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TYPE KA CARRIER AUXILIARY RELAY
the right hand pole face (a
head is equal to
.020"
travel ot: the moving contacts).
Using
an indicating light in each contact circuit,
adjust
the upper and lower stationary contacts to
touch the moving contact at the same time.
feeler gauge removed the contact gap is
moving contacts close simultaneously.
Connect a jumper between the middle and left
hand contact connection of the CSG or CSP switch.
The CSG switch is located on the left-hand pedestal
and CSP is located on the right hand pedestal of the
relay (front view).
Apply rated voltage across the
RRT coil and the RRT coil resistor observing polar
ity
shown in the interval schematic
as
armature should mo.ve to the left.
To the holding coil, RRH, apply
amperes d.c. current observing correct polarity.
armature should now move to the right.
both coils and see that the armature stays up against
the right hand side.
Run both shunt screws all the way in, and then
back out the left hand shunt screw approximately
turns.
Back out the right hand shtmt screw approxi
9
mately
turns.
Re-energize the operating coil with rated voltage
and the holding coil with
the right hand contact shunt screw until the armature
If the armature moves to the left,
moves to the left.
at a value of holding coil current greater than
amperes, the right hand shun t screw should be turned
out to lower this value to the correct
point.
Increase the holding coil current to
and adjust the left hand shunt screw until the arma
ture resets, or moves to the right.
resets at a value of current less than
the left hand shun t screw should be turned out.
will increase the reset .value of the armature and pro
vide for the correct
milliampere reset value.
6
Minor adjustments of both shunt screws must be
made several times until the desired operating points
are obtained, since the adjustments of one shunt screw
affect the adjustment on the other shunt screw.
Polar Alarm Unit
The contacts should close with
±
5%
applied to the alarm coil.
travel of the rivet
.010"
With the
.020"
and the
�
iagram.
The
10
to
20
milli
The
De-energize
4
milliamperes d.c.
Adjust
4
milli
4
milliampere
milliamperes
6
If the armature
milliamperes,
6
This
milliamperes d-e
8
Adjust the contact
screws
to
obtain an
the arma ture motion b etween the left and right hand
contacts is in the central part of the air gap between
the pole faces.
Approximate adjustments of the two magnetic shunt
screws are as follows:
Turn both shunt screws all the wa;y in. Then back
out both
shunt screws approximately seven turns.
milliamperes d.c. to the coil observing cor
Apply
8
rect polarity, and then screw in the left hand shunt
screw until the armature moves to the right at a .value
of current less than
hand shunt out until the armature moves to the right
at
8
milliamperes. Check
ducing the d.c. current.
the left between the limits of
it fails to do so, adjust the right hand shunt screw
until it does. It will then be necessarY to recheck the
pickup and dropout points again and make any minor
adjustments to the shunt screws that may be necessary
until correct calibration is obtained.
In general, screwing in the left hand shunt screw
6
reduces the pickup current of the relay. Screwing in
the right hand shunt screw increases the dropout cur
rent. This will in turn cause a change in the pickup
current,
making necessary several slight readjust
ments of both shunt screws to obtain the desired cali
bration. The armature as finally
pickup and dropout with a snappy action.
Operation lndi cator
The operation indicator should pick up and drop
the indicator target when the current is between
1.2
amperes d-e.
remove the molded cover and bend the springs out or
away from the cover. To decrease the pick-up current,
bend the springs in toward the cover.
Ma ke sure that the target drops freely when the
unit operates.
RENEWAL
Repair work can
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 nameplate data.
.050"
contact
gap
Tighten the contact locking nuts.
8
milliamperes,
screw the left
the dropout point by re
The armature should move to
and
milliamperes. If
4
6
cali�rated
To increase the pick-up current,
PARTS
be
done most satisfactorily at
such that
should
and
1
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