Acceptance Tests; Visual Inspection; Mechanical Inspection; Drawout Relays General - GE IAC66K Instructions Manual

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 immediately, they should be stored in their original cartons in a
place that is free from moisture, dust, and metallic chips.
case may find its way inside when the cover is removed and cause trouble in operation of the relay.
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.
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.

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.
MECHANICAL INSPECT ION
1. There should be no noticable friction when the disk is rotated slowly clockwise. The disk should
return by itself to its rest position.
2. Make sure the control spring is not deformed nor its convolutions tangled or touching.
3. The armature and contacts of the seal-in unit as well as the armature and contacts of the instan­
taneous units should move freely when operated by hand; there should be at least l/32 inch wipe on
the seal-in unit and both instantaneous unit contacts.
4. The targets in the seal-in unit and in the standard instantaneous unit must come into view and latch
when the armatures are operated by hand and should unlatch when the target release lever is operated.
5. Make sure that the fingers and shorting bars agree with the internal connections diagram.
CAUTION:
EVERY C IRCUIT IN THE DRAWOUT CASE HAS AN AUXILIARY BRUSH.
CIRCUITS AND OTHER C IRCUITS WITrl SHORTING BARS THAT THE AUXILIARY BRUSH BE BENT HIGH ENOUGH TO ENGAGE THE
CONNECTING PLUG OR TEST PLUG BEFORE THE MAIN BRUSHES DO.
BEING OPENED. SEE FIG.

DRAWOUT RELAYS GENERAL

Since all drawout relays in service operate in their cases, it is recommended that they be tested in
their cases or an equivalent steel case.
accurately duplicated during testing. A relay may be tested without removing it from the panel by using a
l2XLA13A test plug. This plug makes connections only with the relay and does not disturb any shorting bars
in
the case.
The 12XLA12A test plug may also be used.
it
flexibility, requires CT shorting jumpers and the exercise of greater care, since connections are made to
both the relay and the external circuitry.
POWER REQUIREMENTS GENERAL
All alternating-current operated devices are affected by frequency.
can be analyzed as a fundamental frequency plus harmonics of the fundamental frequency, it follows that
alternating-current devices (rel ays) will be affected by the applied waveform.
in
Therefore, order to properly test alternating-current relays it is essential to use a sine wave of
current and/or voltage.
as a finite number for any particular relay, however, any relay using tuned circuits, R-L or RC networks,
or saturating electromagnets (such as time-overcurrent relays) would be essentially affected by non­
sinusoidal wave forms.

ACCEPTANCE TESTS

6.
In this way, any magnetic effects of the enclosure will be
The purity of the sine wave (i.e. its freedom from harmonics) cannot be expressed
GEK-44233
Foreign matter collected on the outside of the
IT IS ESPECIALLY IMPORTANT ON CURRENT
THIS WILL PREVENT CT SECONDARY CIRCUITS FROM
Although this test plug allows greater testing
6
Since non-sinusoidal waveforms
If the