DM542T(V4.0) Digital Stepper Drive User Manual
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6. Power Supply Selection
The DM542T(V4.0) can power medium and large size stepping motors (frame size from NEMA 11 to 24). To get 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.
6.1Power Supply Sharing
Multiple DM542T(V4.0) drives can share one power supply to reduce cost, if that power supply has enough power
capacity. To avoid cross interference, connect each stepper drive directly to the shared power supply separately. To
avoid cross interference, DO NOT daisy-chain connect the power supply input pins of the Drivers. Instead connect
them to power supply separately.
6.2 Selecting Supply Voltage
The DM542T(V4.0) is designed to operate within 18 - 50VDC voltage input. When selecting a power supply, besides
voltage from the power supply power line voltage fluctuation and back EMF voltage generated during motor
deceleration needs also to be taken into account. Please make sure leaving enough room for power line voltage
fluctuation and back-EMF voltage charge back.
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.
7. DIP Switch Configurations
The DM542T(V4.0) has one 8-bit DIP switch and one 1-bit selector. The first 8-bit is used to configure settings of micro
step resolution, output current, motor standstill current, pulse type and smoothing time as shown below.
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
The second 1-bit selector is located on the top (S2 in figure 2), used to configure the voltage of control signals. For the
safety of optically coupled, the factory setting is 24V,
which no need to connect 2K resistors like the old drives, making
it easier to use. When the voltage of the control signal is 5V, the S2 must be set to 5V, otherwise, the motor won't
work
.
7.1 Microstep Resolution Configurations
Idle Current
Output Current
Microstep
