Solenoid Valve

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How the Solenoid Valve works:

The solenoid valve is an electronically actuated 3-way air valve. Its purpose is to direct input facility air pressure (80-120 psi) into the internal pneumatic brake assembly. The switch is wired for energize to clamp or energize to unclamp depending on the machine control logic.

Symptoms of failure:

The machine control will show and air clamp or unclamp failure alarm. This alarm will disable the table and will not allow it to rotate.

Typical causes for failure of the pressure switch:

  1. Age or exceeding the designed cycle life of the switch.
  2. Internal corrosion caused from moisture and improperly filtered air.
  3. Air pressure drops below 40 psi or a total loss of facility input air pressure.
  4. Improper wiring or intermittent connection of the pressure switch leads to
    the terminal strip.
  5. Loss of air supply or improper plumbing of the solenoid valve.
  6. The solenoid valve supplied and machine control coil voltage are not compatible.

Solenoid Valve replacement:

  1. Turn off machine power and disconnect all electrical cables and pneumatic lines from
    the Rotary Table.
  2. The solenoid valve is mounted to the inside of the motor enclosure lid. To gain access,
    free the lid by removing the 6 phillips head screws then pull the lid away from the
    enclosure paying special attention not to damage the gasket seal.
  3. Locate and depress the red button on the top of the solenoid valve to ensure proper
    actuation. If the valve does not actuate properly refer to the above instructions on cause of failure.
  4. If valve failure is determined replace it by first noting the location of the leads on the
    terminal strip then disconnect the two leads.
  5. Disconnect the two air lines by pushing the retaining ring on the air fitting and pulling
    the air line free.
  6. Remove the physical valve from the brass fitting by rotating it C.C.W. until free.
  7. Thread the new valve into the brass fitting then connect the two air lines and two leads to the previously noted positions.
  8. Test the valve for proper fit and function.