1. When the emergency stop is lifted, the machine cannot be suddenly restarted
2. In case of failure of the safety circuit of the machine, the power supply of the machine can be stopped
3. When the safety circuit fails, the machine can no longer be started
If it is not possible to confirm the safety of inputs such as safety switches and light curtains, how can we achieve a safety circuit? Is dual circuitry fine?
A: Dualization alone is not enough.
Dualization is necessary, but in addition to the following conditions, it is necessary to check each other of the dualized circuits, confirm that all safety circuits have been disconnected once, and if necessary, the operator can operate and start them. On the other hand, it is necessary to prevent sudden start-up of the machine if the input switch wiring is short-circuited or the wire sheath is damaged and the ground connection may be damaged.
In fact, in order to facilitate the composition of safety circuits, safety relays and other components are combined, and the products that form circuit modules with basic emergency stop circuits and safety circuits are called safety relay modules.
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Confirm safe input such as safety switches, light curtains, etc.
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