1.Nema 23 stepper motor

 

2. Stepper motor driver- DM542A:

Detailed information

 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, whats 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, computer embroider machine, packing machines and so on.

Features:

l         High performance, low price

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

l         Supply voltage from 18VDC to 50VDC

l         Opto-isolated signal I/O

l         Overvoltage, under voltage, overcorrect, phase short circuit protection

l         15 channels subdivision and automatic idle-current reduction

l         8 channels output phase current setting

l         Offline command input terminal

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

l         High start speed

l         High hording torque under high speed

Electrical specification:

Input voltage	18-50VDC
Input current	< 4A
Output current	1.0A~4.2A
Consumption	Consumption:80W; Internal Insurance:6A
Temperature	Working Temperature -10~45?; Stocking temperature -40?~70?
Humidity	Not condensation, no water droplets
gas	Prohibition of combustible gases and conductive dust
weight	200G

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
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