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CIRCUIT
DESCRIPTION
ALL CIRCUITS described in the electrical principles of
the Type 80 Card Sorting machine will refer to wiring
diagram 16I847-N. A reproduction of this wiring dia-
gram is shown in Figure 27. Those circuits explained
will be the circuits incorporated in a 115 volt
AC,
single phase machine because this is the type most
prominently in use in the field. Circuits for machines
using a power supply other than 115 volt
AC,
single
phase will be found to be very similar in layout except
for the addition or subtraction of various resistors, filter
capacitors, or a transformer in the machine power
supply.
Direct current is required for the operation of all
machine circuits with the exception of the motor cir-
cuits. Where the source voltage is
DC,
there is no prob-
lem except for the increase of resistor values where the
DC
rating
is
greater than 115 volts. Where the source
voltage
is
AC,
however, selenium rectifiers are employ-
ed to convert the
AC
to
DC.
NOTE: The machine frame should be grounded. It
may be ungrounded however, at the customer's option,
except for 230 volt
DC
machines which must have the
frame grounded at all times. No point which can be
touched by operating personnel can be hot when the
switch is on and the frame grounded.
Relay Cabinet
The relay cabinet, located on the right end of the
machine, serves as a container for all fuses, relays, re-
sistors, and capacitors. Figure 28 shows the relay cabinet
with the cover removed.
DC Machine Circuit (Figure 27)
The
DC
supply for operation of machine functional
circuits is as follows: from one side of the power out-
let, through F3, the main line switch, F2, the minus
side of the rectifier, to the minus
DC
circuit terminal.
A similar circuit can be seen through the plus side of
the rectifier to the plus
DC
circuit terminal.
A filter capacitor is connected across the plus and
minus terminals of the rectifier to reduce ripple and
steady its output. A bleeder resistor
is
connected across
the terminals of the capacitor to bleed off its charge
after the main line switch has been turned off.
35
Since the circuit to the plus and minus
DC
circuit
terminals has been given, all subsequent circuits
described herein will begin at the plus
DC
terminal
and will terminate at the minus
DC
terminal.
STARTING AND RUNNING CIRCUITS
Motor Relay and Card Control Relay
After cards have been inserted in the card magazine
and the contact roll cover has been lowered, depres-
sion of the start key completes a circuit to pick the
card control relay and the motor relay as follews:
from the plus
DC
circuit terminal, through contact roll
cover switch 1, the start key, card control relay, pocket
stop switch, stOP key, motor relay, jumper in place of
R-2, 2 ampere fuse, contact roll cover switch 2, to the
minus
DC
circuit terminal.
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 card control relay and the motor relay through
the card lever 2 contact points and the CCR-A point.
Once the card control relay and the motor relay are
picked up and their hold circuits established, they re-
main energized until the stop key is depressed, the
pocket stop device is actuated, the contact roll cover
is
raised, or the machine runs out of cards and the run-
out capacitor discharges.
Drive Motor
As soon as the motor relay is picked, a circuit is com-
pleted to the drive motor as follows: from one side of
the power outlet, through F3, the main line switch,
drive motor, motor relay contact points, main line
switch, F4, 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 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 80 machines are equipped with a
1/3
HP
motor, while the earlier machines are equipped
with a 1/4
HP
motor.
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