GENERAL
BTCU3 contains control and
positioning electronics for the alate carrier,
A
-
the filter stepping motorand the pinhole plate.
349-04-S Schematic diagram
Component layout
NG
AND
AD
Inseructions are given in chapter
"TESTING
AND
ADJUSTING".
Motor controller
NI
(L297) generates phase
drive sign& for steppermotor. Dual fullbridge
dfiverN2converts the logic level phase signals
to high voltage and high current for stepper
motor windings. Dual matrix diode circuit
V4
(UC 3610) protects outputs of N2.
Motor dbiverN1 drives the motors in unipolar
mode. Table 3-12 illustrates control signals
from a processor board through connector
XI.
kepper Motor Controller
I
hase drive signals for 4 phase stepper motor.
ulse width modulating chopper circuits
permit switching mode control of
the
current
in
the windings. The resistors
Rll,
R12,
R20-23 provide current feedback signals to
the controller. RC circuit R10,
C4
determines
the chopper rate.
1
PLATE MOTOR
WF
Half/full step dtiving method,
=GI3
=
half step,
LOW
=
full step
3 PLATE MOTOR
CW/=W
late carrier driving direction,
HIGH
=
canier out, LOW
=:
canier in
4
PLATE ENABLE
Enables plate carrier stepping motor operation.
5 PLATE CURRENT
Controls motor current,
HIGH
=
high current, LOW
-
low current
9
Clock frequency for motor driver.
Table
3-
12
Control
signals
to
pcb
MOTCU3
Document Release Section Page
3511352-100-X 2.0
3
18
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