Door safety switch inadequately protected

Safety switch waterproof equipment failure caused by insufficient capacity, a combination of Italian-made CNC machine tools during machining, machine parts exchange when the door is closed, after rising rotary table should be rotated after a station stop and whereabouts, but suddenly appeared after rising rotation is not stopped, the operator immediately press the emergency stop, but in vain, the operator  mcb circuit breaker  turn off the main power tools, was able to stop. Cause of the problem was eventually found safety switch lock protection is insufficient. There are two normally open contacts close when mechanical cam lock, two groups of  air circuit breaker  turned on, open the door to the switch when relying on the internal coil is energized to open the lock, two groups of contacts while disconnected before they can open the door. Cause machine failure is due to the contact between the two groups was the inflow of coolant on, send the wrong signal turns turntable motor solid state relays.