Star Micronics SCP700 - Manual (Page 174)

170
APPENDIX
Drive circuit
The recommended drive unit is shown below.
[Drive output 24V, max. 1.0A]
Notes
• Peripheral Units 1 and 2 cannot be driven simultaneously.
• For continuous driving, do not use drive duty above 20%.
• Compulsion switch status is available as status data.
• Minimum resistance for coils L1 and L2 is 24
Ω
.
• Absolute maximum ratings for diodes D1 and D2 (Ta = 25
°
C) are:
Average Rectified Current Io = 1A
Maximum forward surge current (60Hz, 1-cycle sine wave) I
FSM
= 40A
• Absolute maximum rating for transistors TR1 and TR2 (Ta = 25
°
C) are:
Collector current Ic = 2A
7824
F.G
TR1
M-GND
TR2
M-GND
TR3
+5V
+24V
R1
R2
6
5
4
3
2
1
L1
L2
R3
4.7k
Ω
1/4W
Frame
ground
Printer side User side
D1
D2
Peripheral
unit 1
With shield
Peripheral
unit 2
Compulsion
switch