SM 74 air pressure error

Discussion in 'Heidelberg Printing Presses' started by Waldos1, Nov 28, 2018.

  1. Waldos1

    Waldos1 New Member

    Joined:
    Jan 2017
    Messages:
    3
    Location:
    Memphis,Tn
    Getting a red light showing insufficient pressure. Compressor is ok. For some reason the sensor is not allowing the valve to open.
     
  2. junker1984

    junker1984 Senior Member

    Joined:
    Jan 2010
    Messages:
    597
    Location:
    US, Midwest
    Could be your I/O (EAK) board. In which case, there wouldn’t be 24V at the plug. Check w/ meter. I’ll f 24v is present, you’d have a failed or fouled pressure release valve.
     
  3. Waldos1

    Waldos1 New Member

    Joined:
    Jan 2017
    Messages:
    3
    Location:
    Memphis,Tn
    Ok thanks. I will check that out. For now we have installed a potentiometer to bypass the sensor.
     
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