I.L. 41-759.2D
3
ARS Relay
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
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.
Table 3:
Maximum Circuit Delay Time
Input
(dc volts)
Voltage
Applied
Delay
Time in
Milliseconds
20
15 volts
.090
Table 4:
AR Unit Contact Bounce
Contact Loading
Effective Bounce Time
in Milliseconds
Normally
Open
Normally
Open
Dry Circuit
10 Watt (one AR relay)
Breaker Trip Coil
2
1
0.2
6-8
--
--
Table 5:
Contact Interrupting Capability
(Amperes)
dc
Voltage
Resistive
Load
Inductive
Load
Will
Interrupt
Will
Interrupt
250
125
48
0.2
0.5
1.5
0.1
0.25
1.0
