Leadshine AM822 drivers purchased!

[Agathon]

Many thanks for your replies Gerry and Neale.

I have three Astrosyn motors on the machine two L709s (x&y) with an inductance of 7.7mH and one L259RE (z) with 3.5mH - both physically the same and both with the same torque (2.8 and 4.3 amps respectively). I've used Nema34 motors as that's what the original stepper motors were and these bolt straight on with no modification.

I've changed over to parallel connection and set the driver to 5.86A rms and it's much, much better. Motor heating much lower too.

I had the drivers set to 32 microsteps since this seems to give the best compromise between speed and smoothness. Just to address Neale's point about steps - the feedscrew is 4mm pitch. 200 steps = one rev/4mm travel. At x32 = 6400. 6400/4 = 1600 = 1/4 rev or 1mm travel.

Having it set at 32 microsteps means that I can't go faster than around 1000mm/min which is a bit slow for rapids, but I can live with it. I've just knocked the drivers down to 8 mcstps and set the travel at 1800mm/min and this works well except that the "sensorless stall" protection trips from time to time. I'm guessing this is down to the power supply not being up to it.

Any recommendations for a source of an unregulated power supply?

Finally, I'm keen to use the Protuner software, but my computer doesn't have an RS232 serial port - any advice on how to connect?

Thanks again David

[Ger21]

I bought the Leadshine RS232 cable, and a USB to RS232 adapter cable, and run Protuner on my laptop. It works fine.

With ProTuner, I set my current reduction to 30%, to keep my motors even cooler.

[Agathon]

I bought the Leadshine RS232 cable, and a USB to RS232 adapter cable, and run Protuner on my laptop. It works fine.

With ProTuner, I set my current reduction to 30%, to keep my motors even cooler.

Many thanks Gerry - is there anything special about the Leadshine cable? I wonder if a standard RJ11 plug to USB adapter would work.

[Ger21]

Not sure. I posted the pinout info in another thread. http://www.mycncuk.com/threads/10842...1052#post91052

[Agathon]

Not sure. I posted the pinout info in another thread. http://www.mycncuk.com/threads/10842...1052#post91052

Thanks Gerry, that helps. If I can find the pinouts from the RS232 to USB then I'll knock-up a cable.

Best regards David

[Ger21]

Thanks Gerry, that helps. If I can find the pinouts from the RS232 to USB then I'll knock-up a cable.

Best regards David

A USB to RS232 adapter is not just a wiring adapter. It has a chip and other electronics, and requires a Windows driver. So while you can make your own RS232 to RJ11 cable, you'll still need to purchase a USB to RS232 adapter.

[Agathon]

A USB to RS232 adapter is not just a wiring adapter. It has a chip and other electronics, and requires a Windows driver. So while you can make your own RS232 to RJ11 cable, you'll still need to purchase a USB to RS232 adapter.

Ah, OK - just wasted the last hour knocking up an adapter! Back to the drawing board.

[Clive S]

Many thanks Gerry - is there anything special about the Leadshine cable? I wonder if a standard RJ11 plug to USB adapter would work.

There is no problem making your own if I remember correctly there is only 4 wires. I am away at this time but I seem to think the pin out was on the website leadshine


Edit https://oceancontrols.com.au/LSK-001.html

[Agathon]

There is no problem making your own if I remember correctly there is only 4 wires. I am away at this time but I seem to think the pin out was on the website leadshine

Thanks Clive, I'll take a look.

BR David

[Clive S]

Thanks Clive, I'll take a look.

BR David

I have added link 3 wires try 2 and 3 both ways