Regulated Or Unregulated Power Supply; Power Supply Sharing; Selecting Supply Voltage - Leadshine Technology 3DM580S User Manual

3DM580S 3-Phase Digital Stepper Drive User Manual

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 .
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 Therefore, the average current withdrawn from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 3DM580S 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.

6.3 Selecting Supply Voltage

The 3DM580S is designed to operate under 74VDC 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.
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