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Cake day: June 5th, 2023

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  • That’s not what a fail-safe is. A fail-safe is just what it says: the device fails into a safe configuration. In this case, someone has to press a button to quench the magnet, which is not really a failure mode of the machine.

    A typical fail-safe is something like a solenoid valve. The valve has a default position when no power is given to the solenoid, and you should design your machine so that the default position is safe (whether that be open or closed). The most likely failure mode is a power loss, so the configuration is said to be fail-safe.