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EM532MINI Digital Stepper Drive User Manual
or the bipolar current rating by 1.4, to determine the peak output current.
Figure 10: 8-lead motor parallel connections
6. Power Supply Selection
The EM532MINI can power medium and small size stepping motors (frame size from NEMA11 to 17) made by
Leadshine or other motor manufacturers. 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.
6.1 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 LSP 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 Therefore, the average current withdrawn from power supply is considerably less than motor current.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.
6.2 Power Supply Sharing
Multiple EM532MINI 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.
6.3 Selecting Supply Voltage
The EM532MINI 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. Ideally it is suggested to use a power supply with the output voltage of
24VDC or 36VDC, leaving room for power line voltage fluctuation and back-EMF.
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