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I.L. 41-759.2D
3. Armature gap
The armature gap should be 0.009 inches mea-
sured at the narrowest part of the armature gap.
4. Contact operate time
Per Table 2, page 2,
Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient dc
current through the trip circuit to close the contacts of
the ICS. The operation indicator target should drop
freely.
For proper contact adjustment, insert a 0.030" feeler
gauge between the core pin and the armature. Hold
the armature closed against the core pin and gauge.
Adjust the stationary contacts such that they just
make with the moving contact. Both stationary con-
tacts should make at approximately the same time.
The contact follow will be approximately 3/64" to
5/64".
Printed Circuit Module
The following check is recommended to insure that
the circuitry on the printed circuit module is function-
ing properly.
1. Apply 15 to 20 volts to the proper supply termi-
nals, marked positive and negative on internal
schematics.
2. Apply rated voltage to each input, one at a time,
and its respective AR unit should operate (pick-
up). Remove the input and the AR unit should
drop out. The ARS relay should operate within
the times shown in Table 2 and 3. The ARS oper-
ating time is the combined time of the circuit
delay time (Table 3, page 3) plus the AR unit time
(Table 2, page 2) according to the particular con-
tact arrangement used.
7.0 CALIBRATION
Use the following procedure for calibrating the relay if
the relay has been taken apart for repairs or 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" page 3).
Tripping Relay (AR Unit)
If the type AR tripping relay unit adjustments are dis-
4
turbed or are in error, or it becomes necessary to
replace some part, use the following adjustment pro-
cedure.
a. Adjust the set screw at the rear of the top of the
frame to obtain a 0.009-inch gap at the rear end
of the armature air gap.
b. On four normally open contact relays adjust each
contact spring to obtain 4 grams pressure at the
very end of the spring. This pressure should be
sufficient to move the spring away from the edge
of the slot of the card.
On the two normally open two normally closed
contact relay, adjust each normally open contact
spring for 8 grams to just move the contact away
from the card. Adjust the normally closed contact
for 15 grams spring pressure, to just move con-
tact spring away from the card. Then adjust the
stationary contact screw to just move the contact
spring away from 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 pressure. The normally closed, if
any, should have a contact gap of .015 inches.
When calibrated as outlined above, the relay should
meet the characteristics of Table 2, page 2 and Table
4, page 3.
Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient dc
current through the trip circuit to close the contacts of
the ICS. The operation indicator target should drop
freely.
Printed Circuit Module
No calibration required other than check listed under
acceptance check.
8.0 RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to the customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data.
ARS Relay
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