Only one additional wire is required for this function as shown. This function is optional, but is one explanation for four wires on the e-stop rather than two. The bottom switch closes when the button it pushed and remains closed to turn on a light to indicate that the machine has been locked out. ![]() The top contact stops the machine and prevents it from being restarted until the button is pulled out. The emergency stop shutoff button is marked "Lockout E-Stop." When pressed, the top contact opens and the bottom contact closes. In equipment where there is a higher risk of injury to personnel, the single relay K0 is replaced by a 'Safety Relay' (Sicherheitsrelais), with dual redundancy, to ensure fail-safe operation.įor your purpose, it would suffice to wire the NO contacts of K0 in the lines powering the circuits of the room. The NO contacts of K0 switch on the power to the equipment. The function is performed by an electromagnetic relay K0. This feature also prevents the equipment from automatically restarting after power is restored after a failure. The 'zero-volt safety' feature ensures equipment restart only after a start button S1 is actuated. To ensure that the equipment does not restart immediately after the mushroom button is released, a 'zero-volt safety' feature is provided. The mushroom button S0 is released, by rotating it, when the fault is cleared. The emergency latching push button switch, also known as a mushroom push button switch (Pilz Schaltgerät), is used to cut off, through it's NC contact, electrical power to a machine / electrical equipment under an emergency situation, to avoid injury to personnel or damage to the equipment. I made some pictures of the switch, maybe it's more clear from them.Īlso, I am from Germany (I know there are some local laws/rules regarding that.) That combination of switch/button has worked before, but unfortunately I did not remember the exact wiring. ![]() I suppose to do it safely I need a 5-wire cable between the button (which is on a central location in the room) and the switch (which is at the position where the power is coming out of the wall,) so I can send both phase wires over it without "relabeling" a ground wire as phase. It has 4 terminals, and I suppose I need to connect it to neutral, incoming phase and the outgoing phase (which is going to the switch,) but am unsure of the exact wiring. It is one of these that needs to be pulled out manually and stays there until pressed or power runs out, so the machines also don't restart if the power was cut externally and comes back. While I understand what to do in theory, I am not quite sure how exactly the button needs to be wired. I want to wire an emergency shutoff button to switch off the circuit of one room.
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