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DM542E Full Digital Stepper Drive Manual V2.0
6. Power Supply Selection
The DM542E can match medium and small size stepping motors (frame size from NEMA17 to 34) made by Leadshine
or other motor manufactures around the world. To achieve good driving performances, it is important to select supply
voltage and output current properly. Generally speaking, supply voltage determines the high speed performance of the
motor, while output current determines the output torque of the driven motor (particularly at lower speed). Higher
supply voltage will allow higher motor speed to be achieved, at the price of more noise and heating. If the motion
speed requirement is low, it's better to use lower supply voltage to decrease noise, heating and improve reliability.
Regulated or Unregulated Power Supply
Both regulated and unregulated power supplies can be used to supply the drive. However, unregulated power supplies
are preferred due to their ability to withstand current surge. If regulated power supplies (such as most switching
supplies.) are indeed used, it is important to have large current output rating to avoid problems like current clamp, for
example using 4A supply for 3A motor-drive operation. On the other hand, if unregulated supply is used, one may use
a power supply of lower current rating than that of motor (typically 50%～70% of motor current). The reason is that
the drive draws current from the power supply capacitor of the unregulated supply only during the ON duration of the
PWM cycle, but not during the OFF duration. Therefore, the average current withdrawn from power supply is
considerably less than motor current. For example, two 3A motors can be well supplied by one power supply of 4A
rating.
Multiple Drives
It is recommended to have multiple drives to share one power supply to reduce cost, if the supply has enough capacity.
To avoid cross interference, DO NOT daisy-chain the power supply input pins of the drives. (Instead, please connect
them to power supply separately.)
Selecting Supply Voltage
The power MOSFETS inside the DM542E 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 drive 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. Selecting Microstep Resolution and drive Output Current
This drive 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 switches as shown in the following table:
6
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