kallileo
Lifetime Supporting Member
Hypothetically we have a machine with safety door switch and a E-Stop.
The operator places the work piece into the machine, the door is closed and the operator pushes the START button on the HMI so the machine can start processing the work piece.
In case the E-Stop is pressed or the door opens during operation the power is removed from the actuator and the machine is stopped immediately (Stop
category 0).
Question 1.
Can the E-Stop and the safety limit switch be wired in series into the safety relay?
When the processing of the work piece has completed successfully, the machine is stopped and the operator opens the door to remove the finished work piece, place a new one and closes the door.
In order to restart the process he has to reset the safety relay manually using hardwired RESET push button.
Question 2.
Is it allowed to reset the safety relay automatically from the HMI when the operator presses the START button without using the hardwired RESET push button?
The operator places the work piece into the machine, the door is closed and the operator pushes the START button on the HMI so the machine can start processing the work piece.
In case the E-Stop is pressed or the door opens during operation the power is removed from the actuator and the machine is stopped immediately (Stop
category 0).
Question 1.
Can the E-Stop and the safety limit switch be wired in series into the safety relay?
When the processing of the work piece has completed successfully, the machine is stopped and the operator opens the door to remove the finished work piece, place a new one and closes the door.
In order to restart the process he has to reset the safety relay manually using hardwired RESET push button.
Question 2.
Is it allowed to reset the safety relay automatically from the HMI when the operator presses the START button without using the hardwired RESET push button?
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