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What's in Box?

4 pcs Nema 23 stepper motor with 2.8NM 4.2A,4WIRES
4 pcs stepper motor driver DM542A, peak 4.2A, 128 micsteps, replacing M542
2 pcs Power supply 350Watts (36VDC/9.7A)
1 pc Breakout board & 1 pc Parallel cable

Detailed informations:

1. Nema 23 stepper motor:

Model	Step angel ( ° )	Motor Length L(mm)	Rate Voltage (V)	Rate Current (A)	Phase Resistance ( Ω )	Phase Inductance (mH)	Holding Torque (Nm)	Lead Wire (NO.)	Rotor Inertia (kg. c?)	Motor Weight (kg)
23HS9442	1.8	112	3.78	4.2	0.9	3.8	2.8	4	0.89	1.7

2.Stepper motor driver:

1. Stepper motor driver--DM542A

[link removed by eBay]

DM542A is a type of two-phase hybrid stepping motor driver, The drive voltage of which is from 18VDC to 50VDC. It is designed for use with 2-phase hybrid stepper motor of all kinds with 42mm to 86mm outside diameter and less than 4.0A phase current. This circuit that it adopts is smiliar to the circuit of servo control which enables the motor run smoothly almost without noise and vibration. Hording torque when DM542A run under high speed is also significantly higher than the other two-phase driver, what’s more, the positioning accuracy is also higher. It is widely used in middle and big size numerical control devices such as curving machine, CNC machine, and computer embroider machine, packing machines and so on.

Features:

High performance, low price

Average current control, 2-phase sinusoidal output current drive

Supply voltage from 18VDC to 50VDC

Opto-isolated signal I/O

Overvoltage, under voltage, overcorrect, phase short circuit protection

15 channels subdivision and automatic idle-current reduction

8 channels output phase current setting

Offline command input terminal

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

High start speed

High hording torque under high speed
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
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
SW6
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
SW7
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
SW8
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
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
1.91
1.36
OFF
OFF
ON
2.37
1.69
ON
ON
OFF
2.84
2.03
OFF
ON
OFF
3.31
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. Pins of motor & power:

Motor and power pins
1
A+
Motors wiring

2
A-
3
B+
4
B-
5,6
DC+ DC-
Power supply
Power supply ：DC18-50VDC

3. Power supply:

The power of this power supply is 350Watts, and the output voltage/current is 36VDC/9.7A.

4. Breakout board:

Description:
• Built in DB25 male connector.
• DB25 Output Pin:P1,P2,P3,P4,P5,P6,P7,P8,P9,P14,P16,P17.
• DB25 Input Pin: P10,P11,P12,P13,P15.
• DB25 GND Pin: P18-P25.
• Power supply: +5V DC.
• Built in C-class Optical-coupler.
• High quality with Surface-mount Tech.

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