Anaheim Automation MBC10P31 Guia do Utilizador descarregar pdf (Página 31)

January 2013L010133

Step Motor Conﬁ gurations

The output current on the MBC15081 is set by the 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:

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.

MBC15081 Potentiometer Settings

Peak

Current

Potentiometer

Setting

Peak

Current

Potentiometer

Setting

0.30A 0% 1.02A 60%

0.42A 10% 1.14A 70%

0.54A 20% 1.26A 80%

0.66A 30% 1.38A 90%

0.78A 40% 1.50A 100%

0.90A 50% -- --

Reducing Output Current

Reducing the output current is accomplished automatically and occurs approximately 20mSec after the

last of the clock input has been received. The amount of current per phase in the reduction mode is ap-

proximately 70% 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.

Connecting the Step Motor

Phase 1 and Phase 3 of the step motor are connected to pins 1 and 2 on connector P2. Phase 2 and

Phase 4 of the step motor are connected to pins 3 and 4 on connector P2. Please refer to the ﬁ gure for

a typical APPLICATION HOOK-UP.

Note: the physical direction of the motor with respect to the direction input will depend on the connection

of the motor windings. To reverse the direction of the motor with respect to the direction input, switch the

wires on Phase 1 and Phase 3.

WARNING: DO NOT CONNECT OR DISCONNECT MOTOR WIRES WHILE POWER IS APPLIED!

Motor Selection

The MBC15081 is a Bipolar Microstep Driver that is compatible with both Bipolar and Unipolar Motor

Conﬁ gurations, (i.e. 8 and 4 lead motors, and 6 lead center tapped motors).

Step motors with low current ratings and high inductance will perform better at low speeds, providing

higher low-end torque. Motors with high current ratings and low inductance will perform better at higher

speeds, providing more high-end torque.

Since the MBC15081 uses a constant current source drive technique, it is not necessary to use a motor

that is rated at the same voltage as the supply voltage. What is important is that the potentiometer is set

to the appropriate current level based on the motor being used. Higher voltages will cause the current to

ﬂ ow faster through the motor coils. This in turn means higher step rates can be achieved. Care should

be taken not exceed the maximum voltage of the driver.

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