CS-D403 Closed Loop Stepper Drive User Manual
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5.1 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 and fast response for current change. If you prefer to a
regulated power supply, it is suggested to choose such a power supply specially designed for stepper/servo controls
such as Leadshine RPS series (
http://www.leadshine.com/producttypes.aspx?producttype=regulated-switching
). Or, in
the case when only normal switching power supplies are available, it is important to use “OVERSIZE” high current
output rating power supplies (for example, using a 4A power supply for 3A stepper motor) to avoid problems such as
current clamp. 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 Therefore, the average current withdrawn from power supply is considerably less than motor current.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.
5.2 Power Supply Sharing
Multiple CS-D403 drives can share one power supply to save space and 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.
5.3 Selecting Supply Voltage
The CS-D403 is designed to operate within 20-50VDC 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. Ideally it is suggested to use a power supply with the output of 20-48VDC, leaving
room for power line voltage fluctuation and back-EMF.
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.
6. DIP Switch Configurations
The CS-D403 has a built-in 8-bit DIP switch to set microstep resolution, motor direction, auto tuning switch and so on.
Figure 6 DIP switch Setting
