Wednesday, March 21, 2012

Schemes

Good morning!
The electronics part is ready so far, I'm thinking about its housing, and I'll get the machine this Thursday. In the meantime I've been studying the schemes I retrieved.
Unfortunately, they're not really complete...
Some interesting facts:
  • I expected different voltages, like 5V, 12V and 230V for the different parts. Nope. 100% 230V.
  • The program selector is most likely a pure electromechanical device. 
  • It switches pins on the motor control board on and off.
  • The level measurement is done with a pressure switch in a small tube and knows 4 states, 0, Level I, II and III.
  • The heating is pretty powerful in my opinion, 1950W.
  • It's a 230V AC single phase motor with a speedometer.
  • It seems like there are six different spinning speeds possible .
  • There are several safety devices like thermostats, motor protection switch, over tension switch, foam switch, cover lock switch...
Some reflections about that:
  • I think it's pretty comfortable that everything is directly in 230V, so I can hook up the pump, the electro valve and the heating directly to my relay board.
  • I'd love to keep the motor controller doing its work, because there are good things built in, like smooth run up, overcharge control and imbalance control.
  • I'll have to bridge some of the securities to keep it working and I hope that I don't grill it by trying out which and when.
  • I hope to be able to use only two relays for the motor, one for normal brewing, about 30t/min, and the second for spin drying. There are buttons labeled 700t/min and variomatic spin dry, that should reduce the revolutions to 700t/min instead of 1000t/min and run it up relatively smooth.
  • I've no idea yet, how the different speeds are achieved. If it's made with resistors I wouldn't care to mess around with it directly, without the controller. If it's done trough frequency transformation or other sorcery I'll be knee deep in... well, you got the point.
If somebody out there coincidentally already had to control such a motor, feel free to teach me in that witchcraft. 
But for now, wish me luck, those machines are heavy and I've to bring it down  from the third floor and back up to the fourth, without an escalator, of course...

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