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DMD870 Digital Stepper Drive User's Manual
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 DMD870 can actually operate within +24 ~ +80VDC,
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 the
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 +24 ~ +72VDC, leaving room for power fluctuation and back-EMF.
7. MICROSTEP RESOLUTION & DRIVE OUTPUT
CURRENT
Microstep resolutions and output current are programmable, the former can be set from
full-step to 102,400 steps/rev and the latter can be set from 0.5A to 7.0A. See more
information about Microstep and Output Current Setting in Section 13.
However, when it's not in software configured mode, this Drive uses an 8-bit DIP switch to
set microstep resolution, and motor operating current, as shown below:
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