Discuss Does a 20amp emergency stop button exist? in the UK Electrical Forum area at ElectriciansForums.net
No I think they require just a stopWelcome to the forum mate.
Who has asked for an "Emergency Stop Button"?
Has it got to be an "Emergence" stop button or just a stop button?
The reason why I ask is if you are fitting an "Emergency Stop Button" to a circuit you have to do a risk assessment to determine what category of Emergency Stop is required. There is a lot more to it than just bunging in a stop button.
No I think they require just a stop
Button for quick isolation. It’s for a training environment.
You are missing the point.
Just noticed you need 20amp, you may need to add a contactor.
Safe torque off (STO)Responding to the input signal from external equipment, the STO function shuts off power to the servo motor electronically using the internal circuit (shuts off through secondary-side output). This function corresponds to the Stop category 0 of IEC/EN 60204-1. | |
Safe operating stop (SOS)This function monitors the position of the servo motor not to deviate from the specified range. Power is still supplied to the servo motor during the SOS function. | |
Safe direction (SDI)This function monitors whether the servo motor moves in the command direction. If the servo motor moves in a different direction from the command direction, the STO function is executed. | |
Safe stop 1 (SS1)Responding to the input signal from external equipment, the servo motor starts to decelerate. After the set delay time for the motor stop is passed, the STO function starts. Monitoring the servo motor deceleration based on the motor deceleration rate is also supported. This function corresponds to the Stop category 1 of IEC/EN 60204-1. | |
Safe brake control (SBC)The SBC signals are outputted for external brake control. | |
Safely limited increment (SLI)This function monitors the travel distance of the servo motor not to deviate from the specified range. If the travel distance exceeds the range, the STO function is executed. | |
Safe stop 2 (SS2)Responding to the input signal from external equipment, the servo motor starts to decelerate. After the set delay time for the motor stop is passed, the SOS function starts. Monitoring the servo motor deceleration based on the motor deceleration rate is also supported. This function corresponds to the Stop category 2 of IEC/EN 60204-1. | |
| Safely limited speed (SLS)This function monitors the speed of the servo motor not to exceed the specified speed limit. If the speed exceeds the limit, the motor power is shut off by the STO. |
Safe speed monitor (SSM)The SSM signals are outputted when the speed of the servo motor is below the specified speed limit. | |
Safely limited torque (SLT)This function monitors the torque (or the thrust) of the servo motor not to deviate from the specified range. If the torque (or the thrust) exceeds the range, the STO function is executed. |
I'm not missing the pointYou are missing the point.
An Emergency Stop, depending on its use and risk assessment of its purpose may need to be far more than just a switch with a red button on the end of it.
Adding a contactor, can make the system less safe than a direct switch as you have no way of knowing if it is going to disengage when needed.
as above, there are different categories of emergency stop systems and it needs to be decided what category of stop system needs to be designed and installed.
If you have little knowledge of industrial control systems and emergency stop systems, you would be well advised to pass up the job for your own good.
YesSo it's for isolating the power to a training area?
You are missing the point.
An Emergency Stop, depending on its use and risk assessment of its purpose may need to be far more than just a switch with a red button on the end of it.
Adding a contactor, can make the system less safe than a direct switch as you have no way of knowing if it is going to disengage when needed.
as above, there are different categories of emergency stop systems and it needs to be decided what category of stop system needs to be designed and installed.
If you have little knowledge of industrial control systems and emergency stop systems, you would be well advised to pass up the job for your own good.
Sorry, but you are.I'm not missing the point
I'm aware of different types of emergency stop systems
But he said:
j_arney said:
No, I think they require just a stop
Button for quick isolation. It’s for a training environment.
Sorry, but you are.
A training environment may well bring in added risks that are not there in the normal working environment.
I.e. In the work environment, if you are to be working on electrical systems you should have a good grasp of safe isolation and testing procedures.
In training, mistakes happen and the idea of an emergency stop is a good one.
however, if the training risk assessment relies on the fact that an instructor can kill the power if a danger appears and therefore reduces or removes that danger.
IT MUST HAVE A REALLY GOOD CHANCE OF WORKING CORRECTLEY!!
we do not know what the risk assessment is or how serious it may be if the emergency stop button fails to function when required so we should not be advising on how to do it.
Yes you can get a bench saw switch, I'm sure there are others thoughAppreciate all the info, but I just wanted to know if you could get a 20amp stop button. Do you know the answer to that?
j_arney said:Sorry, but you are.
A training environment may well bring in added risks that are not there in the normal working environment.
I.e. In the work environment, if you are to be working on electrical systems you should have a good grasp of safe isolation and testing procedures.
In training, mistakes happen and the idea of an emergency stop is a good one.
however, if the training risk assessment relies on the fact that an instructor can kill the power if a danger appears and therefore reduces or removes that danger.
IT MUST HAVE A REALLY GOOD CHANCE OF WORKING CORRECTLEY!!
we do not know what the risk assessment is or how serious it may be if the emergency stop button fails to function when required so we should not be advising on how to do it.
Thanks for your help. I think the contactor route will be better!Yes you can get a bench saw switch, I'm sure there are others though
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Yes you can get an emergency stop button that is rated at 20A,
however by fitting it you run the risk of being in court for corporate manslaughter or a number of other nasty legal challenges to your freedom.
in my opinion, after re reading what i have posted, i think the advice is sound.
you are of course free to take it on board and use it or ignore it.
Fair point, however I have never seen a training environment where the "training is wire up this spar pump"You are being ridiculous, you have no idea what he's switching it, maybe a spa pump for instance.
He simply asked if they did a 20 amp stop switch, and you accused me of missing the point, when in fact it was you who missed the actual question.
Fair point, however I have never seen a training environment where the "training is wire up this spar pump"
like I said, if the risk assessment deems it suitable then go ahead but i think it is a vital step that both you and the op are missing.
OP, has anybody done a risk assessment and if so, what stop category are you trying to design. also, is a single point of failure likely to bring a risk of significant harm to anybody?
I am done with this for tonight and my final thoughts are Simpley that on the face of it neither @mainline or @j_arney have the information and knowledge required to design a suitable safety system for this project.
As opposed to arguing the right and wrongs, what is your background.You have no idea what the project is ... and you deem it that neither me or the op have the knowledge required ???
Are you for real or is it that you can't stand the fact that you were wrong.
I also take umbrage at you saying I lack the knowledge when you have no idea what my background is.
Reply to Does a 20amp emergency stop button exist? in the UK Electrical Forum area at ElectriciansForums.net
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