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This item includes:

1 pcs Stepper motor driver DM542, PEAK 4.2A, 128 micsteps

Driver DM542

Introduction:

DM542 is a high-performance digital stepper driver for 2-phase hybrid stepper motors. Adopts advanced DSP control for smooth movement, low vibration and low heat. Great for CNC, laser machines and automation equipment.

Key Features

- 32-bit DSP digital control, smooth sine wave drive

- Wide voltage: DC 20V–50V

- Adjustable output current: 1.0A–4.2A

- 16-level microstep, max 25600 steps/rev

- 200KHz pulse response, stable high-speed running

- Multiple protection: over-current, over-voltage, short-circuit

- Optical isolation input, strong anti-interference

- Compact structure, simple wiring & easy setup

Pins assignments and description:

1) Connector Pins Configurations

Pin Function	Details
PUL +,PUL-	Pulse signal, PUL+ is the positive end of pulses input pin PUL- is the negative end of pulse input pin
DIR+,DIR-	DIR signal: DIR+ is the positive end of direction input pin DIR- is the negative end of direction input pin
ENBL+	Enable signal: ENBL+ is the positive end of direction input pin. This signal is used for enabling/disabling the driver. High level for enabling the driver and low level for disabling the driver.
ENBL-	ENBL- is the negative end of direction input pin. Usually left unconnected (enabled)

2) Pins wiring diagram:

PC’s control signals can be active in high and low electrical level. When the high electrical level

is active, all control negative signals will be connected together to GND. When low electrical

level is active, all control positive signals will be connected together to public port. Now give

two examples( Open collector &PNP), please check them:

Fig 1. Input port circuit (Yang connection)

PC open connector output

Fig. 2 Input port circuit ( Yin connection)

PC PNP output

Note: When VCC=5V, R=0

When VCC=12V, R=1K, ＞1/8W

When VCC=24V, R=2K,＞1/8W

R must connect in the control signal part.

3. Function choice ( Using DIP pins to achieve this function)

1) Micro step resolution is set by SW 5,6,7,8 of the DIP switch as shown in the following table:

SW5

OFF

SW6

OFF

SW7

OFF

SW8

OFF

PULSE/REV

400

800

1600

3200

6400

12800

25600

1000

2000

4000

5000

8000

10000

20000

25000

2) Standstill current setting

SW4 is used for this purpose. OFF meaning that the standstill current is set to be half of the selected dynamic current and ON meaning that standstill is set to be the same as the selected dynamic current.

3) Output current setting:

The first three bits (SW 1, 2, 3) of the DIP switch are used to set the dynamic current. Select a setting

Closest to your motor’s required current

Output current (A)
SW1	SW2	SW3	PEAK	RMS
ON	ON	ON	1.00	0.71
OFF	ON	ON	1.46	1.04
ON	OFF	ON	1.92	1.36
OFF	OFF	ON	2.37	1.69
ON	ON	OFF	2.84	2.03
OFF	ON	OFF	3.32	2.36
ON	OFF	OFF	3.76	2.69
OFF	OFF	OFF	4.20	3.00

4) Semi-flow function:

Semi-flow function is that there is not step pulse after 500 ms, the driver output current automatically reduced to 70% of rated output current, which is used to prevent motor heat.

4. Power connections

(1)+V、GND：Power Supply.

+V: Power supply, 16~50 VDC, Including voltage fluctuation and EMF voltage. The max current is 5A.

(2) A+ A- B+ B-：Connecting 2 phase stepper motors.

The driver & 2-phase hybrid stepping motor use four-wire connection, the motor can be connected in parallel & series bipolar. As for bipolar connection, it is higher performance with high-speed, but the current of driver is larger (it is 1.73 times more than the motor’s winding current).
Connecting in series, the driver’s current is equal to the motor winding one.

5. Fixing

There should be 20mm of space, it can’t be placed next to other heating devices, to avoid dust, oil mist, corrosive gas, humidity and strong vibration places.

(Unit=mm)

6. Troubleshooting

1, the status on light’s indication

RUN: green, normal work light.
ERR: red, failure light, the motor with phase short-circuit, overvoltage and under-voltage protection.

2 Troubles

Alarm indicator	Causes	Measures
LED off turn	Wrong connection for power	Check wiring of power
LED off turn	Low-voltages for power	Enlarge voltage of power
Motor doesn’t run, without holding torque	Wrong connection of stepper motor	Correct its wiring
Motor doesn’t run, without holding torque	RESET signal is effective when offline	Make RESET ineffective
Motor doesn’t run, butmaintains holding torque	Without input pulse signal	Adjust PMW & signal level
Motor runs wrong direction	Wrong wires’ connection	Change connection for any of 2 wires
Motor runs wrong direction	Wrong input direction signal	Change direction setting
Motor’s holding torque is too small	Too small relative to current setting	Correct rated current setting
	Acceleration is too fast	Reduce the acceleration
	Motor stalls	Rule out mechanical failure
	Driver does not match with the motor	Change a suitable driver

Additional instructions：

1.About VAT invoice:Usually I will make invoice every Day,then I will send invoice to your ebay e-mail.Or we send the invoice is issued with the goods.

If you don’t receive invoice,you contact me by ebay message.

2.Delivery time:All products are available and can be shipped out right after payment.

I only make ship on work day（Except Saturday、Sunday and Holiday）.- Shipping via DHL or UPS.After delivery,Please wait patiently.If you not receive goods for a long time,you search the tracking on DHL or UPS website.If the tracking has problem,you make a call to your local DHL or UPS,then contact me .

3.Service:Please check the technical specifications and compatibility with your driver and device before purchase.

The pictures show the actual item. Minor colour differences may occur due to screen settings.

The motor may overheat under overload. Please operate the motor within the specified parameters.

Any technical questions? Feel free to send us a message.

Application:This stepper motor is widely used in the following devices and projects:

• 3D printers

• CNC milling machines and engraving machines

• Robotics and robotic arms

• Small conveyor systems

• Automatic sliding units

• DIY model building

• Laboratory equipment and small automation systems