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Features
- High quality, low price
- Low heating for motor & driver
- Supply voltage AC80-220V
- TTL compatible inputs
- Automatic idle-current reduction
- Output current up to 7.8A peak
- Input frequency up to 400 kHz
- Opto-isolated inputs
- 16 selectable microstep resolutions up to 10000 steps/rev
- Suitable for any 2-phase and 4-phase stepping motors
- DIP switch current setting
- CW/CCW mode available (optional)
|
Introduction:
MD2278 is a high performance microstepping driver developed with one of the most advanced technologies in the world today. It鈥檚 suitable for driving any 2-phase and 4-phase hybrid step motors. By using advanced bipolar constant-current chopping technique, it can produce more motor torque under high speed condition than other drivers. The microstep capability allows stepping motors run at higher smoothness, less vibration and lower noise. The 3-state current control feature leads to lower motor heating. |
Applications:
Suitable for automated machines and equipments,such as air-driven inscription machines, labeling machines, cutting machines, laser engraving, plotter, medical instruments, and pick-place devices, etc. |
| Electric Specifications (Tj=25o) |
| Parameters |
MD2278 |
| Min. |
Typical |
Max. |
Unit |
| Output current |
0.45 |
- |
7.8 |
Amps |
| Supply voltage (DC) |
80 |
180 |
250 |
VDC |
| Logic signal current |
7 |
10 |
16 |
mA |
| Pulse input frequency |
0 |
- |
400 |
Khz |
| Isolation resistance |
500 |
- |
- |
MΩ |
|
| Mechanical Specifications (Unit: mm, 1 inch=25.4 mm) |
 |
| Pin Assignment and Description |
| 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 upward-rising edge; in double pulse mode (pulse/pulse) this input represents clockwise(CW)pulse. For reliable response, pulse width should be longer than 1.2us. |
| 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 SW5), this signal is counter-clock (CCW) pulse, effective on each rising edge. For reliable motion response, direction signal should be sent to driver 5us before the first pulse in the reverse motion direction. |
| DIR- (DIR) |
| ENA+ (+5V) |
Enable signal: this signal is used for enabling/disabling the driver. High level for enabling the driver and low level for disabling the driver. Usually left unconnected(enabled). |
| ENA- (ENA) |
| READY+ |
Output alarm signal positive: READY is a photocouper output from open-collector circuit, effectively output when driver operate normally, maximum permitted input voltage 30VDC; maximum output current 20mA, generally can be serial connected to PLC input terminal. |
| READY- |
Output alarm signal negative. |
|
| Power connector P2 pins |
| Pin Funtion |
Details |
| AC |
AC input, varies from 80V to 220V, recommended to use 180V. |
| AC |
| Phase A |
Motor coil A (leads A+ and A-) |
| Phase B |
Motor coil B (leads B+ and B-) |
| PE |
Connect ground terminal |
|
| Microstep Resolution Selection |
| Microstep resolution is specified by 5, 6, 7,8 DIP switches as shown in the following table: |
| usteps/rev.( 1.8°/rev) |
SW1 |
SW2 |
SW3 |
SW4 |
| 400 |
ON |
ON |
ON |
ON |
| 500 |
OFF |
ON |
ON |
ON |
| 600 |
ON |
OFF |
ON |
ON |
| 800 |
OFF |
OFF |
ON |
ON |
| 1000 |
ON |
ON |
OFF |
ON |
| 1200 |
OFF |
ON |
OFF |
ON |
| 1600 |
ON |
OFF |
OFF |
ON |
| 2000 |
OFF |
OFF |
OFF |
ON |
| 2400 |
ON |
ON |
ON |
OFF |
| 3200 |
OFF |
ON |
ON |
OFF |
| 4000 |
ON |
OFF |
ON |
OFF |
| 5000 |
OFF |
OFF |
ON |
OFF |
| 6000 |
ON |
ON |
OFF |
OFF |
| 6400 |
OFF |
ON |
OFF |
OFF |
| 8000 |
ON |
OFF |
OFF |
OFF |
| 10000 |
OFF |
OFF |
OFF |
OFF |
|
| Current Setting |
| Peak Current (A) |
RMS (A) |
SW6 |
SW7 |
SW8 |
SW9 |
| 0.45 |
0.32 |
OFF |
OFF |
OFF |
OFF |
| 0.63 |
0.45 |
OFF |
OFF |
OFF |
ON |
| 1.41 |
1.00 |
OFF |
OFF |
ON |
OFF |
| 1.88 |
1.34 |
OFF |
OFF |
ON |
ON |
| 2.33 |
1.66 |
OFF |
ON |
OFF |
OFF |
| 2.85 |
2.04 |
OFF |
ON |
OFF |
ON |
| 3.23 |
2.31 |
OFF |
ON |
ON |
OFF |
| 3.75 |
2.68 |
OFF |
ON |
ON |
ON |
| 4.26 |
3.04 |
ON |
OFF |
OFF |
OFF |
| 4.65 |
3.32 |
ON |
OFF |
OFF |
ON |
| 5.18 |
3.70 |
ON |
OFF |
ON |
OFF |
| 5.55 |
3.96 |
ON |
OFF |
ON |
ON |
| 6.15 |
4.39 |
ON |
ON |
OFF |
OFF |
| 6.60 |
4.71 |
ON |
ON |
OFF |
ON |
| 7.20 |
5.14 |
ON |
ON |
ON |
OFF |
| 7.80 |
5.57 |
ON |
ON |
ON |
ON |
|
| Typical Connections |
 |
| Figure 2: Typical connections |
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