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CIRCUIT DESCRIPTION
ALL CIRCUITS described in the electrical principles of
the Type 75 Card Counting Sorter will refer to wiring
diagram
153129~S.
A reproduction of this wiring dia-
gram is shown in Figure 32. Since the starting and run-
ning circuits in the Type 75 machine are very similar to
those employed in the Type 80 machine, they will not
be discussed in detail in this section of the manual.
Only the counting and sorting circuits will be covered.
The rectifier output voltage should be between
120 volts and 135 volts at the specified input voltage
(115, 200 or 230) with the machine stopped, and the
sort magnet and a count magnet energized.
NOTE: The machine frame should be grounded.
However, it may be ungrounded at the customer's op-
tion, except for 230 volt
DC
machines which must be
grounded at all times. No point which can be touched
by operating personnel can be hot when the switch is
on and the frame is grounded.
Relay Cabinets and Power Supply Rectifier
There are two relay cabinets in the Type 75 Sorter;
a sorter relay cabinet and a counter relay cabinet. The
sorter relay cabinet is located on the right end of the
machine and is shown in Figure 33 with the cover re-
moved. It contains the necessary relays, resistors and
capacitors which are
use~
in the sorting, starting, and
running circuits. This cabinet also contains all the
machine fuses. The motor relays are heavy duty relays,
the brush control relay is a high speed slate base re-
lay, and the card control relay is a duo relay. (On
older machines, the card control relay is a high speed
slate base relay.)
The counter relay cabinet is accessible from the rear
of the machine and is shown in Figure 34 with the
door . open. It contains all relays, resistors, capacitors
and the selenium rectifier used in the counting circuits.
The counter relays and the transfer setup relay are
high speed slate base relays. The card lever hold re-
lay, card lever 2 relay, and the count control relay
are duo relays.
Resistors 3, and 8 through 22 inclusive are built into
. their respective capacitors with which they are used.
,
Type 75 machines are equipped with a larger power
supply. rectifier than are the Type 80 machines.
45
Figure 33. Type 75 Sorting Relay Cabinet
COUNTING CIRCUITS
Card Lever Hold Relay
Once card lever contact 1 has closed, the card lever
hold relay is picked each card cycle when commutator
1 makes. The circuit is as follows: from the plus DC
terminal, through contact roll cover switch
1,
to R-2,
through card lever contact 1, commutator 1, card lever
hold relay, R-35, contact roll cover switch 2, reset
interlock contact, to the minus DC terminal.
Following the pickup of the card lever hold relay,
it is held energized through its own AL point and com-
mutator 2. This hold circuit lasts until after 12 time,
following which the card lever hold relay
is
dropped
and then picked again through commutator 1 in the
next card cycle. The AL point of the card lever hold
relay prevents any impulses through commutator 2 to
the digit counters until after the first card in the
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