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The reservoir capacitor in the unregulated power supply may have dried out due to heating.

No, no such problems here.

Check with the schematics, if you use an active low rather than active high (check polarity)
clock signal the effect of the torque control can be rendered ineffective...

Leave EN disconnected for the moment - its only purpose is to turn the driver off.

But you'll need to connect CLK-, DIR- to ground (0V) not to pin 14.

This driver is quirky in that you need to apply 5V across the enable opto isolator to disable it.

Try with the adjustment pot fully anti-clockwise, and
Try testing in full stepping mode -> WARN led might light immediately before any steps are applied

The driver features a reduced current...

A lit WARN led is an indication of over current or thermal shutdown.

If I understand correctly, the driver powers up with the PWR led lit, but after stepping
the WARN led comes on. At power-on in...

On these drives the phase current is reduced to 30% when the step pulses slow to a halt.
This is was problematic on my machine as the holding torque in that state allowed a 1.8deg movement in the...

Some pictures of the Haoyu TB6600 board.
The underside of the PCB is very messy and its worth while taking a look for solder splashes before first powering up.

C8 & C7 provide the decoupling for...

For comparison here's the waveform capture across the sense resistor (0.226R) of the Haoyu driver.

Settings are 1/8 ustep, 30RPM or a step rate of 800Hz, 2A per phase, Vsupply = 24.5V.

In case...

Glad you asked. I'll measure some actual TQ values.

I'm not a big fan of modulating the TQ in this way. I'd rather 100% current all the time. On a ball screw setup the possibility
of back...

I recently acquired a Haoyu TB6600 drive and thought some might find the following write-up of interest.

Looks can be deceiving but this little drive does get a number of things right.

For a...

Thanks Harryn,

I think you're right, you seldom go wrong by buying the best thing you can afford.

For what its worth the 9mm wide belt just looks the part, whereas the 6mm just seems too thin....

Hi,

I've settled on the GT2 belt style as being the most suitable for high speed movement of a light load (print head) along a single axis (90cm long).

But I don't know if 2mm or 3mm tooth...

I'd bought a 3 axis TB6560 board to test and used a scope to watch the current in one of the phases. The board was set in the finest micro step mode and I was expecting to see a voltage waveform...

I didn't mean a 50V supply for the TB6560 but for a new design, beside, it's difficult enough keeping the TB6560 alive at 24V.

>> besides what stepper will you use that potentially uses 5A and...

Trying to compete with $45 for a 3 axis Chinese controller, even one that you know to be riddled with design flaws is very difficult, especially when so many hopeful users are attracted by the price....

I share your sentiment, the TB6560 might survive in a modellers light duty foam cutter but otherwise become an exercise in fustration on the 'big irons'.

Re: Opto Isolation
I'm all for isolation,...

I know there are disappointments with the TB6560 stepper boards and issues with the authenticity of the same driver chips offered for sale on eBay.

But that said, would anyone be interested in...