CIRCUIT
DESCRIPTION
25
STARTING
AND RUNNING
CIRCUITS
Time
Delay Relay
As
soon
as
the main line switch
is
turned on, a cir-
cuit
is
immediately completed
to
the filaments of the
tubes and through the heating element on the TD-A
strap of the time delay relay. The circuit through the
heating element
is
as
follows: from
DC
circuit terminal
14, through the jumper
in place of R6, R8,
TD
heater,
TD-BL point
N/C,
to the TD-A point, to
DC
circuit
terminal 13. Current flowing through the heating
element
causes
the TD-A strap to
flex
and close the
TD-A point.
Closing of the TD-A point completes a circuit
through the time delay relay coil, thus causing· the
relay to attract its armature and transfer
its
points.
Opening of the TD-BL
N/C
point breaks the circuit
to
the heating element, thus allowing the TD-A point
to
return
to
its
N/O
position
as
soon
as
the TD-A strap
cools. Closing of the TD-BL
N/O
point completes a
holding circuit
to
the coil of the time delay relay.
Once it
is
picked, the time delay relay remains energized
until the main line switch
is
turned
off.
Motor Control Relay
After cards have been inserted in the card magazine
and the time
delay relay
has
picked, depression of the
start
key
completes a circuit to pick the motor control
relay
as
follows: from
DC
terminal 14, through relay
panel terminal 8, contact roll cover switch 2 (closed
when the contact roll cover
is
down), terminal 7,
jumper
across
R5, TD-BU, stop
key,
pocket stop con-
tact, motor control relay, start
key,
contact roll cover
switch
1,
to
TD-A, terminal 13.
The start
key
must
be
held depressed until the cards
reach a position to close card lever contact
2.
When
card lever contact 2
closes,
a hold circuit
is
completed
to
the motor control relay
as
follows: from terminal
14, through terminal
8,
contact roll cover switch
2,
terminal 7, jumper
across
R5, TD-BU, stop
key,
pocket
stop contact, motor control relay,
MC-AL,
outer card
lever contact
2,
to the start
key,
through contact roll
cover switch
1,
to
Tn-A,
terminal 13. Once the motor
control relay has been picked and
its
hold circuit
established, it remains energized until the stop
key
is
depressed, the pocket stop device
is
activated, the con-
tact roll
. cover
is
raised, or the machine runs out of
cards and the runout capacitor discharges.
Motor Relay and Drive Motor
As
soon
as
the motor control relay
is
picked by
depression of the start
key,
the
MC-BL
point closes
and a circuit
is
completed
to
pick and hold the motor
relay
as
follows: from terminal
14,
through terminal 8,
contact roll cover switch
2,
motor relay,
MC-BL,
to
terminal 6, card lever contact
2,
start
key,
through
contact roll cover switch
1,
to
TD-A, terminal 13.
Pick
of the motor relay closes
its
points and com-
pletes a circuit to the drive motor
as
follows: from
one
side
of the power outlet, through terminal
1,
the
main line switch, main line
fuse
or fusetron, terminal
12, drive motor, terminal 11, motor relay points, main
line fuse or fusetron, main line switch, terminal
2,
to
the other
side
of the power outlet.
As
long
as
the motor relay remains energized, the
drive motor will continue
to
run. The motor relay
will be de-energized, however, when the stop
key
is
depressed, the pocket stop contact opens, the machine
runs out of cards, or the contact roll cover
is
raised.
The motor relay
is
a heavy duty relay with two large
contact point surfaces which can withstand the arc
occurring when the circuit
to
the drive motor
is
made
or broken.
The later type 82 machines are equipped with a
13
HP
motor, while the earlier machines are equipped with
a
Y2
HP
motor. The
Y2
HP
motor draws a larger
starting current than does the
Y3
HP
motor.
Runout
Capacitor
Upon the pickup of the motor control relay and
subsequent closing of card lever comact
2,
the runout
capacitor
is
charged in the following manner: electrons
flow
from the minus
DC
terminal 14, to terminal 8,
through
MC-AU, terminal 17,
to
one plate of the
capacitor, thus depositing on that plate an
excess
of
electrons. From the
opposite
plate of the capacitor,
electrons
are
repelled through terminal 21, the 10,000
ohm variable resistor, terminal 22, the 1000 ohm
resistor, to MC-AL, through card lever contact 2,
contact roll cover switch
1,
to terminal 13, thus creat-
ing a deficiency of electrons on the latter plate.
Once charged, the capacitor retains this charge, ap-
proximately equal in amount to the potential present
across
terminals
13
and 14, until card lever contact
2 opens. Opening of card lever contact 2 removes the
potential impressed on the runout capacitor, allowing
it
to
discharge through the motor control relay in the
following manner: electrons leave the minus plate of
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