CS-D508 Closed-loop Stepper Drive User Manual
Motion Control Products Ltd. Tel.: (+44) 01202 599922
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 is better to use lower supply voltage to decrease noise, heating and improve reliability.
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’s RPS series. 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 Therefore, the average current withdrawn from power supply is considerably less than motor current.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-D508 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-D508 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 considered. 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-D508 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
