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ARS Relay

Table 3:

Maximum Circuit Delay Time

Input

Voltage

(dc volts)

Applied

15 volts

Table 4:

AR Unit Contact Bounce

Contact Loading

Dry Circuit

10 Watt (one AR relay)

Breaker Trip Coil

Table 5:

Contact Interrupting Capability

(Amperes)

Resistive

Voltage

Interrupt

250

125

4.0 SETTINGS

No setting is required on the ICS unit except the

selection of the 0.2 to 2.0 ampere tap setting. This

selection is made by connecting the lead located in

front of the tap block to the desired setting by means

of the connecting screw.

5.0 INSTALLATION

The relays should be mounted on switchboard pan-

els or their equivalent in a location free from dirt,

moisture, excessive vibration, and heat. Mount the

relay vertically by means of the four mounting holes

on the flange for semi-flush mounting or by means of

the rear mounting stud or studs for projection mount-

ing. Either a mounting stud or the mounting screws

may be utilized for grounding the relay. The electrical

Delay

Time in

Milliseconds

.090

Effective Bounce Time

in Milliseconds

Normally

Open

6-8

0.2

Inductive

Load

Will

Interrupt

0.2

0.1

0.5

0.25

1.5

1.0

connections may be made directly to the terminals by

means of screws for steel panel mounting or to the

terminal studs furnished with the relay for thick panel

mounting. The terminal studs may be easily removed

or inserted by locking two nuts on the stud and then

turning the proper nut with a wrench.

For detailed information on the FT-11 or FT-22 case,

refer to I.L. 41-076.

6.0 ADJUSTMENTS AND

MAINTENANCE

The proper adjustments to insure correct operation of

this relay have been made at the factory and should

not require readjustment after receipt by the cus-

tomer. If the adjustments have been changed or the

relay taken apart for repairs, the instructions below

should be followed.

6.1 Acceptance Check

AR Unit

The following check is recommended to insure that

the AR unit is in proper working order.

1. Contact gaps

a. Normally open contacts should have a gap

0.018 to 0.023 inch.

b. Normally closed contact gap should be .013

minimum.

2. Contact pressure

a. On four normally open contact relays, the

normally open contacts should have approxi-

mately 4 grams pressure on the card in the

de-energized position, and 15 to 30 grams

contact pressure in the energized position.

b. On two normally open and two normally

closed relays, the normally closed contacts

should have approximately 15 grams contact

pressure in the de-energized position. Each

normally open contact spring should have

approximately 8 grams pressure against the

card.

NOTE:

For this check to be made accurately, it is necessary to back

out the NC stationary contact screw. This will disturb the fac-

tory calibration and therefore it is recommended this check

not be made on a relay which passes all other checks.

I.L. 41-759.2D