TYPE AR RELAY
.3
the
0.1.
This value of current should be not
greater than the particular
0.1.
tap setting being
used. The operation indicator target should drop
freely.
6. Indicating Contactor Switch (ICS) (When Supplied)
Close the main relay contacts and pass sufficient
de current through the trip circuit to close the
contacts of the ICS. This value of current should
be not greater than the particular ICS tap setting
being used. The operation indicator target should
drop freely.
The contact gap should be approximately .047"
between the bridging moving contact and the
stationary contacts. The bridging moving contact
should touch
the stationary contacts simulta
neously.
CALIBRA TION
Use the following procedure for calibrating the
relay if the relay has been taken apart for repairs of
the adjustments disturbed. This procedure should
not be used until it is apparent that the relay is not
in proper working order. (See "Acceptance Check.")
Tripping Relay (AR)
The type AR tripping relay unit has been properly
adjusted at the factory to insure correct operation,
and under normal field conditions should not require
readjustment. If, however, the adjustments are dis
turbed in error, or it becomes necessary to replace
some part, use the following adjustment procedure.
This procedure should not be used until it is
apparent that the relay is not in proper working order.
a. Adjust the set screw at the rear of the top of the
frame to obtain a 0.010-inch gap at the rear end
of the armature air gap.
b. Adjust each contact spring to obtain 5 grams
pressure at the very end of the spring. This pres
sure should be sufficient to move the spring
away from the edge of the slot of the card.
c. Adjust each stationary contact screw to obtain a
contact gap of 0.020 to 0.022 inches for the nor
mally open contacts. Energize the relay and the
normally open contacts should have 15 to 30
grams contact follow.
d. Apply rated voltage to the relay in line with the
terminal polarity designation. Then calibrate by
adjusting the spring tension until the relay picks
up in line with TABLE III.
TABLE III
31 volts for 48 volt rating
80 volts for 125 volt rating
160 volts for 25 0 volt rating
RE NE WAL P AR T S
Repair work can be done most satisfactorily at
the factory. However, interchangeable parts can be
furnished to the customers who are equipped for
doing repair work. When ordering parts, always give
the complete name plate data.
TABLE IV
CONTACT INTERRUPTING CAPABILITY (AMPERES)
RESISTIVE LOAD
INDUCTIVE LOAD
D.C. VOLTAGE
WILL INTERRUPT
WILL INTERRUPT
250
0.2
0.1
125
0.5
0.25
48
1.5
1.0
5
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