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GEI-90802
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 short fingers are in the correct location. as indicated in Figure 7.
and that the auxiliary brushes are properly adjusted (see Figure 12).
MECHANICAL INSPECTION
1.
Check that the rotating element moves without noticeable friction.
2.
Remove the time-dial locking screws and check that the moving contact just
touches the stationary contact when the time dial is set at zero (0).
The
contact wipe should be approximately 1/32". Put locking screws back in place.
3.
Check that the control spring is not deformed and that the spring convolutions
at the No. 5 time-dial setting are reasonably concentric.
4.
Check that the armatures of the telephone relays move freely.
Also. with the
telephone relays in the de-energized position, all circuit-closing contacts
should have a gap of 0.015" and all circuit-opening contacts should have a wipe
of 0.005".
Gap may be checked by inserting a feeler gage, and wipe can be
checked by observing the amount of deflection on the stationary contact before
parting the contacts. The armature should then be operated by hand and the gap
and wipe again checked as described above.
ELECTRICAL TESTS
Connect the relay as shown in Figure 10 and check the following:
1.
Check that the relay picks up with approximately the time delay shown in Figure
6 when a single-phase source of at least rated voltage is connected to both
operat i ng coil s.
2.
Check that the relay picks up at a
200
cloSing angle (or other closing angle if
used) within
~
30
when connected to a source with rated voltages on both coils.
Check zero-displacement pickup. which should agree with the value in Figure 1
within
~
10%.
3.
With both coils connected to a rated voltage source with zero displacement,
check that pickup time agrees with the values given in Figures 4 or 5
~
10%.
4.
With an adjustable 115 volt source of rated frequency, check that the
telephone-type units pick up at 50% or less of rated voltage and drop out at
15% or more of rated voltage.
To check the "L" relay, connect the voltage
source to studs 5 and 6. To check "B" relay, connect voltage to studs 8 and 9.
INSTALLATION PROCEDURE
If. after acceptance tests. the relay is held in storage before shipment to the job
site. it is recommended that the visual and manual inspections described in the
section on ACCEPTANCE TESTS be repeated before installation.
7
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