TB6600 Schematic for University Project

[towfiq]

Hi everyone,

I’m working on a university project involving two stepper motor control, and I’ve chosen to use the TB6600 stepper driver for its reliability and ease of use. As part of the project, I’ve designed a custom schematic using the TB6600, but after proceeding with PCB fabrication, the I am having voltage reading in motor coils, but motor is not moving(NEMA 23). I’d really appreciate it if someone with more experience could take a look and provide feedback.

I’m particularly concerned about whether:

• My logic level connections are appropriate.
• I’ve handled the enable/reset pins is correct or no.
• The motor power supply section is adequately protected.
• Any passive components (e.g., current sense resistors, flyback diodes, etc.) are missing or incorrectly chosen.

I’ve attached my schematic below.
Could someone please let me know if there are any issues or risks in my design?
If anyone has a known-good reference schematic for the TB6600 that I could use for comparison or inspiration, that would also be incredibly helpful.

Thanks in advance for your support – I really value the expertise in this forum!

Best regards,
Towfiq

[Jim_Remington]

Please report on what have you done to debug the PCB and the results of that investigation.

At the very minimum, with the board powered up and in an operational state, you should already have gone through it with your multimeter, checking whether power and logic voltages on the PCB input, PCB output and individual driver chip pins are what you expect them to be.

[towfiq]

yes, I tried first by uploading a program which will give step pulse for a stepper motor after 1500 milliseconds, and after 4 step pulse it will change the DIR pin state, and I connected multimeter, one terminal on ground pin, others on Step,Dir, 1A,1B,2A,2B. the result was fine, i got 5V on step and dir, and in motor coils i got 8V VDC in each step

[Jim_Remington]

The next step is to check the motor wiring, and that the appropriate motor voltages reverse during the step sequence.