Anaheim Automation MBC10P31 Guia do Utilizador descarregar pdf (Página 7)

January 2013L010197

Setting the Output Current

The output current on the MBC05641 is set by an onboard potentiometer. This potentiometer determines

the per phase peak output current of the driver. The relationship between the output current and the po-

tentiometer value is as follows:

Peak Current Potentiometer Setting Peak Current Potentiometer Setting

0.5A 0% 3.0A 60%

0.6A 10% 3.5A 70%

0.9A 20% 4.0A 80%

1.5A 30% 4.5A 90%

2.0A 40% 5.0A 100%

2.5A 50% -- --

Reducing Output Current

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

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

rent per phase in the reduction mode is approximately 50% of the set current. When the current reduction

circuit is activated, the current reduction resistor is paralleled with the current adjustment potentiometer.

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

Determine 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 MBC05641, 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 conﬁ guration of

the motor. There is a current adjustment potentiometer used to set the output current of the MBC05641.

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

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

half-coil, or parallel).

Step Motor Conﬁ gurations

Step motors can be conﬁ gured as 4, 6, or 8 leads. Each conﬁ guration requires different currents. Refer

to the lead conﬁ gurations and the procedures detail above to determine their output current.

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

a higher than speciﬁ ed current is used. Most speciﬁ ed motor currents are maximum values. Care should

be taken to not exceed these ratings.

Table 8: Output Current POT Settings

Refer to Table 6 for speciﬁ c motor current settings.

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