Resetting the safety relay (e-stop circuit) must only allow re-start, not implement re-start.
The start function is not a safety function.
The stop/e-stop MUST override the start function.
Not sure what you mean by the way you are looking at the outputs of the safety relay.
Why would you have 3 devices to start?
Blue to reset, yes.
Green to start not acceptable under BS4163, key switch required, key switch can be used as a start under other standards. Both must be momentary.
A conventional stop button would not be part of the safety function, so, if there was an incident requiring e-stop and witnessed at the start location then an e-stop would be required.
These things are not the sort of thing that you can "get" over internet forums, you need to get the standards and study them, then get mentored really.
There are various commercial machinery safety courses, mine was the CMSE validated by TUV Nord.
Please don't "play" with this stuff, because people die in and around machinery and there was a recent case where a machine designer has I think done time, if not certainly been found guilty of manslaughter because his design was negligent.
What makes it worse is the actions of one of the parties involved resulted in the death of a family member, they basically burned to death, or suffered a heart attack due to the temperatures when they were trapped inside an oven.
So just like the guys pictured hugging on top of the burning wind turbine with no means of escape, he knew that he was going to die, and was just sat/stood there waiting to die.
Horrible, so just realise that machinery safety is not something to take lightly.
The start function is not a safety function.
The stop/e-stop MUST override the start function.
Not sure what you mean by the way you are looking at the outputs of the safety relay.
Why would you have 3 devices to start?
Blue to reset, yes.
Green to start not acceptable under BS4163, key switch required, key switch can be used as a start under other standards. Both must be momentary.
A conventional stop button would not be part of the safety function, so, if there was an incident requiring e-stop and witnessed at the start location then an e-stop would be required.
These things are not the sort of thing that you can "get" over internet forums, you need to get the standards and study them, then get mentored really.
There are various commercial machinery safety courses, mine was the CMSE validated by TUV Nord.
Please don't "play" with this stuff, because people die in and around machinery and there was a recent case where a machine designer has I think done time, if not certainly been found guilty of manslaughter because his design was negligent.
What makes it worse is the actions of one of the parties involved resulted in the death of a family member, they basically burned to death, or suffered a heart attack due to the temperatures when they were trapped inside an oven.
So just like the guys pictured hugging on top of the burning wind turbine with no means of escape, he knew that he was going to die, and was just sat/stood there waiting to die.
Horrible, so just realise that machinery safety is not something to take lightly.
