Specifications
REV.-B
2.3.4 MOTOR, CR Drive Circuit
Figure 2-22 shows the MOTOR, CR drive circuit. An open-loop, constant-current drive arrangement is
used for running the MOTOR, CR. The motor is driven by 2-2 phase excitation and 1-2 phase excitation.
2-2 phase excitation corresponds to two 1-2 phase excitation steps. Thus, for each single step phase
change of a
2-2 phase excitation motor, the carriage moves 1/1 20 inch. For each single step phase
change of a 1-2 phase excitation motor, the carriage moves 1/240 inch.
The MOTOR, CR drive circuit of the
STK-6022B
detects the amount of current flowing in the MOTOR,
CR coil and regulates this current. The current flowing through the coil varies, depending on the speed
of the MOTOR, CR. The amount of current is set by the CPU via the
E05A50
1/0
port. Signals are sent
to
SELR
1 to SELR4 on the
STK-6022B.
The
STK-6022B
sets the coil current to correspond to the
MOTOR, CR speed.
Ports
P60
to
P63
on the CPU are used exclusively as control ports
CPU (lC)
P60
P61
P62
-
P63
STK-6022B (2A)
CRAIN
CRA
CRBIN
CRB
CRCIN
CRC
m
CRD
Po
SELR1
Data
Bus
P1
SELR2
P2
SELR3
Gp
P5
SELR4
E05A50(4D)
for the stepping motor.
-
Coil Current
MOTOR, CR
1
i
Coil Current
GND
Figure 2-22. MOTOR, CR Drive Circuit
Table 2.6. MOTOR, CR Drive Modes
I
Drive Mode Excitation Tvoe
-
Drive Frequency Type
Standard Print Character
3.214 X speed
3 X speed
2 X speed
1.5
X speed
4/3 X speed
1 X speed
2/3 X speed
1/2 X
sDeed
2-2 phase
2-2 phase
2-2 phase
1-2 phase
1-2 phase
1-2 phase
1-2 phase
1-2 phase
2700 PPS
2520 PPS
1680
pps
2520 pf)S
2240 PPS
1680
pps
1120
pps
840 PPS
High Speed Draft
Draft
LQ
I
I
I
2-17