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Operation of Control Parts
2-31 CL-S6621
2-2-4. Drivers
(1) PF motor driver
This is a driving circuit to drive the “SA PF Motor” (stepping motor).
The following illustration shows a simplified circuit.
The “SA PF Motor” is driven by the unipolar constant current chopper method.
The exciting method for the motor is the 1-2 phase method.
The power to the “SA PF Motor” is controlled by U14 (FPGA). When pin P1 (VMTON) is “High”
level, Q27 and Q25 turn ON and +24V is supplied to the “SA PF Motor”.
The exciting method is determined by PFMD1 and PFMD2 signals sent from U14 (FPGA) to
U19 (Motor Driver).
The rotational direction of the “SA PF Motor” is determined by PFDIR signal and PFCLK signal
is a clock signal for turning the “SA PF Motor”.
The digital-to-analog converter (U7) is used to control the PF motor current. Its output is
controlled by the data sent from U1A (CPU).
7
11
9
8
10
VBB
M1
M2
M3
CW/CCW
CLOCK
FLAG
U19
Motor Driver
5
1
3
4
6
J6
OUTA1
OUTA2
OUTA1
OUTA2
OUTB1
OUTB2
OUTB1
OUTB2
1
2
23
22
Q27
DTC114EM
Q25
NP15P06SLG
REF/SLEEP1
C93
R60
PFMOTCU
Low: Turns on Q25 to supply
PFMD1
PFMD2
PFENB
PFCLK
13
2
M
PF Motor
VMT
SLA7073MPRT
1
power to "SA Motor PF".
SA PF Motor
3
4
21
20
16
18
PFDIR
PFFLAG
Q5
DTC114EM
R59
R58
PFOFF
U7
D/A Converter
CSB
DI
12
11
CK
10
SCLK
DACCS
SDATA
From
U1A CPU
BH2227
AO1
AO2
AO3
AO4
C121
VMTON
B1_37
U14
FPGA
B1_39
U14
FPGA
P3
From
U14
FPGA
To/From
U1A CPU
This circuit is not used.
+24V
R112
R114
R116
P1
[SA, Main PCB]