84
SPECIAL
DEVICES
counter tube filaments only during counter operation.
R51BUN/C
opens to put the start circuit under the
control of
52BU and the counter reset switch. The N/O
point closes
so
that R 114 (card lever)
is
picked only
during counter operation.
R51BL
is
in parallel with 51AL.
R52
(thermal delay) provides a time delay to assure
that the machine cannot be started until the counter
tube filaments reach operating temperature.
52A
is
the thermal delay point.
52BU prevents starting the machine until tube
fila-
ments are at operating temperature.
52BL provides a circuit to the thermal delay heater
until 52A closes to pick the relay.
52BLN/O then
closes to provide a hold for R52.
R53 (run-out delay)
is
picked and held
by
MC
BU
when the counter switch
is
on.
A resistor-capacitor net-
work in parallel with R53 keeps it energized for a
short time after the motor control relay drops.
R53AU
provides a discharge path for the capacitor
(in parallel with
R53)
to keep R53 energized for a
short time after the motor control relay drops.
R53AL
points are not
used.
R53BU
provides a circuit to the motor relay after
the counter control circuits are conditioned.
R53BL
assures that R54 cannot
be
energized while
the machine
is
running.
R54
(interlock)
is
picked and held at any time the
machine
is
in a static condition with the counter
switch on.
R54AN/O
provides a hold for R54 through C13.
The N/C point opens to prevent a circuit to the counter
magnets when the machine
is
in a static condition.
Cam Contacts
Electrical cams and index are located below the card
feed hopper.
C1
(351°
-276°)
(installed if machine
is
not equipped with
GS
device or
MCS)
provides a
cir-
cuit to the common brush of the contact roll that spans
9 through 12 time during counting.
C1
also completes
the circuit to the main anode of the
OA4G when
counting
is
taking place.
C6
(340
0
-265°)
(installed if machine
is
not
equipped with
MCS
device)
is
used
with
C1
as
a make-
break combination to complete a circuit to the start-
ing anode of the
OA4G during simultaneous sorting
and counting.
C7
(350°
-300°)
controls the plate
circUits
of
2D21 counter tubes 9-2 to extinguish the tube after
memory has been transferred to digit memory relays.
C8
(180°
-130°)
controls the pick and hold of
the digit memory relays. The hold lasts until C13 can
energize the proper counter magnet.
ClO
(190°
-284°)
controls the tube transfer relay
(R115)
to permit memory to be transferred from tubes
to digit memory relays for digits 2 through 9.
C13
(300°
-120°)
provides the impulse to the
counter magnets through the network of digit memory
relay points.
Switches
Counter Switch. The counter switch conditions the
machine for counting operation. The counter switch
right in the
ON
position provides
+48
volts to R51,
R52, R54, C13, ClO, and R115. The counter switch
left in the
ON
position provides
+48
volts to
RI13,
Rl18,
and R53.
Count-Only
Switch. The count-only switch in the
OFF
position completes a circuit to the starting anode
of the
OA4G to provide sorting while counting. The
ON
position interrupts the circuit to the OA4G, starting
anode to cripple sorting but permit counting.
Rectifier
The rectifier between card lever 2 and MC-ALN/O
is
to prevent the pick of R114 (Card Lever) until card
lever 2
is
closed. Without the diode, when the start
key picks the MC relay, there
is
a circuit through
MC-
ALN/O to pick R114.
Resistor
The 2500-ohm resistor in the circuit to grid 2 of
the counter tubes provides a voltage drop from
+150
volts to
+60
volts. Voltages in
excess
of
+60
volts
impressed on either grid of a 2D21 can cause the tube
to conduct even though the remaining grid
is
not con-
ditioned.
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