7
Selecting Supply Voltage
The power MOSFETS inside the DM860 can actually operate 24 ~ +110VDC, 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 ~ +68VDC, leaving room for power fluctuation and back-EMF.
7.
Selecting Microstep Resolution and Driver Output Current
This driver uses an 8-bit DIP switch to set microstep resolution, and motor operating current, as shown below:
Microstep Resolution Selection
Microstep resolution is set by SW5, 6, 7, 8 of the DIP switch as shown in the following table:
Microstep
2
Steps/rev.(for 1.8°motor)
SW5
SW6
SW7
SW8
400
ON
ON
ON
ON
4
800
OFF
ON
ON
ON
8
1600
ON
OFF
ON
ON
16
3200
OFF
OFF
ON
ON
32
6400
ON
ON
OFF
ON
64
12800
OFF
ON
OFF
ON
128
25600
ON
OFF
OFF
ON
256
5
51200
1000
OFF
OFF
OFF
ON
ON
ON
ON
OFF
10
20
2000
4000
OFF
ON
ON
OFF
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
200
40000
OFF
OFF
OFF
OFF
Current Settings
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.
