DM860 Digital Stepper Driver for Nema 34 Stepper Motor

The BesFoc DM860H is a fully digital stepper driver developed with advanced DSP control algorithm based on the latest motion control technology. It is easy to use and it can be used to drive 2-phase nema 34 hybrid stepper motors smoothly with less heat and noise. It works with 24-80VAC or 24-110VDC voltage and can provide max 7.2A peak current. The system achieves exceptional smoothness, delivering optimal torque while eliminating mid-range instability. Its automatic motor identification and parameter configuration enables quick setup with different motors. Compared to traditional analog drives, the DM860H operates with lower noise, less heat generation, and smoother movement. These features make the DM860H ideal for high-performance applications.

DM860H Driver Features：

1. Average current control, 2-phase sinusoidal output current drive

2. 8 channels output phase current setting

3. Offline command input terminal

4. High hording torque under high speed

5. High performance, low price

6. Opto-isolated signal I/O

7. Overvoltage, under voltage, overcorrect, phase short circuit protection

8. 15 channels subdivision and automatic idle-current reduction

9. Motor torque is related with speed, but not related with step/revolution

Electrical Specifications:

Output Peak Current: 1.0A - 4.2A (Peak)
Input Voltage: +18VDC - 60VDC
Input Current: ＜4A
Consumption: 80W

Operating Environment and other Specifications:

Gases: Flammable gases and electrically conductive dusts are prohibited.
Cooling: Natural Cooling or Forced cooling.
Environment: Avoid dust, oil fog and corrosive gases
Ambient Temperature: 0℃ － 65℃
Humidity: 40%RH－90%RH
Operating Temperature: -10℃ - 45℃
Storage Temperature: -40℃ － 70℃

Hybrid Stepper Motor Driver Description：

Brand	BesFoc
Model	BFDM542
Driver Type	Digital Stepper Driver
DC / AC	DC
Suitable Motor	Nema 17 23 24 Hybrid Stepper Motor
Input Voltage	18V - 60V
Output Current	1.0A - 4.2A
Subdivide Setting	15 (400 - 25600)
Storage Environment	-40℃ - 70℃

Features：

● Average current control, 2-phase sinusoidal output current drive

● DC +18 ~ +60V power supply

● Optically isolated signal input/output

● Offline command input terminal

● Over-voltage, under-voltage, over-current and phase-to-phase short-circuit protections

● Current 8 steps, settable range 2.0A ~ 4.2A

● Subdivision 15 steps, range 400 ~ 25600

The connection between the driver and the two-phase hybrid stepping motor is four-wire. The motor windings are connected in parallel and in series, and the connection method is good. The high-speed performance is good, but the driver current is large (1.73 times the motor winding current). The drive current is equal to the motor winding current.

Interface Signal Description：

Pins	Functions
PUL	Pulse signal, compatible with 5/12/24V
DIR	Directional signalling, compatible with 5/12/24V
ENA	Enable Signal, Suspendable
A+	A+ Phase of stepper motor
A-	A- Phase of stepper motor
B+	B+ Phase of stepper motor
B-	B- Phase of stepper motor
GND	DC power input: 0V
VDC	DC power input: 18 ~60V
Resetting a drive fault when the offline enable signal is active prohibits any valid pulses, the drive's output power elements are switched off and the motor has no holding torque.

DIP Switch Setting：

In order to drive different torque stepping motors, users can set the output phase current of the driver through the dip switches SW1, SW2, SW3 on the driver panel, the output current corresponding to each switch position, the output current corresponding to different models of the driver is different, see the table below:

SW1	SW2	SW3	PEAK（A)	RMS（A）
ON	ON	ON	1.0	0.71
OFF	ON	ON	1.46	1.04
ON	OFF	ON	1.92	1.36
OFF	OFF	ON	2.37	1.96
ON	ON	OFF	2.84	2.03
OFF	ON	OFF	3.32	2.36
ON	OFF	OFF	3.76	2.69
OFF	OFF	OFF	4.2	3.0
SW4: ‘OFF’ is with half-current function; ‘ON’ is without half-current function. Half-current function means that after 500ms of no stepping pulse, the driver output current is automatically reduced to 70% of the rated output current, which is used to prevent the motor from heating up.

Micro step subdivision setting：

Pulse	SW5	SW6	SW7	SW8
400	OFF	ON	ON	ON
800	ON	OFF	ON	ON
1600	OFF	OFF	ON	ON
3200	ON	ON	OFF	ON
6400	OFF	ON	OFF	ON
12800	ON	OFF	OFF	ON
25600	OFF	OFF	OFF	ON

Pulse	SW5	SW6	SW7	SW8
1000	ON	ON	ON	OFF
2000	OFF	ON	ON	OFF
4000	ON	OFF	ON	OFF
5000	OFF	OFF	ON	OFF
8000	ON	ON	OFF	OFF
10000	OFF	ON	OFF	OFF
20000	ON	OFF	OFF	OFF
25000	OFF	OFF	OFF	OFF

DM542 Stepper Motor Driver Dimension:

dm542 microstep driver

1, Q: The motor does not turn and no holding torque:

A: ① check whether the power line is connected to the wrong voltage is too low, need to increase the voltage or correct the power line

② check whether the motor wiring is correct, if not correct motor wiring. Check if the motor wiring is correct, if not, correct the motor wiring.

③ Whether the enable signal is valid, resulting in the motor does not work.

④ Is the subdividing parameter correct?

⑤ Is the current parameter correct?

2、Q：Motor does not rotate but has holding torque:

A: ① The phase sequence of motor wires is wrong, need to swap any two wires.

② Pulse signal input is wrong, need to check the pulse wiring.

3、Q: The motor torque is too small:

A: ① Phase current setting is too small, need to set the phase current corresponding to the motor.

② acceleration is too fast, reduce the acceleration value

③ motor blocking, need to rule out mechanical problems

④ drive and motor mismatch, need to replace the appropriate drive

4、Q：Motor steering error:

A: ① motor line phase sequence is wrong, need to swap any two wires

② motor line has a broken circuit, check and connect the right

5、Q：The alarm indicator light is on:

A: ① Is the motor wire connected incorrectly

② Whether there is over-voltage and under-voltage conditions

③ Motor or driver is damaged

6、Q：Motor acceleration blocking:

A: ① short acceleration time

② motor torque is too small

③ Low voltage or current

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