GEH-12668
Type
IAV
Undervoltage and Overvoltage Relays
Maintenance
These relays are adjusted at the factory and it is
advisable not to disturb the adjustments. If, for any
reasons, they have been disturbed, the following
points should be observed in restoring them:
Disk and Bearings
The lower jewel may be tested for cracks by ex
ploring its surface with the point of a fine needle.
If it is necessary to replace the jewel, a very small
drop of G-E meter jewel oil; Cat. No.
66X728
should
be placed on the new jewel before it is inserted. 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.
Contacts (Cleaning)
If the contacts become dirty or slightly pitted,
they should be cleaned by scraping the surface
lightly with a sharp knife or by using a fine clean
file. Under no circumstances should emery or crocus
cloth be used on fine-silver relay contacts. Finish
by wiping the contacts with a clean, soft cloth and
avoid touching them with the fingers.
:-Jame of Part
Periodic Testing
An operation test and inspection of the relay at
least once every six months are recommended. Test
connections are shown in Fig.
12
and
13.
Renewal Parts
It is recommended that sufficient quantities of
renewal parts be can ied in stock to enable the
prompt replacement of any worn, broken, or dam
aged parts. Those most subject to wear in ordinary
operation and to damage due to possible abnormal
conditions are listed below. For illustration of parts
see Fig.
14
and
15.
Ordering Directions
When ordering renewal parts, address the nearest
Sales Office of the General Electric Company, specify
quantity required, name of part wanted as shown
by Fig.
14
and
15
and give complete nameplate data,
including serial number. If possible give the General
Electric Company's requisition on which the relay
was furnished.
Quantity
per Relay
Recommended Stock
1
Relay
5
Relays
Coil, l\Iagnet, and Tap-block Assembly ........................ .
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
2
2
2
1
1
1
l\lain :\loving Contact and Carrier.
. .......
.
......
. .
.
. .
.. .
:\lain Stationary Brush and Contact Tip Assembly ... .
Seal-in Element Holding Coil. . .
. .
. . .
.
.
..
.
..
.
Seal-in Element Stationary Contact Right .. .
Seal-in Element Stationarv Contact Left ...
.
Seal-in Element :\loving Contact Assembly.
Lower J ewe! Screw ... .
Top Pivot .. ........... .
Disk and Shaft ........ .
APPARATUS DEPARTMENT
GENERAL
.
ELECTRIC
SCHENECTADY, N. Y.
8-48 (6500)
Supersedes GEH-1266A
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