Electrical specs?


#1

I’m looking for a bit of documentation regarding the electrical specs.

Automat:

  • What is the voltage used to drive the solenoids (or other actuators)?
  • What is the max current?
  • Is there some kind of protection against over current or short circuit?

Solenoids:

  • Rated voltage?
  • Current consumption?

#2

@murmichel good that you are asking about this information.

dadamachines - automat specs:

Input

  • USB Powered - only for development / hacking without Actuators connected.
  • DC Powered - Power Supply 9V-24V - DC Barrel Plug 2.5 x 5.5mm Center Positive - 8A max current (protected by 5x20mm Cartridge Fuse (Feinsicherung)
  • The Power Supply coming with the automat toolkit has 24V - 160W - 6.6A

Output

  • DC Outputs are always the same voltage you feed the automat - each Channel is limited to 1.4A current
  • The switching Transistor / MOSFETs for the Outputs are protected (Overload protection, Short circuit protection, Overvoltage protection, Current limitation and Thermal shutdown with auto restart)
  • Each Output has a Flyback Diode for protection against inductive loads

FYI added this info to the dadamachines website as well: https://dadamachines.com/getstarted/automat-specification/

dadamachines - automat toolkit - solenoids


#3

Thanks.

To be clear, is the output voltage (roughly) the same as the input voltage? I.e., with a 24V power supply, do I get 24V at the outputs?


#4

@murmichel Yes. The Outputs are the same voltage you feed the automat. The automat is switching the Ground connection.

Schematic layout of the Output Channel(s)… looks like this.


#5

Can someone with a better understanding of EE than me explain whether/why it is a good idea to switch the ground connection?

I would have expected that the supply voltage were switched. Considering that ground or something close to it is everywhere, there’s a failure case were the supply voltage is present at a solenoid and the other connector inadvertently touches ground.