GEK�45376
Reset
Tne unit resets at
90
percent of the m1n1mum closing current. Reset times are proportionate to the
time-dial settings.
The time to reset to the number
1 0
time-dial position when the current is reduced to
zero is approximately 75 seconds for the IFC66 relays.
HI -SEISMIC INSTANTANEOUS UNIT
The instantaneous unit has a 25-to-l range with a tapped coil. There are high and low ranges, selected
by means of a link located on the top of the support structure.
See Figure l. The time-current curve for
the instantaneous unit is shown in Figure
1 3 .
HIGH
DROPOUT
INSTANTANEOUS UNIT
The high drooout instantaneous unit has a 4-to-l range with a tapped coil.
There are high and low
ranges selected by means of a movable lead in the rear of the relay.
See Figure 2. The time-current curve
is shown in Figure
1 3 .
HI-SEISMIC TARGET AND SEAL-IN UNIT
The target and seal-in unit has two tap selections located on the front of the unit. See Figure
1.
RECEIVING, HANDLING AND STORAGE
These relays, when not included as a part of a control panel, will be shipped in cartons designed to
protect them against damage.
Immediately 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 company 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 immediately, they should be stored in their original cartons in
�
a
place that is free from moisture, dust and metallic chips. Foreign matter collected en the outside 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 insure 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 to insure 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 parts or any other signs of
physical damage.
MECHANICAL INSPECTION
1 .
There should be no noticeable 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 instantan
eous units should move freely when operated by hand, there should be at least l/64 inch wipe on
the seal-in and the instantaneous contacts.
4.
The targets in the seal-in unit and in the instantaneous unit must come into view and latch when
the armatures are operated by hand and should unlatch when the target release button is operated.
9
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