,
and that the long and short brushes on the cradle block agree with the
internal-connection diagram.
Figure 8 shows a sectional view of the case and
cradl e blocks with the connect i on plug in place.
Note that there is an
auxiliary brush in each position on the case block.
This brush should be
formed high enough so that when the connecting plug is inserted, it engages
the auxiliary brush before striking the main brush.
This is especially
important in current circuits and other circuits with shorting bars, since an
improper adjustment of the auxiliary brush could result in a CT secondary
circuit being momentarily open-circuited.
ELECTRICAL TESTS
Upper-Unit
Pick~~
Check that the green lead is connected to terminal #3 and that the black lead
is connected to terminal #3A.
See internal diagram Figure 13.
10
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