Safety Relays and How They Work

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Safety relays are tools where protection mechanisms are introduced. A safety relay should operate to reduce danger to an appropriate degree if a threat occurs. When a mistake happens, a secure and accurate solution should be triggered by the safety relay. Every safety relay has a different purpose. One may obtain complete control of a computer or plant by linking them to other safety relays.

Security relays are a quick and effective way to follow current safety requirements, resulting in secure activity and long service life for the employees and equipment. Decreasing danger should be a concern for every company, both to protect its workers and to reduce the likelihood of expensive injuries or repairing equipment. Generally speaking, if a risk can be prevented, then it should be.

Safety relays have several functions which are:

  • To stop movement in a fixed and stable manner.
  • To observe movable guards’ positions.
  • To intervene in a finishing movement during access.
  • Acts as an emergency off / stop. 

Security relays are simple to use, and have a straightforward layout. Because of this, no special training steps are needed for their usage. Generally speaking, all that is needed to run a safety relay effectively is some basic electrical expertise and some information of the requirements expected in your specific case. Because of its lightweight nature, good durability and most notably, the usage of safety relays has become widespread; the fact that they follow all the requisite requirements. They have become an integral component of every new plant or system which needs safety functions. Presently, safety relays are required for practically any possible need.

Commonly Used Settings

Light curtains

Light curtains function as a sort of tripwire and are used to shield workers with the ability to inflict damage in the area of moving equipment. When some of the device-generated infrared beams are interrupted, a stop signal is transmitted to the equipment concerned. Usually, light curtains are attached to a safety relay and then manages the specific phase of extracting the motive power from the danger. Few protection relays can also be fitted with a muting capability, which enables the device to be momentarily disabled. For instance, muting may enable artifacts to move through the curtains without tripping the protection relay.

Safety mats

Safety relays that are pressure-sensitive can be used in combination with protective mats to maintain employee health, and other protective measures may be substituted. For example, a set of light curtains may be set up to allow objects to pass through it while the safety mat is turned on, allowing access to load or unload a machine. Protection mats may also be used as a single protective precaution. Much like light curtains, when triggered, they can be programmed to invoke a stop signal.

Three-position devices

Protection equipment such as a three-position monitor may be necessary when troubleshooting an application and this group involves a range of devices. Three-positioned systems also have a pressure-sensitive joystick that is placed in a particular working position, so when the consumer lets go of the joystick, it can move to the normal stop location.

Magnetic switches

A magnetic switch is helpful in situations where closing a door or hatch is important, or intersecting or aligning two items with each other. When communication between the two sensors is lost, an immediate stop signal may be transmitted to the correct relay to avoid safe operation of the system. Magnetic switches are very small, making them convenient to place or cover when used in gates or switches. Since no mechanical interaction is needed for action, a magnetic switch always takes a long service life. Wind, soil, and dust do not impact magnetic switches, creating a range of climates and situations for their use.

Emergency stop buttons

Emergency Stop buttons or E-stop is used to interrupt a computer as it breaks down in a dangerous situation. All E-stop buttons are red in colour with yellow housing. Any emergency stop buttons may also have an emergency grab cable, allowing contact with the stop system even though the button itself is at a distance.

OMRON Safety Relays

One of the best examples of a safety relay is OMRON safety relays. Their safety relays are used for the design of protective loops for machinery and installations. They also have a forced guided mechanism which enables touch welding to be detected. The safety relays produced by OMRON are very reliable and guarantee safety.