safety siren

[potis]

hello to all.
i want to implement a siren to a robot cell but to inform the operator that the job is starting. what i actually want to do is when i press the external or the pp start button the siren will scream for a few seconds (so if someone is forgotten inside the cell to leave immediately or to press a emg button) and after these seconds to actually start the program and the running light to become green.  has anyone done this? what sequence and relays should i change in the ladder program?

 

[BwillieS]

Anyone inside your robot cell should have a lockout on the safety gate preventing the cell from running while they are inside.

[Pcarbines]

Hello Potis, yes we have done this on several UP 350X 's
Machines fitted with 200mm cutter milling motors , use the CIO
To turn on a timer with alarm/siren output followed by another output that is
Conditional on timer having timed out .
On start up  , the alarm Output is turned ON , when the timer times out the milling
Motor starts and alarm / siren turns off , we also keep flashing
Alarm light going for full period.

[potis]

Anyone inside your robot cell should have a lockout on the safety gate preventing the cell from running while they are inside.

the cell has safety curtains but when an operator goes inside when the robot is stopped, he does not pressing the  inside emg button. so if another operator just presses start the robot will start moving. with this way you give a small time to the "inside operator" to press immediately the emgbutton.

[potis]

Hello Potis, yes we have done this on several UP 350X 's
Machines fitted with 200mm cutter milling motors , use the CIO
To turn on a timer with alarm/siren output followed by another output that is
Conditional on timer having timed out .
On start up  , the alarm Output is turned ON , when the timer times out the milling
Motor starts and alarm / siren turns off , we also keep flashing
Alarm light going for full period.

correct. but i want to do this for the robot job and not for just an output. the cio has a lot of relays in order to give a green light for the robot job to start and this is what i am asking. i want to implement it on the cio because even if you press hold and then start the siren will scream anf afterwards the job will be put back to operation.

[tony gast]

This is a safety problem........A siren is not a safey

ANY automated robot cell that can be started by simply pressing the start button while someone is in the work envelope IS a safety hazard. Humans  must only be able to enter the cell thru a SAFETY GATE hard wired to the robots safety board.
SERVOs must be off and  deactivated while a human is in the work envelope unless they have the robot in teach and the teach pendant in hand.

If you are in the US see below

http://www.osha.gov/dts/osta/otm/otm_iv/otm_iv_4.html

[Jim Tyrer]

This is a safety problem........A siren is not a safey

And what Tony is saying is applicable in the EU too.
A robot should NEVER be in a motors on state when someone is inside the cell without having the pendant with them.

[rzapo]

I am agree with you. Human must be outside the working area when the robot is moving. only in teach mode is allow.

[potis]

dear all i also agree with you and all measures are taken at every cell. but imagine this please. the robot stops and the operator must enter the cell for checking sth. he puts the pp in teach and enters through the a light curtain entrance and WITHOUT PRESSING the inside EMG button for this reason. Now a second operator who cannot see operator 1 that is inside the cell switches the robot back to operation. got the picture? the operator is responsible of course  for this situation (he has not pushed the inside the cell emg button) but i want to have this just for precaution. i have seen many times that people enter the cells without following the proper way, fences been removed etc. unfortunately they do not think for safety until sth happens. i thought of this way in order to foresseen the "smart" operator.
 

[Jim Tyrer]

If the 1st operator takes the pendant into the cell with him then there is no problem and you do not need anything else.

[Pcarbines]

  We have all been there. , the OSH inspector with his own interpretation of the safety regulations.
I for one would much prefer to go the extra mile for that one company employee that "Can leap tall buildings in a single bound" , & install a piece of " Kryptonite" in close proximity to the machine.

[dannyboysd89]

My two cents...Sounds like you need additional safety measures put in place.
You could put in additional light curtains, or even better could put in the Keyence Safety Laser Scanner.
http://www.keyence.com/products/safety/safety/sz/sz.php

I have seen them in magazines before, but wish I had an application and probably some cash to use one as they look pretty cool and can cover up to 13.8' area.

Dan

[Jim C]

Anyone in the cell needs to have a deadman switch. The first operator has one on the pendant. If there is a second operator they too must have a deadman switch.

[Robodoc]

Jim C is 100% correct.

Motoman has provisions for a second enabling device to be added to the robot.  Please contact Motoman for a price on a second enabling device.

If you do not want to do this, any second operator MUST lock out the system before entering.  To follow your example, operator one goes in to check the robot and take the pendant with him.  Operator two, not knowing operator one is in the cell SHOULD go to get the pendant.  Seeing as the pendant is in the cell with operator one he MUST then put his lock on the cell before entering.

[BwillieS]

Jim C is 100% correct.

Motoman has provisions for a second enabling device to be added to the robot.  Please contact Motoman for a price on a second enabling device.

If you do not want to do this, any second operator MUST lock out the system before entering.  To follow your example, operator one goes in to check the robot and take the pendant with him.  Operator two, not knowing operator one is in the cell SHOULD go to get the pendant.  Seeing as the pendant is in the cell with operator one he MUST then put his lock on the cell before entering.

Are you sure that is correct? the second operator needs their own e-stop when walking into that cell.