Two Hand, No Tie-Down (THNTD) Safety Circuit
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Clippard’s VA-023 hand safety circuit module is a self-contained modular circuit board with all interconnections required to provide a Two-Hand, No-Tie-Down (THNTD) pneumatic circuit. Use of the VA-023 will assure simple and rapid installation of your Two-Hand-No-Tie-Down circuit. The main function of this control is to require a machine operator to use both hands to actuate the equipment, helping to insure that the operator’s hands are not in a position to be injured by the machine as it is in motion.
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Maintained Output |
Occurs as long as both palm buttons are held. Release of either button terminates the output (shipped in this configuration) How: Connect E to F using a piece of 5/32” O.D. tubing as a jumper |
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Momentary Output |
Gives a single output pulse that is about 50 ms in duration. How: Plug E with 5/32” Push-Quick Plug (11755 screw plug if using CM-023); F is open |
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Cancelable Output |
Terminates the output after a Normally-Open 3-way limit valve has been tripped, even if both palm buttons are held. How: Interpose Normally-Open 3-way valve or other circuit function |
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Cancel Output After Time Delay |
A variation of Cancelable Output (above) where pneumatic delay valve such as Clippard’s Model R-331 is set to cancel the output after a designated time interval has elapsed regardless of how long the buttons are held. How: Interpose Normally-Open 3-way delay valve (see R-331) |
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