GE IAV51A Instructions Manual page 13

If
it is necessary to replace the jewel, the jewel
should be turned up until the disk is centered in the
air gap, after which it should be locked in position
by the set screw provided for the purpose.
CONTACT CLEANING
For cleaning fine silver contacts, a flexible
burnishing tool should be used.
flexible strip of metal with an etched 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 insures
the cleaning of the actual points of contact. Some­
times an ordinary file cannot reach the actual points
of contact because of some obstruction from some
other part of the relay.
It is recommended that sufficient quantities of
renewal parts be carried in stock to enable the
prompt replacement of any of those worn, brokep. or
damaged. Parts bulletin number GEF-2149 gives a
list of those most subject to wear in ordinary oper­
ation and to damage due to possible abnormal condi­
tions.
This consists of a
RENEWAL PARTS
SEAL-IN
UNIT
INTERNAL CONNECTIONS (FRONT VIEW)
Connections Of
Fig.
15 Internal
Relay,
Voltage Relays Type IAV
Fine silver contacts
with knives, files,
Knives or files may leave scratches which increase
arcing and deterioration of the contacts. Abrasive
paper or cloth may leave minute particles of in­
sulating abrasive material in the contacts and thus
prevent closing.
The burnishing tool described above can be
obtained from the factory.
PERIODIC TESTING
An operation test and inspection of the relay
at least once every six months are recommended.
Test connections are shown in Figs. 18 and 19.
When ordering
nearest Sales Office of the General Electric Com­
pany, specify quantity required, name of part wanted
as shown by Figs. 16 and 17 and give complete
nameplate data, including serial number.
ble give the General Eelectric Company's requisition
on which the relay was furnished.
VOLTAGE
UNIT
SHORT FINGER
• •
The TJpe IAY53C
Front VIew
GEH-1814
should not be cleaned
or abrasive paper or cloth.
renewal parts, address
If
the
possi­
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