What is the role of safety relays ah? What is the principle?
Relay contact on demand action, auxiliary circuit on and off
The role of safety relays:
1, in the emergency stop before the lifting of the machine can not suddenly restart.
2, when the machine safety circuit failure, you can stop the machine power supply.
3, if the safety circuit fails, the machine can no longer start.
working principle:
Safety relay is a combination of several relays and circuits, in order to be able to complement each other's abnormal defects, to achieve the correct and low error of the relay full function, so that the lower the failure and failure value, the higher the safety factor, So need to design a variety of safety relays to protect different grades of machinery.
The so-called "safety relay" is not "no fault relay", it has a mandatory contact structure, in case of contact phenomenon occurs when the fuse can ensure safety, which is completely different with the general relay. The
The safety relay is used in the design of a safety circuit with a control to confirm the safety of the machine, to confirm the safety, and to control the input of the contactor.
