We have what we feel is not a unique situation and were wondering if anyone might of run across this challenge and know more about the requirements. We are building a small machine system that includes some pneumatic components and some heated plates inside a small guard system. We include emergency stops on the machine and if they are actuated it removes all electric current and dumps all air pressure from the machine. We have several electrically interlocked doors that can be opened to access the interior, but the question is what are the requirements for risk mitigation when that happens?
We are not sure if we need to have these doors act like an emergency stop or can we have them act as a system pause. We would definitely halt and prevent all machine motion by mechanical or pneumatic actuation but do we need to dump air and electric power? We would rather keep the heaters on as loosing temperature for a quick opening of the doors, such as to clear a jam, would create a loss of production by forcing a restart and re-calibration of the thermal systems.
When an access door is opened is halting the machine acceptable if all functions are locked via the controls and exposure to any live circuits is prevented, along with suitable warning decals displayed in regard to the heated plates? Have searched thru OSHA and other requirements and tough to nail this one down.
Thanks in advance for your help.