The safety relay is a safety loop with all the necessary control parts, which accepts the safety input, and after the internal circuit discrimination, the deterministic output switching signal to the control circuit of the equipment. To put it simply, the safety relay is a dual-channel signal type, and only when the signals of both channels are normal, the safety relay can operate normally; During operation, as long as either channel signal is disconnected, the safety relay will stop the output until both channel signals are normal and reset.
Safety requirements for safety relays:
1. When the emergency suspension is lifted, the machine cannot be suddenly restarted;
2. If the safety circuit of the machine fails, the power supply of the machine can be stopped;
3. When the safety circuit fails, the machine can no longer be started;
It is necessary to make the safety relay two-layered, but in addition, there are several conditions, such as the following conditions, the mutual inspection of the two-layer circuits, the recognition that all the safety circuits have been disconnected once, and the operation of the operator can be activated if necessary. On the other hand, it is necessary to prevent sudden operation of the machine if the input switch wiring is short-circuited or the wire sheath is damaged due to the possibility of grounding. 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 fundamental emergency stop circuits and safety circuits are called safety relay modules.
The safety relay is based on the planning of a safety circuit with an input that recognizes the safety of the machine, and after acknowledging the safety, the input of the contactor, etc., is operated.
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