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特性
- Patented technology
- Low cost, high torque in high speed
- Supply voltage up to +70VDC, peak current up to 4.2A
- 3-state current control technology
- Automatic idle-current reduction
- Suitable for 2-phase and 4-phase stepper motors
- Optically isolated input signals
- pulse frequency up to 200 KHz
- 15 selectable resolutions up to 25600 steps/ rev
- DIP switch current setting with 8 different values
- PUL/DIR & CW/CCW mode optional
- Short-circuit, over-voltage, short-voltage protection
- Small size (118x75.5x33mm)
|
Introduction:
ME742 is an economical high performance microstepping driver based on one of the most advanced technologies in the world today. It is suitable for driving any 2-phase and 4-phase hybrid stepping motors. By using advanced bipolar constant-current chopping technique, it can output more speed and power from the same motor, compared with traditional technologies such as L/R drivers. Its 3-state current control technology allows coil currents to be well controlled, with relatively small current ripple and therefore less motor heating. |
应用s:
Suitable for a wide range of stepping motors of Nema 17 and 23, and usable for various kinds of machines, such as X-Y tables, labeling machines, laser cutters, engraving machines, and pick-place devices. Particularly useful in applications with low vibration, high speed and high precision are desired. |
| Electric 参数 (Tj=25o) |
| Parameters |
ME742 |
| Min. |
Typical |
Max. |
单位 |
| Output current |
1 |
- |
4.2 (3A RMS) |
Amps |
| Supply voltage (DC) |
20 |
48 |
70 |
VDC |
| Logic signal current |
7 |
10 |
16 |
mA |
| Pulse input frequency |
0 |
- |
200 |
Khz |
| Isolation resistance |
500 |
- |
- |
MΩ |
|
| Mechanical 参数 (单位: mm, 1 inch=25.4 mm) |
 |
| Pin Assignment and 描述 |
| Control Signal Connector P1 pins |
| Pin Function |
Details |
| PUL﹢(+5V) |
Pulse signal: in single pulse (pulse/direction) mode, this input represents pulse signal, effective for each rising edge; 4-5V when PUL-HIGH, 0-0.5V when PUL-LOW. In double pulse mode (pulse/pulse) this input represents clockwise (CW) pulse. For reliable response, pulse width should be longer than 2.5μs. Series connect resistance for current-limiting when +12V or +24V used. |
| PUL- (PUL) |
| DIR+ (+5V) |
DIR signal: in single-pulse mode, this signal has low/high voltage levels, representing two directions of motor rotation; in double-pulse mode (set by inside jumpers J1&J2), this signal is counter-clock (CCW) pulse, effective on each rising edge. For reliable motion response, DIR signal should be ahead of PUL signal by 5μs at least. 4-5V when DIR-HIGH, 0-0.5V when DIR-LOW. |
| DIR- (DIR) |
| ENA+ (+5V) |
Enable signal: this signal is used for enabling/disabling the driver. 高度 level for enabling the driver and low level for disabling the driver. Usually left unconnected (enabled). |
| ENA- (ENA) |
Remark:PUL/DIR is the default mode, and under-cover jumpers J1 and J2 can be used to switch to CW/CCW namely double-pulse mode. |
| 功率 connector P2 pins |
| Pin Funtion |
Details |
| Gnd |
DC power ground |
| +V |
DC power supply, +20VDC - +70VDC, Including voltage fluctuation and EMF voltage. |
| Phase A |
电机 coil A (leads A+ and A-) |
| Phase B |
电机 coil B (leads B+ and B-) |
|
| Microstep Resolution Selection |
| Microstep resolution is specified by 5, 6, 7,8 DIP switches as shown in the following table: |
| Microstep |
usteps/rev.( 1.8°/rev) |
SW5 |
SW6 |
SW7 |
SW8 |
| 2 |
400 |
OFF |
ON |
ON |
ON |
| 4 |
800 |
ON |
OFF |
ON |
ON |
| 8 |
1600 |
OFF |
OFF |
ON |
ON |
| 16 |
3200 |
ON |
ON |
OFF |
ON |
| 32 |
6400 |
OFF |
ON |
OFF |
ON |
| 64 |
12800 |
ON |
OFF |
OFF |
ON |
| 128 |
25600 |
OFF |
OFF |
OFF |
ON |
| 5 |
1000 |
ON |
ON |
ON |
OFF |
| 10 |
2000 |
OFF |
ON |
ON |
OFF |
| 20 |
4000 |
ON |
OFF |
ON |
OFF |
| 25 |
5000 |
OFF |
OFF |
ON |
OFF |
| 40 |
8000 |
ON |
ON |
OFF |
OFF |
| 50 |
10000 |
OFF |
ON |
OFF |
OFF |
| 100 |
20000 |
ON |
OFF |
OFF |
OFF |
| 125 |
25000 |
OFF |
OFF |
OFF |
OFF |
|
| 电流 Setting |
| 峰值电流 (A) |
RMS (A) |
SW1 |
SW2 |
SW3 |
| 1.0 |
0.71 |
ON |
ON |
ON |
| 1.46 |
1.04 |
OFF |
ON |
ON |
| 1.91 |
1.36 |
ON |
OFF |
ON |
| 2.37 |
1.69 |
OFF |
OFF |
ON |
| 2.84 |
2.03 |
ON |
ON |
OFF |
| 3.31 |
2.36 |
OFF |
ON |
OFF |
| 3.76 |
2.69 |
ON |
OFF |
OFF |
| 4.20 |
3.00 |
OFF |
OFF |
OFF |
|
| Typical Connections |
 |
| Figure 2: Connections to open-collector signal (common-anode) |
 |
| Figure 3: Connections to PNP signal (common-cathode) |
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