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Immediately upon receipt of the relay, an inspection and acceptance test should be
made to make sure that no damage has been sustained in shipment and that the relay
calibrations have not been disturbed.
readjustment is necessary, refer to the section on
VISUAL INSPECTION
Check the nameplate stamping to make sure that the model number and rating of the
relay agree with the requisition.
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.
MEC HANICAL INSPECTION
1.
There should be no noticeable friction in the rotating structure of the relay
unit.
2.
Make sure the control springs are not deformed.
3.
With the relay leveled in its upright position, the left-hand contact should be
open and the right-hand contact should be closed.
4.
Check the location of the contact brushes and shorting bars in the case and
cradle blocks against the internal connection diagram for the relay ( Figure 5).
5.
Check the vertical end play of the moving contact and shaft assembly.
should be between 1/64 inch and 1/32 inch.
6.
The contact gap should be approximately 3/64 inch.
7.
The contact wipe should be 0.004 inch to 0.009 inch.
If there is reason to believe that the jewel is cracked or dirty, the screw assembly
can be removed from the bottom of the unit and examined under a microscope, or the
surface of the jewel explored with the point of a fine needle.
jewel, have the top pivot engaged in the shaft while screwing the jewel screw.
All nuts and screws should be tight.
The felt gasket on the cover should be securely cemented in place in order to keep
out dust.
All contact surfaces should be clean.
Every circuit in the drawout case has an auxi 1 iary brush; this is the
short one in the case
plug should engage first.
a shortin g bar, make sure these auxiliary brushes are bent high enough to
engage the connection plug or test plug before the main brushes
case do; otherwise the CT secondary circuit may be opened
n
1
GEK-65525
ACCEPTANCE TESTS
If the examination or test indicates that
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not in the cradle
On every current circuit or other circuit with
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before the circuit is completed from the plu g t o
8
SERVICING.
that the connecting plug or test
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where one brush
It
When replacing a
in
the
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