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Inner Secrets of the Danfoss/Secop BD35/50 Motor Controller (aka Module)
Well I can't actually give away any real secrets, because I don't think anyone really knows what goes on under that mysterious black plastic shell except for the manufacturer, but I do know a fair bit about what can and does go wrong with them.
But first let's take a step back and recap on what the little black box actually does.
The current generation of small, mobile refrigeration compressors from Secop (formally Danfoss) utilize a very simple motor with just three equal windings and no brushes or slip-rings. These three windings terminate in three pins that protrude from the compressor shell and connect to a push-on plug connected to the controller.
It's the controller's job to take the 12v or 24v DC input and spit it out in sequence to each of the windings in turn, causing sufficient torque to turn the rotor and so push the piston in and out compressing the refrigerant gas. So the motor actually gets a modified DC signal, a form of AC in fact, and by varying the rate of delivery of the signal to each winding and effectively altering the frequency, we can make the motor turn at different speeds.
That's it. All pretty simple in theory. As a means of altering compressor speed, the controller uses the switched input from the thermostat, and by adding resistance to this circuit it alters the speed at which the compressor will run.
So what could possibly go wrong?
You’ll never see anyone waving to you out of a super-yacht window. That’s not because the occupants are stuck-up unsociables, but simply due to the fact that the windows don’t open.
No wind scoops or Sears window units for these amazing machines, but rather a highly complex and sophisticated HVAC (Heating, Ventilating, and Air-Conditioning) system.
So let’s say you strike oil in your garden and are thinking of ordering a superyacht (defined as being a vessel over 80’). You want only the best and so you want Climma to provide the air conditioning, but how and where does it all start?
Want to know the quickest way to get everyone warmed up at a Christmas party? Take your clothes off!
No, seriously, instead of trapping all that body heat under clothing, why not spread the joy and warmth of the season to those around you? And you won't get cold, I promise you.
You won't really "get cold", because technically "cold" does not exist, just different degrees of heat, all the way down to absolute zero, -273°C. You may well feel cold, but what you'll really be doing by removing your clothing
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