Parallel Connection; Power Supply Selection; Regulated Or Unregulated Power Supply; Power Supply Sharing - Leadshine Technology DM542E User Manual

2-phase digital stepper drive

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DM542E Digital Stepper Drive User Manual

5.3.2 Parallel Connection

An 8 lead motor in a parallel configuration offers a more stable, but lower torque at lower speeds. But because of the

lower inductance, there will be higher torque at higher speeds. Multiply the phase (or unipolar) current rating by 1.96,

or the bipolar current rating by 1.4, to determine the peak output current.

Figure 8: 8-lead motor parallel connections

The DM542E can power medium and small size stepping motors (frame size from NEMA17 to 24) 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.

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 Therefore, the average current withdrawn from power supply is considerably less than motor current.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.

Multiple DM542E 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.

The DM542E is designed to operate within +20 - +50VDC voltage input. When selecting a power supply, besides

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