GEK-49865
A C CEPTANCE TESTS
Immediately upon receipt of the relay, an inspection and acceptance test should be
made to make sure 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.
Si nee most operating companies use different procedures for acceptance and for
installation tests, the following section includes all applicable tests that may be
performed on these relays.
V ISUAL INS PE C T ION
Check the nameplate to make sure 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.
MECHAN ICAL INSPE C TION
1.
There should be no noticeable friction when the disk is rotated slowly
clockwise. The d isk should return by itself to its rest position.
2.
Make sure the control spring is not deformed, nor its convolutions tangled or
touching each other.
3.
The armature and contacts of the seal-in unit, as well as the armature and
contacts of the instantaneous unit, should move freely when operated by hand;
there should be at least 1/64 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.
5.
Make sure that the brushes agree with the appropriate internal connection
diagram (see Figures 3, 4, or 5).
6.
CAUTION:
Should there be a need to tighten any screws, DO NOT OVERTIGHTEN, to
prevent stripping.
7.
CAUTION: Do not use hydrocarbons to clean the cover.
DRAWOUT RELAY TEST ING
IFV relays may be tested without removing them from the panel, by using either the
12XCA28A1 or 12XCA11A1 test probes.
The test probes make connections to both the
relay and external circuitry, providing maximum flexibility.
The test probes are
different in the number of connections that can be made. The 12X CA28A1 has a full
complement of 28 connections, and the 12XCA11Al has four. Refer to instruction book
GEK-49803 for additional information.
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