how to make the NEMA 17 4 wire bipolar stepper motor working?

Hi, All,
New to this forum. Do not know if this article goes to the right place.
I bought a new 4 wire bipolar stepper motor and motor driver from one company. The driver needs 5 V pulse to drive. So I am using a Digital I/O interface NI 6501 to generate this pulse as well as a high or low voltage output to control the direction. However, I cannot even drive the motor running. So I checked the input on the driver from the NI 6501. I do have a pulse generated 0-5 v. The direction output is right if not wired with the driver. When wired with the driver, it oscillates with the pulse. So wired. But the output from the driver between A+ and A- or between B+ and B- never changes. It is always 0 V for A phase and 24 V for B phase. Btw, the driver has a 24 V DC input power. Does anyone know what is happending? What can I do to test the driver chip?

Thanks,
Emily

It would help if you told us what driver you have and if possible a link to the driver.
Many drivers have an enable pin that needs to be set to run, have you checked this?

georgeG

Thanks, George.
This is the link of the driver.
https://www.circuitspecialists.com/s...er-qj-215.html
It does have a ENA pin. But the manual said this pin is 'motor free'.
Do I need a logic high voltage to enable this pin?

Quote:

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Originally Posted by george4657

It would help if you told us what driver you have and if possible a link to the driver.
Many drivers have an enable pin that needs to be set to run, have you checked this?

georgeG

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Have wired the ENA pin. The stepper motor is not running.:confused:

The only reference I could find on the internet was that enable had to be 5 volts. If it is not I would try it tied to 5 volts through a low value resistor (300 - 600 ohms) just to be safe.

When power is supplied is the motor locked in position or very hard to turn. This would indicate that the motor is hooked up correctly.

I can rotate the motor using my hand before wiring the ENA pin. After wiring, I cannot. The ENA pin should be wired. But still I cannot make the motor running...
Does NI 6501 a good choice here to generate a pulse? I used a oscillascope to monitor the pulse. It is good. I can easily generate a pulse with 50ms width.

Just checked again. When the power is on, even without the ENA pin wired, I can not turn the motor.