Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Controlled Stop of a Machine - Air not Dumped

Controlled Stop of a Machine - Air not Dumped

Controlled Stop of a Machine - Air not Dumped

One of our service engineers wants to know if it is possible to bring one of our machines which we are still building on our own premises to a controlled stop but which doesn't actually dump the air in the system. Technically, in this scenario there should be no possibility of movement of pneumatic cylinders as the air already in the system will maintain them in their current position. What I want to know is does this contravene any EN standards?

Typically, when we bring machines to a controlled stop and then open the doors of an enclosure (usually a 3 to 5 second continuous holding down of the same stop button) to get inside a machine, the air will be dumped on opening the doors. In the above machine, vertically oriented cylinders have check valves to stop them dropping and risk assessment has been done already to make sure parts which are held (suction cups, mechanical grippers etc) are safe/unsafe to be dropped.

RE: Controlled Stop of a Machine - Air not Dumped

How badly does this action violate the tagout lock out, zero energy state, regulations, for the country this machine is going to be used in?
If this is to remove a mis-aligned part, what are the chances of the machine doing something unwanted while a guy has his hand in there?

You are judged not by what you know, but by what you can do.

RE: Controlled Stop of a Machine - Air not Dumped

Apologies, I never saw your reply til now. It doesn't appear to violate LOTO. However, we don't have an expert in-house who can verify that the pneumatic circuits are up to scratch from a safety perspective.

RE: Controlled Stop of a Machine - Air not Dumped

Since a long time has elapsed between my answer and this date I suspect that you may have a solution by now . Suffice it to say LOTO ensures that any machine is safe for an installer, operator, or maintenance man to stick their hand or any other body part into possible harms way without risk. Since you do not have an in house expert , can you hire a consultant to oversee your circuit diagrams and make sure you do not have any hidden surprises?

You are judged not by what you know, but by what you can do.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - Implementing a Multi-Domain System
IoT systems are multi-domain designs that often require AMS, Digital, RF, photonics and MEMS elements within the system. Tanner EDA provides an integrated, top-down design flow for IoT design that supports all these design domains. Learn more about key solutions that the Tanner design flow offers for successful IoT system design and verification. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close