Anaheim Automation MBC10P31 Guia do Utilizador descarregar pdf (Página 21)

#L010143 November 2003

When configuring the motor in a series configuration (connected from end to end with the center tap

floating) use the specified per Phase (or unipolar) current rating to determine the current setting potenti-

ometer value.

Reducing Output Current

Reducing the output current is accomplished by setting switch 1 of the DIP switch to the ON position and

occurs approximately 1 second after the last positive going edge of the step clock input. The amount of

current per phase in the reduction mode is approximately 70% of the set current. When the current

reduction circuit is activated, the current reduction resistor is paralleled with the current adjustment poten-

tiometer. This lowers the total resistance value, and thus lowers the per Phase output current.

Determining Output Current

The output current for the motor used when microstepping is determined differently from that of a full/half

step unipolar driver. In the MBC10641, a sine/cosine output function is used in rotating the motor. The

output current for a given motor is determined by the motors current rating and the wiring configuration of

the motor. There is a current adjustment potentiometer used to set the output current of the MBC10641.

This sets the peak output current of the sine/cosine waves. The specified motor current (which is the

unipolar value) is multiplied by a factor of 1.0, 1.4, or 2.0 depending on the motor configuration (series,

half-coil, or parallel).

Step Motor Configurations

Step motors can be configured as 4, 6, or 8 leads. Each configuration requires different currents. Refer to

the lead configurations and the procedures to determine their output current.

WARNING! Step motors will run hot even when configured correctly. Damage may occur to the motor if

a higher than specified current is used. Most specified motor currents are maximum values. Care

should be taken to not exceed these ratings.

6 Lead Motors

When configuring a 6 lead motor in a half-coil configuration (connected from one end of the coil to the

center tap), multiply the specified per Phase (or unipolar) current rating by 1.4 to determine the current

setting potentiometer value. This configuration will provide more torque at higher speeds when compared

to the series configuration.

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Anaheim Automation MBC10P31 Guia do Utilizador Página 21