What is line monitoring relay?
Solid-state line monitoring relays provide maximum protection for mobile machines and plants or for unstable networks. Depending on the version, the relays monitor phase sequence, phase failure with and without N conductor monitoring, phase unbalance, undervoltage or overvoltage.
What is SIL relay?
A SIL (Safety Integrity Level) certified relay (Safety Relay) has a known and guaranteed ability to perform a given Safety Function and reach a specific safe state on demand (i.e. open a relief valve or activate a Fire Extinguishing System).
What is a monitoring safety relay?
Safety Relays check and monitor a safety system and either allow the machine to start or execute commands to stop the machine. Single-function safety relays are the most economical solution for smaller machines where a dedicated logic device is needed to complete the safety function.
What is a safe coupling relay?
In the process industry safe coupling relays are often used for coupling safety related signals, for example output signals of a safe control system to the periphery. Redundantly built, self-monitoring coupling relays allow the standardized coupling of safety related signals up to SIL 3 / PL e. …
How does line monitoring work?
It works by introducing a DC voltage across the circuit via an internal pull-up resistor. If the terminating resistor is disconnected or a short circuit develops across the line then the monitoring circuit will detect a change in the measured voltage.
How does a monitoring relay work?
To determine if a phase imbalance is present, the relay monitors each of the phases to detect when the voltage in any one phase falls by a predetermined amount below the average of all three phases. Similarly, if complete loss of a phase is detected, the relay will trip and disconnect power from the motor.
What is SIL standard?
Safety integrity level (SIL) is defined as a relative levels of risk-reduction provided by a safety function, or to specify a target level of risk reduction. In the functional safety standards based on the IEC 61508 standard, four SILs are defined, with SIL 4 the most dependable and SIL 1 the least.
What is a Category 3 safety circuit?
At a very high level, Category 3 refers to a design principle used by the engineering teams. It means that the machines are designed to not only check for faults but also have redundant circuits for all safety functions. In other words, safety functions are again at risk in between scans for failure.
What is dual channel safety relay?
The Dual-Channel Emergency Stop Safety Relay monitors emergency stop devices, such as palm buttons and rope/cable pulls, and positive-opening safety switches used for guard/gate interlocking. It is designed to connect safety devices, such as interlock switches, to the machine control unit.
What is force guided relay?
Force guided relays are electromechanical switching devices that provide a safe monitoring of contacts within circuits. Force guided relays are used in safety circuits in combination with light curtains, interlock switches, and emergency stop switches to control outputs.
Why is line monitoring needed?
Why do Circuits Need Line Monitoring? This is because fire sensors are “Normally Open” devices; they only close the circuit when they trip. Therefore, a fire zone in its normal state would appear the same to the F&G system as one where the wire has been cut: namely, open.
What are the applications for the SIL 3-rated relay?
Applications for the SIL 3-rated relay include: Use as an interposing relay on 24-V outputs from SIL-rated PLCs, SIL-rated DCSs or other SIL-rated controllers Emergency stop or safety door.
What does SIL stand for?
The SAFESERIES offers you a safety switch-off for the feed-in of fuel to furnace firing systems up to safety integrity level (SIL) 3. SAFESERIES SIL relays – Overview D Safety relay D.21427050000 – 2013/2014 Buy: www.ValinOnline.com | Phone 844-385-3099 | Email: [email protected] Safe use in corrosive environments
Why choose weidmuller SIL Safety relays?
Weidmuller SAFESERIES SIL Safety Relays When dealing with the core elements of a system with a large risk potential, it is especially critical to have the best system solution in place. Our SIL relays reliably switch off your systems in critical situations – and they have all been accredited. Let’s connect.
What are the new safety relays based on?
The new safety relays are based on a 1oo3 architecture (one-out-of-three) with triple redundant contacts. This ensures reliable switching on or off—even with two faulty contacts. Rely on high availability of the safety functions in your plant!