M542T Microstepping Driver Manual V1.0
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6
cross interference,
DO NOT
daisy-chain the power supply input pins of the drivers. (Instead, please connect them to power supply
separately.)
Selecting Supply Voltage
The power MOSFETS inside the M542T can actually operate 24 ~ +100VDC, 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 +24 ~ +50VDC, 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
Steps/rev.(for 1.8°motor)
SW5
SW6
SW7
SW8
2
400
ON
ON
ON
ON
4
800
ON
OFF
ON
ON
8
1600
ON
ON
OFF
ON
16
3200
ON
OFF
OFF
ON
32
6400
ON
ON
ON
OFF
64
12800
ON
OFF
ON
OFF
128
25600
ON
ON
OFF
OFF
256
51200
ON
OFF
OFF
OFF
5
1000
OFF
ON
ON
ON
10
2000
OFF
OFF
ON
ON
25
5000
OFF
ON
OFF
ON
50
10000
OFF
OFF
OFF
ON
125
25000
OFF
ON
ON
OFF
250
50000
OFF
OFF
ON
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. 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 current 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.
