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waross's latest activity

  • waross
    waross replied to the thread How to use the Variac.
    You may be correct.
  • waross
    waross replied to the thread Plastic grommets.
    The same as the HP of a Rolls Royce automobile engine. "Adequate"
  • waross
    waross replied to the thread Motors.
    Rotor speed equation at full-load. Rotor Speed = synchronous speed minus slip speed. The important value is the frequency seen by the...
  • waross
    waross replied to the thread How to use the Variac.
    What do you want to do with it? How a Variac works: The basic Variac has a winding around a toroidal core. One side of the winding is...
  • waross
    waross replied to the thread Very odd volt drop.
    How about some specs or good pictures of thee valve and of the power source?
  • waross
    waross replied to the thread Very odd volt drop.
    Not enough information. Your source may be failing. That would explain the intermittent with the old valve. The new valve may be faulty...
  • waross
    waross replied to the thread Motors.
    Slip speed in my world is synchronous speed minus actual speed. Typically 40 RPM to 60 RPM. Slip frequency is the frequency that is seen...
  • waross
    waross replied to the thread Very odd volt drop.
    If you replaced a DC solenoid with an AC solenoid on a DC circuit, that would be normal as the coil quickly burns out.
  • waross
    waross replied to the thread Should secondary protection consider xfmr inrush current?.
    Think about it; The primary inrush is fed from the grid. Where would an inrush on the secondary go?
  • waross
    waross replied to the thread Help a non-PLC guy with this control application.
    If I had a PLC for some other reason I would consider adding the shutdowns to the PLC. For shutdown only I would keep it simple.
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