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DM503 Fully Digital Stepper Drive Manual V1.0
7
Selecting Supply Voltage
The power MOSFETS inside the DM503 can actually operate within +20 ~ +50VDC, including power input
fluctuation and back EMF voltage generated by motor coils during motor shaft deceleration. Higher supply voltage can
increase motor torque at higher speeds, thus helpful for avoiding losing steps. However, higher voltage may cause
bigger motor vibration at lower speed, and it may also cause over-voltage protection or even driver damage. Therefore,
it is suggested to choose only sufficiently high supply voltage for intended applications, and it is suggested to use
power supplies with theoretical output voltage of +20 ~ +45VDC, leaving room for power fluctuation and back-EMF.
7. Configuring Microstep Resolution and Output Current
This driver uses an 8-bit DIP switch to set microstep resolution, and motor operating current, as shown below:
Microstep Resolution Configuration
Microstep resolution is set by SW5, 6, 7, 8 of the DIP switch
as shown in the following table:
Microstep
Steps/rev.(for 1.8°motor)
SW5
SW6
SW7
SW8
2
400
OFF
ON
ON
ON
4
800
ON
OFF
ON
ON
8
1600
OFF
OFF
ON
ON
16
3200
ON
ON
OFF
ON
32
6400
OFF
ON
OFF
ON
64
12800
ON
OFF
OFF
ON
128
25600
OFF
OFF
OFF
ON
5
1000
ON
ON
ON
OFF
10
2000
OFF
ON
ON
OFF
20
4000
ON
OFF
ON
OFF
25
5000
OFF
OFF
ON
OFF
40
8000
ON
ON
OFF
OFF
50
10000
OFF
ON
OFF
OFF
100
20000
ON
OFF
OFF
OFF
125
25000
OFF
OFF
OFF
OFF
Current Configuration
For a given motor, higher driver current will make the motor to output more torque, but at the same time causes more
heating in the motor and driver. Therefore, output current is generally set to be such that the motor will not overheat for
long time operation. Since parallel and serial connections of motor coils will significantly change resulting inductance
and resistance, it is therefore important to set driver output current depending on motor phase current, motor leads and