GEK-65525
SERVICING
If it is found during installation or periodic testing that the relay is out of
calibration, recalibrate as follows:
RELAY CONTACTS
Checks and Adjustments
The clearance between (a) the back of the silver stationary contact mounted on the
flat spiral, and (b) the diaphragm behind it, should be 0.004 inch to 0.009 inch.
This wipe should be measured by moving the contact arm over until it just touches
the appropriate stationary contact. Then, holding the contact arm in this position,
rotate the barrel until the back of the contact touches the diaphragm. Rotating the
barrel 450 corresponds to 0.004 inch wipe, while 1050 is the equivalent of 0.009
inch.
The contact gap may be adjusted by loosening slightly the screw at the front of the
contact block. The screw should be loosened only enough to allow the contact barrel
to rotate in its sleeve.
The contact gap should be 3/64 inch.
This should be adjusted in the following
manner:
with the contact arm parallel to the sides of the relay, turn the contact
barrels until both contacts are just made (use neon lamps to verify).
Tighten the
clamping screw, locking the right-hand barrel.
Back off the left-hand contact
barrel 1� revolutions (5400) and tighten its clamping screw.
To change the stationary contact mounting spring, loosen the screw at the front of
the contact block, then remove the contact barrel and sleeve as a complete unit.
Unscrew the cap (E).
The contact and its flat spiral mounting spring may then be
removed. See Figure 6.
The moving contact may be removed by loosening the screw that secures the moving
contact to the contact arm and sliding the contact from under the screw head.
Contact Cleaning
A flexible burnishing tool should be used for cleaning relay contacts.
This is a
flexible strip of metal with an etched-roughened surface, which in effect resembles
a superfine file.
The polishing action of this file is so delicate that no
scratches are left on the contacts, yet it cleans off any corrosion thoroughly and
rapidly.
The flexibility of the tool ensures the cleaning of the actual points of
contact.
Fine silver contacts should not be cleaned with knives, files, or abrasive paper or
cloth.
Knives or files may leave scratches that increase arcing and deterioration
of the contacts.
Abrasive paper or cloth may leave minute particles of insulating
abrasive material in the contacts and thus prevent closing.
The burnishing tool described above can be obtained from the factory.
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