Tuesday, May 28, 2019

Achieve SIL 3 without external redundancy

New TÜV-certified QUINT 20+ power supply for applications up to SIL 3

Phoenix Contact’s premium QUINT POWER line now includes a single-device solution that meets functional safety applications up to Safety Integrity Level (SIL) 3. The new QUINT 20+ power supply has an integrated decoupling MOSFET and double overvoltage protection circuitry to meet rigorous SIL 3 safety regulations without the need for external redundancy.

The QUINT 20+ power supply introduces a single conformally coated device solution with ATEX, IECEx and Class I, Division 2 approvals, which allows the power supply to be mounted within potentially explosive areas (Zone 2). The functional safety approval allows the QUINT 20+ power supply to be used in applications up to SIL 3, according to IEC 61508. The safety function is to limit the output voltage to 30 V DC, and if higher, to switch off within 20 milliseconds. The safe state is no output voltage. Designed with double overvoltage circuitry, the QUINT 20+ power supply also has a Hardware Fault Tolerance (HFT) of 1.

What is SIL and why is SIL important?

Safety Integrity Level (SIL) is a measure of safety system performance in terms of the probability of failure on demand.  As the SIL increases, the safety level of the product increases, meaning the probability that the system will fail to perform properly decreases. Often used in the processing industry, SIL provides intricate safety regulations to ensure the avoidance of catastrophic accidents and errors that can be detrimental to the most stringent operations.

Phoenix Contact’s QUINT4-PS/1AC/24DC/20/+ (2904617) power supply has been certified for functional safety applications in accordance to IEC 60950-1 and IEC 61010-1 and multiple EMC standards including EN61000-6-7. The power supply guarantees superior system availability with an integrated decoupling MOSFET and an overvoltage protection circuitry with SIL 3, HFT = 1 certification in accordance with IEC 61508. With a protective conformal coating and ATEX/IECEx approval in accordance with the standards IEC 60079-0, IEC 60079-7, IEC 60079-11, and IEC 60079-15, the QUINT Plus power supply can also be mounted within potentially explosive areas (zone 2).

The OVP circuitry built in the QUINT4-PS/1AC/24DC/20/+ (2904617) can be used to set up single or redundant bulk power systems with proven OVP. The power supply can be used in applications up to SIL 3, according to IEC 61508 and IEC 61511. The safety function is to limit the output voltage to 30 V DC. If the voltage rises above 30 V DC, the device will switch off within 20ms, creating a safe state of no output voltage.

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