Acceptance Tests - GE NBVllA Series Instructions Manual

Reasonable care should be exercised in unpacking the relay in order that none of the
parts are in jured nor the ad justments 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,
Foreign matter collected on the outside of the case may find its way inside when the
cover is removed, and cause trouble in the operation of the relay.
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.
Visual Inspection
Check the nameplate
calibration range of the relay received agree with the requisition.
Remove the relay from its case, and check by visual inspection that there are n o
broken or cracked molded parts or other signs of physical damage,
screws are tight.
Mechanical Inspection
It is recommended that the telephone-type relay be checked as follows:
With the telephone-type relay de-energized, each normally-open contact should have a
.010-.015
gap of
deflecting the stationary
.005
approximately
The wipe on each normally-open contact should be approximately
be checked by inserting a
piece and operating the armature by hand.
before the residual screw strikes the shim.
the normally-closed contact should have a gap of
Electrical Tests
If the relay has not been damaged in shipment, it is very unlikely that the relay
adjustments have been disturbed.
following electrical tests should be made.
1.
Balanced three-phase tests
Connect a balanced
frequency and good wave form to the relay, as shown in Figure
voltage across relay studs
per volt or more).
208
volt relay, and
ACCEPTANCE
stamping to make
inch. Observe the
contact
inch.
.005
inch shim between the residual screw and the pole
Where evidence of rough handling is observed, the
three-phase
3
and
The voltage observed should be less than
1.0
volts for a
GEI-50261
TESTS
sure that the
wipe on each
member towards the
Th e normally-open contacts should make
When the telephone relay is picked up,
.010
to
voltage of correct
4
with a high-resistance voltmeter
120
volt relay.
8
dust and metallic chips.
model number, rating
and that all
normally-closed contact
frame. Wipe should
.005
inch.
0.15
inch.
phase sequence,
7,
and check the
(1000
1.5
volts for a
and
by
be
This can
rated
ohms