The voltage at which the contact picks up can be
varied by means of the adjustable resistor. The
time for the moving contact to r eset to the right hand
stationary contact may be delayed for a minimum o f
5
cycles (see section under "SETTINGS").
Indicating Contactor Switch Unit (ICS)
The indicating contactor switch is a small d-e
operated clapper type device. A magnetic armature,
to which leaf-spring mounted contacts are attached,
is attracted to the magnetic core upon energization
of the switch. When the switch closes, the moving
contacts bridge two stationary contacts, completing
the trip circuit. Also during this operation two
fingers on the armature deflect a spring located on
the front of the switch, which allows the operation
indicator target to drop. The target is reset from the
outside of the case by a push rod located at the
bottom of the cover.
The front spring, in addition to holding the target,
provide restraint for the armature and thus controls
the pickup value of the switch.
Contacts
The moving contact assembly in the overvoltage
unit has been factory adjusted for low contact
bounce performance and should not be disturbed.
SE TTINGS
Overvoltage Unit
(V)
The only setting required is the pickup voltage
setting which is made by means of the adjustable
resistor. Increasing the resistance will increase
the pickup voltage.
For the
15-45
volt unit, the relay as received has
been factory adjusted to pick up at the high end of
the pickup range. Pickup at the low end of the
range can be achieved by merely shorting out the
resistor.
The
108- 132
volt unit can be adjusted from
108
to
132
volts by adjusting the resistor, and is normally
set for
108
volts at the factory.
2
The contact gap is factory adjusted for
.020".
If
5
cycle minimum reset time is desired simply back
off the left-hand station contact until the moving
contact does not make in the picked up position.
INSTALLATION
The relays should be mounted on switchboard panels
or their equivalent in a location free from dirt,
moisture, excessive vibration, and heat. Mount the
relays 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 pro
jection mounting. 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 the terminal studs furnished
with the relay for thick panel mounting. The ter
minal studs may be easily removed or inserted by
locking two nuts on the stud and then turning the
proper nut with a wrench.
AD
J
US T ME N T S
&
M A I NT E N AN CE
The proper adjustments· to insure correct operation
of this relay have been made at the factory. Upon
receipt of the relay, no adjustments, other than
those
covered under
"SETTINGS,"
should be
required.
Overvoltage Unit
(V)
1.
Contact Gap- The gap between the left-hand
stationary and moving contacts with the relay in
the de-energized position should be approxi
mately
.020".
2.
For the
15-45
volt unit, the pickup of the over
voltage unit can be checked by increasing the
voltage to the relay to
45
volts. The relay should
pickup within
±
5%
of this value. The
15
volt
pickup can be checked by shorting the resistor
and increasing the voltage to this value. The
relay should pickup within
±
5%
of
15
volts.
3.
For the
108- 132
volt unit, the relay can be
adjusted to pickup anywhere within this range
with a resistor adjustment.
Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient
d-e current through the trip circuit to close the
contacts of the
res.
This value of current should
be between
1
and
1.2
amperes. The indicator
should drop freely.
The contact gap should be approximately
5/64"
between the bridging moving contact and the ad
justable stationary contacts. The bridging moving
contact should
touch both stationary contacts
simultaneously.
ROUTINE MAINTE NANC E
All relays should be inspected periodically and the
operation should be checked at least once every
year or at such other time intervals as may be
dictated by experience to be suitable to the par
ticular application.
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