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

Modular Circuit Assembly Tips

Rob �ǳ�web — Mon, 10 Dec 2012 21:26:10 +0000

Category:

Troubleshooting

Versatility is the key when it comes to
�ǳ�web’s Minimatic® Modular Valves.

Available in an unlimited variety of directional, flow, pressure and special control valves - each in a valve body designed to mount and link together with a simple piping system.

The piping system eases assembly and plumbing, resulting in reduced labor costs, errors in installation, and the potential for plumbing leakage. In addition, multiple valve elements

can be contained in a single body; providing incredible flexibility and variety to accomplish

a myriad of control challenges. The Minimatic modular valves are the supreme “Plug and

Play” devices for pneumatic applications.

Application Ideas for All Pneumatic Modular Circuits

Your Pneumatic Circuit

The first step in building a modular circuit is designing the pneumatic circuit using ANSI or simplified symbols.

We have chosen the Two-Hand, No-Tie-Down Circuit for this demonstration.

Specifications for the R-315 modular valve
Click here for more informatino on the Octoport port coding.

Octoport Diagrams

The next step is selecting the octoport diagram for each modular valve. Each �ǳ�web modular valve (R-series) has its own unique octoport diagram which is shown to the right of the ANSI symbol.

Components
for Modular Circuit

Next, you need to gather the required components. Typically, the modular portion of a circuit consists of modular valves, subplates, mounting strips, 1/16” and 1/8” fittings, 1/16” and 1/8” hose, and the main air supply connect fitting.

This List is:

R-315
R-401 (2)
MAV-3 (2)
PC-5E-BK (2)
R-102 (2)
R-101 (3)

MAC-B
11752-4
11755
11752-5

Tubing

Mounting Strip
& Subplate Assembly

The next step is assembling the mounting strips (R-102) and subplates (R-101/R-101-M5).

Install the fittings into the R-101/R-101-M5 subplates using the octoport, octoport port coding, and pneumatic circuit diagrams. Generally, 1/16” hose or 5/32" is used for pilot ports and their adjoining lines and 1/8” hose are

for supply lines and cylinders.

Looking at the Two-Hand, No-Tie-Down circuit:

1. Valve RV-1 has fitting 11752-5 (#10-32 to 1/16” I.D.

hose fitting) installed in ports 4 and 8

2. Fitting 11752-4 (#10-32 thd. to 1/8” I.D. hose

fitting) installed in ports 1 and 2 because port 1 is the

main air supply for the circuit and port 2 is the outlet.

3. On valves V-1 and V-2, fitting 11752-5 was installed

in both the inlet and outlet of each valve because both

valves are used for pilot actuation of valves RV-1 and RV-2.

Hose and barb sizes were picked with this particular pplication in mind. Both may vary to meet your needs. Feel free to contact our facility for technical support.

4. Being in a pilot line, the inline fixed orifice air choke

N-1 was fitted with an 11752-5 on one end and a UTO-2 universal “L” fitting on the other.

Connecting Hose

With the fittings installed, the circuit is ready for hose.

The color coding we use at �ǳ�web is quite simple.

Red hose is used for all supply lines. For all other hose

as many different colors as possible are used in order

to facilitate circuit trouble shooting.

1. Supply lines - Red hose

2. The 1/16” I.D. fittings require URH1-0402 hose

3. The 1/8” I.D. fittings require URH1-0804 hose

4. The main supply line was fitted with a MJQC-CB4

which can be attached to any of the MJQC valve

bodies.

Modular Valve Hookup

The final assembly step is installing the modular valves and mounting gasket to the subplates.

Hose and barb sizes were picked with this particular application in mind. Both may vary to meet your needs. Feel free to contact our facility for technical support.

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�ǳ�web Knowledgebase - THNTD

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

Modular Circuit Assembly Tips