Stepper kill ideas? February 24, 2018 02:37AM |
Registered: 10 years ago Posts: 239 |
Re: Stepper kill ideas? February 24, 2018 02:45AM |
Registered: 10 years ago Posts: 14,672 |
Re: Stepper kill ideas? February 24, 2018 03:20AM |
Registered: 6 years ago Posts: 1,007 |
Re: Stepper kill ideas? February 24, 2018 10:13PM |
Registered: 10 years ago Posts: 239 |
Quote
dc42
If you are not driving a bed heater from 24V then you can use a small 24V PSU, in which case the stepper motors will only move a small amount after you kill the power. Another possibility is to wire an external reset button to the expansion connector.
"Braking" Damn good idea I do remember though reading in the Duet documentation that disconnecting the steppers while the board is under power could damage it. Is there a solution? whats the resistor for?Quote
MKSA
You put high Amp limit switches that will open the circuit to the motor coils and short circuit them (eventually through a low value resistor). The switches will suffer but braking effect guaranteed.
Re: Stepper kill ideas? February 25, 2018 02:15AM |
Registered: 10 years ago Posts: 14,672 |
Re: Stepper kill ideas? February 25, 2018 02:47AM |
Registered: 8 years ago Posts: 5,232 |
Re: Stepper kill ideas? February 25, 2018 01:15PM |
Registered: 6 years ago Posts: 1,007 |
Quote
Bill Clark
Quote
dc42
If you are not driving a bed heater from 24V then you can use a small 24V PSU, in which case the stepper motors will only move a small amount after you kill the power. Another possibility is to wire an external reset button to the expansion connector.
David, I have one of these power supplies. [www.ebay.com] Can I use that for testing? I would set the current limit to just above the set current for the single stepper?
"Braking" Damn good idea I do remember though reading in the Duet documentation that disconnecting the steppers while the board is under power could damage it. Is there a solution? whats the resistor for?Quote
MKSA
You put high Amp limit switches that will open the circuit to the motor coils and short circuit them (eventually through a low value resistor). The switches will suffer but braking effect guaranteed.
Re: Stepper kill ideas? February 25, 2018 03:41PM |
Registered: 9 years ago Posts: 483 |
Re: Stepper kill ideas? February 25, 2018 04:28PM |
Registered: 10 years ago Posts: 239 |
Re: Stepper kill ideas? February 25, 2018 08:42PM |
Registered: 10 years ago Posts: 239 |
its just a mechanism for testing. we are designing it now. lots of manual g-code input. wont be able engineer out my ability to potentially input something wrongQuote
etfrench
It's a faulty design if you can crash at high speeds. I'd put a limit switch in before your carriage can hit the end of its travel. You can test the distance it needs in the middle of the travel instead of the end.