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MA860H Microstepping Driver Manual V1.0
separately.)
Selecting Supply Voltage
The power MOSFETS inside the MA860H can actually operate within 18 ~ 80VAC or +24 ~ +200VDC, 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
18 ~ 80VAC or +24 ~ +110VDC, 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
4
8
16
32
64
128
256
5
10
25
50
125
250
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. 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 connection methods. Phase currentm rating supplied
by motor manufacturer is important in selecting driver current, however the selection also depends on leads and connections. The
first three bits (SW1, 2, 3) of the DIP switch are used to set the dynamic current. Select a setting closest to your motor's required
current.
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Steps/rev.(for
1.8°motor)
400
800
1600
3200
6400
12800
25600
51200
1000
2000
5000
10000
25000
50000
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SW5
SW6
ON
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
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SW7
SW8
ON
ON
ON
ON
OFF
ON
OFF
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
ON
OFF
ON
ON
OFF
ON
OFF
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