Toroidal power supply and Gecko stepper questions
19 May 2021 04:10 #209439
by rodw
This can be solved by adding a Thermistor that prevents the inrush. As it gets a bit hot, the thermistor resistance falls so the current increase is gradual. When I put in my toroids the supplier gave me a couple and I never trip a circuit.
Replied by rodw on topic Toroidal power supply and Gecko stepper questions
Only problem I had initially was the current draw when I turned on the power to the toroidal was too much for the circuit breaker I was using and it would trip. I replaced the circuit breaker with a "D"curve breaker and all is well.
This can be solved by adding a Thermistor that prevents the inrush. As it gets a bit hot, the thermistor resistance falls so the current increase is gradual. When I put in my toroids the supplier gave me a couple and I never trip a circuit.
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19 May 2021 11:08 #209482
by tommylight
Replied by tommylight on topic Toroidal power supply and Gecko stepper questions
15A termistors ???
That would require an RC timer and a relay, nowadays used on all the high power electronics even the chinese CO2 welders have it.
That would require an RC timer and a relay, nowadays used on all the high power electronics even the chinese CO2 welders have it.
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19 May 2021 12:13 #209492
by Clive S
Replied by Clive S on topic Toroidal power supply and Gecko stepper questions
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19 May 2021 13:04 #209501
by rodw
Nah, super simple when th eguy designing th etoroid is speccing the thermistor
Replied by rodw on topic Toroidal power supply and Gecko stepper questions
15A termistors ???
That would require an RC timer and a relay, nowadays used on all the high power electronics even the chinese CO2 welders have it.
Nah, super simple when th eguy designing th etoroid is speccing the thermistor
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19 May 2021 19:53 #209542
by PCW
Replied by PCW on topic Toroidal power supply and Gecko stepper questions
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19 May 2021 21:35 #209549
by rodw
Yes exactly. I thought it was a cool trick
Replied by rodw on topic Toroidal power supply and Gecko stepper questions
This kind of thing:
www.digikey.com/en/products/detail/ametherm/SG32/4862345
Yes exactly. I thought it was a cool trick
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19 May 2021 21:49 - 19 May 2021 21:49 #209552
by rodw
Replied by rodw on topic Toroidal power supply and Gecko stepper questions
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Last edit: 19 May 2021 21:49 by rodw.
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19 May 2021 22:40 #209563
by txtrone
Rod - What motors are you running? Are you using all the same motors and LAM drivers? Or do you have a mixture?
Replied by txtrone on topic Toroidal power supply and Gecko stepper questions
Shown here installed. Here we used 2 x 32 volt toroids because they were available. 64V 20 amp out. No need for any other circuitry.
Rod - What motors are you running? Are you using all the same motors and LAM drivers? Or do you have a mixture?
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19 May 2021 22:46 #209566
by andypugh
I have not had much luck with thermistors, but it is pretty simple to do it with a resistor and a relay if you add a bit of magic. And that magic is HAL.
What my lathe does is power the DC PSU through a 250W power resistor. It helps that the 8i20 drives report-back the bus voltage. (as does the STMBL). But this could just as easily be a software timer.
Once the bus voltage is near the nominal value, HAL sends an output to turn on a relay that bypasses the resistor.
Note that the resistor is not nearly big enough to run the machine full time, if the relay fails open-circuit then the resistor will too. But that's unlikely as they typically fail closed-circuit and then all that happens is that the RCD trips next switch-on.
My mill uses a custom 555 timer circuit. But only because I was younger and stupider.
Replied by andypugh on topic Toroidal power supply and Gecko stepper questions
This can be solved by adding a Thermistor that prevents the inrush.
I have not had much luck with thermistors, but it is pretty simple to do it with a resistor and a relay if you add a bit of magic. And that magic is HAL.
What my lathe does is power the DC PSU through a 250W power resistor. It helps that the 8i20 drives report-back the bus voltage. (as does the STMBL). But this could just as easily be a software timer.
Once the bus voltage is near the nominal value, HAL sends an output to turn on a relay that bypasses the resistor.
Note that the resistor is not nearly big enough to run the machine full time, if the relay fails open-circuit then the resistor will too. But that's unlikely as they typically fail closed-circuit and then all that happens is that the RCD trips next switch-on.
My mill uses a custom 555 timer circuit. But only because I was younger and stupider.
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19 May 2021 22:47 #209567
by thefabricator03
Replied by thefabricator03 on topic Toroidal power supply and Gecko stepper questions
I like how the thermistor is installed into the terminal. It makes for a clean installation.
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