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.
To Next Page
Loading...
Need help?
General