CIRCUIT
DESCRIPTION
23
an armature end
view
of a standard duo relay with the
different contact points properly identified.
Glossary
of
Terms
and
Abbreviations
Listed below are some of the terms and abbreviations
used
in connection with the Type 82 wiring diagram.
NjC
NjO
OjP
VI
VI-4
AC
DC
R2
TD
MC
MC-BL
TD-BU
Time Delay Relay
Normally Closed Point
Normally Open Point
Operating Point
Tube I .
Tube
1,
Pin 4
Alternating Current
Direct Current
Resistor 2
Time Delay
Motor Control
Motor Control Relay
BL
Point
Time Delay Relay
BU
Point
A time delay relay
is
employed in the machine
to
render the
staJlt
key
inoperative for 50 to 60
seconds
after turning on the main line switch. This delay
is
necessary to allow the electron tube filaments to reach
operating temperature before sorting begins.
A contact
strap, composed of two dissimilar metals,
is
heated by
passing current through a coil of wire wrapped around
the strap. Heating of this strap
causes
it to flex in a
definite direction and, after having
flexed
a great
enough distance, a contact point riveted
1:0 the strap
makes contact with another adjustable contact point
and completes a circuit to pick
up the time delay relay.
The duration of time required
to
cause the time delay
relay to pick may
be
altered
by
increasing or decreasing
the
air gap between the A points
by
means of the
ad-
justing screw on the outer contact strap.
Relay
Gate
and
Electronic Chassis
The relay gate
is
located behind the cover on the
right
end of the machine and may
be
pivoted outward
for ease of servicing (Figure
22).
A latch mechanism
keeps the gate locked in
its
closed position at all other
times.
The electronic
chassis
is
mechanically fastened
to
the relay gate
by
means of 4 screws.
It
is
electrically
connected
to
the rest of me machine circuits through
an octal plug and tube socket.
NOTE:
The following change should be made
to
the octal plug of machines wired prior to wiring dia-
gram 301701-C,
so
that
chassis
301639, which
is
wired
to
301701-C, may
be
used:
pins 6 and 8 must be
jumpered in the octal plug to provide a circuit from
the cathodes
of
the 25L6 sort magnet tubes to the
negative
side
of the
DC
circuit. These cathodes are
connected
separately to pin 8 on chassis 301639, which
is
wired to 301701-C. This change should not be made
on machines with special features without first checking
the special feature wiring diagram
as
pin 8
is
often
used
to separate these special circuits from the standard
wiring on pin 6.
Figure
23
shows
a bottom view of the electronic
chassis.
Tube Filaments
Upon closing of the main line switch, a
cirCUit
15
completed to the filaments of the vacuum tubes
as
follows: one side of the power outlet, through relay
panel terminal
I,
the main line switch, main line
fuse
or fnsetton, 2 ampere
fuse,
octal plug terminal 7, the
filaments of vacuum tubes
5,
6,
4, 3 and 2 in series.
octal plug terminal
2,
relay panel terminal 9, to the
rectifier stack, through the 2 ampere
fuse,
main line
fuse
or fusetron, main line switch, relay panel terminal
2, to the other side of the power outlet.
DC
Machine Circuit
The
DC
supply for operation of machine functional
circuits
is
as
follows: from one
side
of the power outlet,
through relay panel terminal
1,
the main line switch,
main line
fuse
or fusetron, 2 ampere
fuse,
one leg
of
the selenium rectifier, the minus terminal of the recti-
fier,
to
DC
circuit terminal 14 constituting the minus
side of the line. A similar circuit can
be
seen through
the plus
side
of the rectifier to DC circuit terminal 13
constituting the plus
side
of the line.
A filter capacitor
is
connected
across
the minus and
plus terminals of the selenium rectifier to steady its
output.
A bleeder resistor
is
connected
across
the
terminals of the capacitor to bleed out the charge on
the condenser after the main line switch
is
turned
off.
Since relay panel terminal 14 constitutes the minus
side of the
DC
circuit supply and relay panel terminal
13
constitutes the plus side of the
DC
circuit supply, all
subsequent functional circuits described herein
will
begin at terminal 14 and end at terminal 13.
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