OR
DRIVING
(Sprague's
OCN
5804
drives the filter motor in half-step mode only
in one direction. Table
3-
13
illus~tescontrol
signals from a processor board through
connector
Or
1.
Diodes
V'7
-
V10,
zener diode
V6
(8.2
V)
and
capacitor
614 protect driving circuit against
inductive rransients.
R19
(PTC) protects themotor anddriver from
overheatingduringamalfnnction.
Ifthesupply
current exceeds
470
mA,
PTC's
resistance
increases and the supply current is reduced.
a.
0
Stepper motor driver
N3
(PBL
3717)
drives
the solenoid of the pinhole plate through
connector
X6.
The circuit consists of an
LS'PIZcompatible logic input, current sensor,
switch mode current regulator and an output
stage with built-in protection diodes.
R8
is the current feedback resistor, and the
current sense signal
is
connected through
resistor
R'7
to comparator input.
R5
andC4determineslhe switching kequency.
Input
0
(Pin
9)
is kept steady high and input
1
(Pin
9)
is controlled
by
the processor through
latch circuit Dl and connector Xl pin
6
(Signal name SOLENOID).
2
FILTER
ENABLE
9
MULTISKAN
RC
and
M
with a positioning strip attached to the carrier.
Positioning strip has
12
sages, one for each
coh ofthe Mimpllate.
out or acolumn is positioned for measurement.
PLATE DET-signals high state opens the
transistor
V3
and IR-reader's LED is
illuminated. If the lightpathis free,
tsansisror opens and PLATEPOS-signal goes
low, which is the active state.
Filter motor positioningoperates same way as
plate carrier positioning. Two IR-readers are
connected to connector
X4.
High state of the
signal FlLTEKDETactivates the LEDs of the
IR-readers through transistor
V%.
The
transistors of the iR-readers are connected
throughlatch circuitD1 toconnectorX1. Low
state of signal ELTERPOS (pin
11)
indicates
that one of the filters is selected. Law state of
signal FlLTERMOMEPOS (pin
10)
indicates
the home position of the filterwheel, which
also means filter no
1
is selected.
Pinhole plate positioning operates as other
positionings. IR-reader is connected to
connector
X5.
FILTER DET-signal activates the LED of the
IR-reader, and the output
is
connected to
PLATE PO§-signal.
LOW
=
active, enables filter motor operation.
Clock
frequency for motor driver.
Table
3-13
Control
signals
to
pcb
MOTCU3
Document Release ection age
35
1/352-100-X 2.0
4
19
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