Emergency stop switch

[Mark P.Participant @markp]

[Mark P.Participant @markp]

Hello all can anyone give me an answer to this question.Is there a legal requirement to have an emergency stop switch fitted to a sawbench in an industrial setting?

 

Regards Pailo.

[JasonBModerator @jasonb]

See regulation 15

 

http://www.hse.gov.uk/pubns/priced/l114.pdf

 

The machine should also come to a halt withing 10 seconds so old machines may nee dbrakes fitting

 

J

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, where I used to work a few years back, the bench drills and the radial drill had a magnetic brake to the motor, this had some electrical wizardry which supplied DC into the coils somehow. The stop switches had to be within reach of the operator.

 

Regards Nick.

[JasonBModerator @jasonb]

Yes DC braking is the usual way to do it.

 

You do have to watch out if converting old saws to make sure the balde is pinned or there is some other method to stop the innertia in the blade from undoing itself if teh arbor comes to an abrupt halt. Also fitting heavy things like dado blades can overload the braking systems if the machine is not designed for them.

 

Jason

[WeldsolParticipant @weldsol]

Your E stop circuit should also drop out the start / stop circuit so that when the E stop is reset you have to restart the machine by the start / stop button.

There are combined Start / stop / E stop units for sale these have a holding coil for the start button which automaticaly drops out when the E stop is applied or there is a power outage this stops the machine from self starting when the power comes back on line.

This is a legal requirement in the machinery directive

 

 

Paul

Edited By Weldsol on 23/04/2011 09:28:02

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Paul, yes I can remember having to reset the machines after being activated by the E stop circuit, now that you mention it.

 

Regards Nick.

[Mark P.Participant @markp]

Thanks for the info,will be very useful.

Pailo

[TrevorhParticipant @trevorh]

Hi Pailo,

as a machine installer I can confirm that yes you do have to have a stop hard wired in such a way that it is impossible for an auto restart when the e stop is released, also the machine has to come to a complete stand still within 9 seconds, further more that the E stop must be no further than 1 meter from where the machine is operated from.

 

cheers

[vince piercentParticipant @vincepiercent76980]

Thought you might find a new article on emergency stops useful. It covers standards, codes and compliances so I thought it might help. Good luck. http://www.newark.com/jsp/bespoke/bespoke7.jsp?bespokepage=newark/en_US/landing/mro/2012/mro_onDemandJan.jsp http://www.newark.com/emergency-stop

Edited By vince piercent on 12/01/2012 16:48:02

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