Drive Circuit - Star Micronics SCP700 Series Programmer's Manual

26

Drive circuit

The recommended drive unit is shown below.
[Drive output 24V, max. 1.0A]
F.G
TR1
M-GND
TR2
M-GND
TR3
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 .
• 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
• Absolute maximum rating for transistors TR1 and TR2 (Ta = 25 C) are:
Collector current Ic = 2A
7824
+24V
+5V
R1
R2
Printer side
1
2
D1
3
4
D2
5
6
User side
With shield
Peripheral
L1
unit 1
R3
4.7k
L2
1/4W
Peripheral
unit 2
Compulsion
switch
Frame
ground
= 40A
FSM