Tag Archives: safety relays

Safety is by Choice, Not by Chance.

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Phoenix Contact's Safety RelaysAre you selecting a safety relay just to meet the SIL3 requirements?

Who will be responsible for conducting the Proof Test to ensure it is still safety relays are still safe to use?

Which is critical? Safety relays without diagnostics or the Safety relays with diagnostics?

Safety is a Choice, Not by Chance

The graphics below explains the functional principle of the force guided /positive driven contacts in the event of a welded contacts and that’s where the normally closed contacts come into action to provide feedback to inform the system of the failure in relay contacts.

In this case when the relay is de-energized, the normally closed contact cannot close properly having a gap of 0.5mm.

Animation of how Force-guided relays work

Click the image to see the animation of how Force-guided relays work

Safety relays for ESD-Emergency Shut-Down Systems should have:

1) Force guided relay enables a feedback path just in case of welded contacts eliminate the need for and simplifies Proof Testing. (ESD-Emergency Shut Down and F&G-Fire & Gas systems)

Emergency Shut Down System Circuit

Emergency Shut Down System Circuit

Safety relays for F&G-Fire & Gas Systems should have:

The diagram below shows connection details for a safety relay used by Fire & Gas Systems. The Fire & Gas System is always on standby mode and it becomes more important to have multiple diagnostics to make sure the Fire and Gas System Safety Relay is still functional and all wirings are connected.

Fire & Gas System

Fire & Gas System

  1. Diagnostics for lost power input to field devices: Beacons, Solenoid Valves, Fire Alarm Bell.
  2. Field devices disconnection diagnostics.
  3. Short circuit field device diagnostics.
  4. Diagnostics for any welded contacts.
  5. Proof Test points (TP1, TP2, TP3) without the use of external power.
  6. All diagnostics via the same cable (A1,A2) by the use of test pulse filtering.
  7. Option for redundant connection (A1’, A2’).

If you have sales enquires to know more about this product, please feel free to send me an enquiry and a sales visit can be arranged to discuss in more detail.

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Coupling relays for safety-related activation

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In recent years, safety-related activation has become increasingly important in the field of process technology.

As a result, with PSR-PC50, Phoenix Contact offers a coupling relay that has been specially developed for this area and that can be used according to SIL 3.

4737

The coupling relay was specially designed for failsafe controllers in the field of process technology. As such, all requirements for use in applications up to SIL 3 are fulfilled, according to IEC 61508. Internally, the device has six contacts that are switched in parallel as well as in series. In this way, the safety required is taken into account, as well as the necessary availability.

Continuous diagnosis poses a challenge for planners and planning engineers. Generally speaking, the controller diagnosis ends at the coupling module used. Often this is not sufficient for many users. To this end, the line/load monitoring function of the PSR-PC50 relay enables seamless diagnostics from the controller to the actuator. Open circuits as well as short circuits in the on-load voltage supply and diagnostic supply voltage are monitored. If an error occurs during normal operation, in all established safety systems it can be reported via the existing control line back to the corresponding digital output. In this way, the need for additional installation time and other digital inputs required for actuator readback is eliminated.

 

Introducing 2 New Products of Phoenix Contact

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Powerful New Safety Relays are Just 6mm Wide

The new PSR Mini relays from Phoenix Contact are the world’s slimmest safety relays with the power of a large safety relay. With their compact 6-mm width, they ensure high safety thanks to positively driven contacts.

Phoenix Contact’s new relay technology makes this compact design possible. The design is based on a slim but powerful basic relay characterized by minimal space requirements, low energy consumption, and high system availability.

The safety relays switch loads up to 6 amperes, are compatible with many signal transducers, and can be used in many different applications thanks to extensive approvals. This makes the new products especially suitable for mechanical engineering and process industry applications.

4706

For users, these slim modules require up to 70 percent less space. Since only a single enabling contact is needed, applications can be built with new and improved cost-effectiveness. Safety relays can even be used to build distributed systems in potentially explosive areas. The terminal carriers also enable the use of system cabling solutions for a fast and correct start-up and field connection.

The complete PSR Mini range of safety relays consists of 6-mm and 12-mm models.

 

New EH Housing from Phoenix Contact

Introducing the latest addition to housing family, EH housing – the universal housing system with modular concept which is tailored for your electronic application needs.

EH housing offers you simple design-in, thanks to its variable housing form factor – high and flat design!

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Let us look into details of this marvelous housing family. For a functional device concept, PCBs can be installed in all three space direction. Free choices of PCB connection technologies are available from Phoenix Contact. We have them all incorporated seamlessly into our latest EH housing. From conventional terminal blocks, plug and headers, to RJ 45, or even USB ports, to cover your wide range of today’s electronic application!

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Do you want to house your PCB?

Do you want to save more to maximize your profit for your product?

Do you want your PCB to be covered within Phoenix Contact superb quality and reliable housing?

Talk to us now! We are always available for you!