JLand
Member
Specifically regarding de-energizing a machine that needs to be energized to avoid the introduction of additional risk, what you are talking about is a category 2 stop. Standards try their hardest to steer you away from using a category 2 stop after an e-stop button has been pushed, but with justification that a freewheel stop (category 0) and a controlled stop (category 1) cannot be used, a category 2 stop is appropriate.
You also hit upon an enabling function. This overrides the emergency stop and allows for safe, slow motion even with a safety function active. If you are going this route, you need a full safety system design. The inclusion of an enabling function without a even a risk assessment is dangerous to the operator and legally dangerous to your company. If you go with an enabling function, you really should reach out to a machinery safety engineering team.
You also hit upon an enabling function. This overrides the emergency stop and allows for safe, slow motion even with a safety function active. If you are going this route, you need a full safety system design. The inclusion of an enabling function without a even a risk assessment is dangerous to the operator and legally dangerous to your company. If you go with an enabling function, you really should reach out to a machinery safety engineering team.