Epson 440 Manuale Utente
Chapter2 Operating Principles
Rev. A
2-31
2.2.2.8 CR Motor Drive Circuit
In the CR motor, the same UPD2917(IC14) as the PF motor has used. In the IC, Bi-pola drive PWM
current control type is performed, making it possible to provide stable current to each phase of motor.
Also, it makes possible to change over the reference voltage as drive current settings by making 3
combinations(100%, 66% and 33%), using 4 current setting ports(input). (Refer to 2.1.1.3 for motor and
details about sequence) In the carriage motor, firmware supports the micro-step driving in the Stylus Color
600. The figure below shows carriage motor drive circuit.
current control type is performed, making it possible to provide stable current to each phase of motor.
Also, it makes possible to change over the reference voltage as drive current settings by making 3
combinations(100%, 66% and 33%), using 4 current setting ports(input). (Refer to 2.1.1.3 for motor and
details about sequence) In the carriage motor, firmware supports the micro-step driving in the Stylus Color
600. The figure below shows carriage motor drive circuit.
Unlike using Uni-Pola drive, there is no cable for GND in the motor since Bi-Pola drive is performed in the
CR motor.(Refer to section 2.1.1.2 since carriage motor interior connection diagram has the same
connection as the PF motor’s phase connection. This helps to understand the reason why the direction of
current is controlled freely in each phase by the combinations of high/low control signals.
CR motor.(Refer to section 2.1.1.2 since carriage motor interior connection diagram has the same
connection as the PF motor’s phase connection. This helps to understand the reason why the direction of
current is controlled freely in each phase by the combinations of high/low control signals.
The current control is performed by output port(60
•`
67 / 70
•`
71 pin) of E05B43(IC2), its outer resistance
circuit and driver IC14(UDN2917). First, 10 resistance which are connected to the output port of the gate
array divide each current values of phase A and B in the CR motor.
The firmware possesses 16 different ways of current values individually as current table out of
combinations made by 5 resistance which are connected to the output ports(46
array divide each current values of phase A and B in the CR motor.
The firmware possesses 16 different ways of current values individually as current table out of
combinations made by 5 resistance which are connected to the output ports(46
•`
49 pin) in the gate array.
On the other hand, signals which are output by combination of these resistance’s on/off are input
independently in the 25 and 44 pins. HIC is driven at the different standard voltage for each phase A and B.
independently in the 25 and 44 pins. HIC is driven at the different standard voltage for each phase A and B.
Actual on/off control to send electricity through the motor is performed by the process that SEN1 and
SEN2 terminals (2 and 13 pin) detect the input signal from the gate array which is monitored by the
interior comparator, confirm the current that actually flew the phase as current value again and
perform the feed back to the on/off. (Refer to before page since it is same as the one of PF motor)
SEN2 terminals (2 and 13 pin) detect the input signal from the gate array which is monitored by the
interior comparator, confirm the current that actually flew the phase as current value again and
perform the feed back to the on/off. (Refer to before page since it is same as the one of PF motor)
A
PFA
PF/A
PFB
PF/B
3
21
I10
I11
I20
I20
I21
2
1
23
24
Vref1
Vref2
SENS1
E1
SENS2
E2
CRA0
CRA1
CRB0
CRB1
75
76
72
73
73
77
74
74
CRAPH
CRBPH
CRBPH
43
26
26
PH1
PH2
MTBV0-V4
MTAV0-V4
44
25
25
1
2
3
4
/A
/B
B
4
5
Current Selection
Resistor
E05B43(IC2)
UDN2917(IC14)
Figure 2-29. Carriage Motor Circuit Block Diagram