ME742 Economical Microstepping Driver Manual V1.0
Tel: +086 0755-26434369 1 Web Site:
1. Introduction, Features and Applications
Introduction
The ME742 is an economical microstepping driver based on patented technology of Leadshine. It
is suitable for driving 2-phase and 4-phase hybrid stepping motors. By using the advanced bipolar
constant-current chopping technique, it can output more speed and torque from the same motor,
compared with traditional drivers, such as L/R drivers. Its 3-state current control technology
allows coil currents to be well controlled and with relatively small current ripple, therefore less
motor heating is achieved.
Features
l
Low cost and good high-speed torque
l
Supply voltage up to +70VDC
l
Output current up to 4.2A
l
Optically isolated input signals
l
Pulse frequency up to 200 KHz
l
Automatic idle-current reduction
l
3-state current control technology
l
15 selectable resolutions
l
Suitable for 2-phase and 4-phase motors
l
DIP switch current setting with 8 different
values
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CW/CCW mode available (optional)
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Over-voltage and short-circuit protection
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Small size (118*75.5*33mm)
Applications
Suitable for a wide range of stepping motors from NEMA size 16 to 34. It can be used in various
kinds of machines, such as X-Y tables, labeling machines, laser cutters, engraving machines,
pick-place devices, and so on. Particularly adapt to the applications desired with low vibration, high
speed and high precision.
2. Specifications and Operating Environment
Electrical Specifications
(T
j
=
25
℃
)
ME742
Parameters
Min
Typical
Max
Unit
Output current
1.0
-
4.2 (3.0A RMS)
A
Supply voltage
20
48
70
VDC
Logic signal current
7
10
16
mA
Pulse input frequency
0
-
200
KHz
Isolation resistance
500
M
Ω
ME742 Economical Microstepping Driver Manual V1.0
Tel: +086 0755-26434369 2 Web Site:
Operating Environment and other Specifications
Cooling
Natural Cooling or Forced cooling
Environment
Avoid dust, oil fog and corrosive gases
Ambient Temperature
0
℃
－
50
℃
Humidity
40%RH
－
90%RH
Operating Temperature
70 Max
℃
Operating Environment
Vibration
5.9m/s
2
Max
Storage Temperature
-20
℃
－
65
℃
Weight
Approx. 280 gram (9.9 oz)
Mechanical Specifications
(unit:mm, 1 inch = 25.4 mm)
Figure 1: Mechanical specifications
*Recommended to use side mounting for better heat dissipation
Elimination of Heat
l
Driver
’
s reliable working temperature should be <65 , and motor working temperature should
℃
be <80 ;
℃
l
Recommend use automatic idle-current reduction mode, namely current automatically be
reduced to 60% when motor stops, so as to reduce driver heating and motor heating;
l
Recommend use side mounting to maximize heat sink area.
