Two Hand, No Tie-Down (THNTD) Safety Circuit

Rob �ǳ�web — Wed, 25 Jun 2014 04:56:41 +0000

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�ǳ�web’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

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

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

Cancel Output After Time Delay		A variation of Cancelable Output (above) where pneumatic delay valve such as �ǳ�web’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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THNTD

THNTD circuit

Two Hand No Tie Down

�ǳ�web Knowledgebase - Two Hand No Tie Down

Two Hand, No Tie-Down (THNTD) Safety Circuit