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GEK-49850
INSTANTANEOUS UNIT (NON-DIRECTIONALLY CONTROLLED)
This IOC unit is a small hinged armature type instantaneous element and is mounted on the right side
of the TOC unit.
The IOC element operates over a 25—to-one total range obtained by using a tapped coil
which has a five-to-one low range and a five-to—one high range; this combination provides the 25—to—one
total range.
When the current reaches a predetermined value, the instantaneous element operates closing
its contact circuit and raising its target into view.
The target latches in the exposed position until
it is released.
The same button that releases the target seal—in unit also releases the target of the
instantaneous unit.
RECEIVING, HANDLING AND STORAGE
These relays, when not included as part of a control panel will be shipped in cartons designed to pro
tect them against damage.
Imimediately upon receipt of a relay, examine it for any damage sustained in
transit.
If injury or damage resulting from rough handling is evident, file a damage claim at once with
the transportation conipany and promptly notify the nearest General Electric Apparatus Sales Office.
Reasonable care should be exercised in unpacking the relay in order that none of the parts are injured
or the adjustments disturbed.
If the relays are not to be installed ininediately, they should be stored in their original cartons
in a place that is free from moisture, dust and metallic chips. Foreign matter collected on the outside
of the case may find its way inside when the cover is removed and cause trouble in the operation of the
relay.
ACCEPTANCE TESTS
Immediately upon receipt of the relay an inspection and acceptance test should be made to ensure that
no damage has been sustained in shipment and that the relay calibrations have not been disturbed.
If the
examination or test indicates that readjustment is necessary, refer to the section on SERVICING.
These tests may be performed as part of the installation or acceptance tests at the discretion of
the user.
Since most operating companies use different procedures for acceptance and installation tests, the
following section includes all applicable tests that may be performed on these relays.
VISUAL INSPECTION
Check the nameplate stamping to ensure 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.
Check that the shorting bars are in the proper
location(s) as shown by the internal connections diagram, Figs. 5 to 7 inclusive and that the main brush
is properly formed to contact the shorting bar.
MECHANICAL INSPECTION
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1.
The rotating shaft end play should be 0.015—0.020 inch.
2.
The contact gap should be 0.028-0.036 inch.
3.
There should be no noticeable friction in the rotating structure.
4.
With the relay well leveled and in its upright position, the contact should be open and resting
against the backstop.
Middle Unit (TOC)
1.
The disk shaft end play should be 0.005-0.015 inch.
2.
The disk should be centered in the air gaps of both the electromagnet and drag magnet.
3.
Both air gaps should be free of foreign matter.
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