CS1-D507S & CS1-D503S Closed Loop Stepper Drive User Manual
Page | 8
4. Motor Selection
The CS1-D507S & CS1-D503S are designed to power 2-phase (or 4-phase 0.9 degree) NEMA 8/11/17/23/24 stepper
motors under 5000-line incremental encoders. Leadshine offers many high performance closed loop stepper motors.
Notes
: Default closed-loop stepper motors is equipped with a 1000-line incremental encoder without Z signal, contact
Leadshine for stepper motor with 2500-line, 5000-line encoders and with Z ( Index) signal.
5. Power Supply Selection
The CS1-D507S & CS1-D503S can power small and medium size closed loop stepper motors (frame size from
NEMA17 to 24) from Leadshine. To get good system performance, it is important to select proper supply voltage and
output current. 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.
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 Therefore, the average current withdrawn from power supply is considerably less than motor current.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 CS1-D507S & CS1-D503S 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 CS1-D507S & CS1-D503S are 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.
