stmbl servo drive setup with smart serial.

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04 Apr 2019 13:30 - 04 Apr 2019 13:31 #130284 by PCW
Normally for large drives the power supply is just:

Linevoltage --> inrush current limiter --> bridge rectifier --> large capacitor

No transformers or switching supplies needed...
Last edit: 04 Apr 2019 13:31 by PCW.

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04 Apr 2019 13:33 #130285 by andypugh
Rectifiers are easy, you must be looking in the wrong place.

www.ebay.co.uk/itm/273136909974

That sort of thing. Bolt it to the machine case (through the middle) and attach with faston crimps.

If you _need_ it to be DIN-mounted then consider modifying one of these:
www.ebay.co.uk/itm/223125816784

(I bought myself dozens as they are so handy for this sort of thing)

www.windpowerengineering.com/electrical/...nergy-80-a-currents/ shows an easy way to mount the thermistors, just use one to bridge between two DIN terminal modules. (be sure to keep it clear of other wiring, they get pretty warm)

On my machines I tend to take a more active approach to ICL, I use a power resistor initially, then bypass that with an SSR once the bus power is up. This is handled in HAL, and the drives are enabled by the same logic that bypasses the current limiting resistor.
The following user(s) said Thank You: silopolis

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04 Apr 2019 13:41 #130286 by andypugh

PCW wrote: Normally for large drives the power supply is just:

Linevoltage --> inrush current limiter --> bridge rectifier --> large capacitor

No transformers or switching supplies needed...


And for 1kW or so the internal caps in the STMBL are (apparently) OK.

So line voltage -> ICL -> Rectifier -> STMBL

I would probably use an SSR on one of those SSR DIN mounting plates, but with a metal plate sandwiched between the SSR and the mount. Bridge rectifier bolted to one side, power resistor bolted to the other. SSR controlled by HAL.
If several STMBL drives share the same input circuit then their internal capacitors all end up bussed together, which is actually helpful.
The reason I prefer an SSR to an NTC device is just that the NTCs get hot, and that bothers me.
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05 Apr 2019 16:30 #130348 by silopolis
Hello Jedis,

andypugh wrote: ...

PCW wrote: ...


Thought I was hijacking @skunkworks thread (sorry for that man), so opened another one for further help and education:

forum.linuxcnc.org/10-advanced-configura...-drives-power-supply

Thanks for the help already provided

@skunkworks please post another of these teasing videos to cover the noise I've made here ;)

Bests

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12 Apr 2019 19:25 #130742 by skunkworks
Will do... :)


silopolis wrote:
@skunkworks please post another of these teasing videos to cover the noise I've made here ;)

Bests

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12 May 2019 10:43 #133543 by 3D-Master
can you control normal brushed dc motors with dir and pwm signals with the stmbl? (no internal PID) Where can i buy one?

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14 May 2019 11:53 #133727 by andypugh
I think that the hardware would be capable, though it would be something of a waste of 33% of the power driver.
The firmware would need to be changed, and it currently doesn't work with PWM / DIR input as far as I know.
Also, the IRAM256 driver IC is currently unavailable, so there are no STMBLs available either until a new design is completed.

So, all things considered, I think that STMBL would be a bad choice for your application.

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