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GEK-1253E
The relay should be mounted on a vertical surface.
The outline and panel-
drilling diagram is shown in Figure 12.
Unless mounted on a steel panel that adequately grounds the relay case, it is
recommended that the case be grounded through a mounting stud or screw with a
conductor not less than #12 B&S gage copper wire or its equivalent.
CONNECTIONS
The internal-wiring diagrams for the CHCllA and CHCllB relays are shown in
Figures 9 and 10. A typical external-wiring diagram is shown in Figure 11.
MAINTENANCE
PERIODIC TESTING
It
is recommended that a mechani ca 1 inspection and an operat i ona 1 test be
performed at least annually, and if possible at the same time associated equipment
is tested.
The interval of time may vary, depending on the relative importance of
individual protective equipment, and the exposure to unfavorable conditions, such
as extreme heat, moisture or fumes.
Dust and dirt may contaminate the relay when
the protective cover is removed.
Periodic tests consist of checking:
the contacts for corrosion and pitting;
the bearings for dust and dirt; the relay calibration.
SERVICING
Contact Cleaning
For cleaning fine silver contacts, a flexible burnishing tool should be used.
This consists of a flexible strip of metal with an etCh-roughened surface,
resembling in effect a superfine file.
The polishing action is so delicate that no
scratches are left, yet corroded material will be removed rapidly and thoroughly.
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.
Knives
or
files
may
leave
scratches,
which
increase
arcing
and
deterioration of the contacts.
Abrasive paper or cloth may leave minute particles
of insulating abrasive material in the contacts, thus preventing closing.
The burnishing tool described above is included in the XRT relay tool kit that
is obtainable from the factory.
Bearings
The lower jewel of the cup unit should be checked for dust and dirt.
Clean
it if necessary, but do
not
put any type of oil on this bearing.
When finished, be
sure to tighten the set screw, observing that the cup-unit shaft endplay is 0.016
inch.
RECALIBRATION
The relays are adjusted at the factory, and it is advisable not to disturb the
adjustments except for the changes covered in the SETIINGS sect ion.
If for any
10
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