Mechanical Inspection; Electrical Tests - GE IAV53E Instructions Manual

GEH-1814
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) and that they are properly formed (see Figure 9).
MECHANICAL INSPECTION
1. On relays that have time dials, the dials will be set at zero (0) before the relay leaves
the factory. It is necessary to change this setting in order to open the relay contacts.
2.
On all relays with locked time dials, make sure the two time-dial locking screws are
tight. These locking screws are to prevent the dial from moving when the relay is
subjected to high operating torque.
3.
The moving contact should be fastened securely in its support and should engage the
stationary contact about in the middle, or at least 1/16 inch inside, the periphery of
the stationary contact.
4. The stop-arm leaf spring should deflect about 1/64 inch and the stop arm should clear
the molded block by at least .020 inch.
5.
Any foreign material must be cleared out of all air gaps. Clearance between the disk
and either the drag magnet or U-magnet should be at least 0.010 inch for any
position of the disk.
6
End play of the disk should be from 0.005 inch to 0.010 inch. End play should not be
so great as to allow the disk to strike the U-magnet or the drag magnet. Check that
top and bottom pivot and bearing screws are tight.
7.
There should be no noticeable friction in the rotating structure.
8.
Rotate the time dial to the zero position (0). Check by means of a neon lamp that the
contacts just close. There should be approximately 1/32 inch wipe on the stationary
contact. If the contact does not close, adjust the disk position by backing off the two
clamping screws on the stop arm and rotating the stop arm relative to the cutout in
the disk. This provides a coarse adjustment. Retighten the clamping screws.
For fine adjustment of contact closing, run the stationary contact brush in or out by
means of its adjusting screw, after this adjustment, check that the screw is held firmly
in its support.
9.
On double-throw relays, the support post of the upper spring should clear the
insulating plate by at least 1/64 inch.
ELECTRICAL TESTS
A. 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. In this way any magnetic effects of
the enclosure will be accurately duplicated during testing. A relay may be tested
without removing it from the panel by using a 1 2XLA1 3A test plug. This plug makes
connections only with the relay, and does not disturb any shorting bars in the case. Of
course, the 12XLA12A test plug may also be used. Although this test plug allows
greater testing flexibility, it also requires CT shorting jumpers and the exercise of
greater care, since connections are made to both the relay and the external circuitry.
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