SMC - meeting tomorrow’s machine safety standards today Machinery Directive 2006/42/EC Safety control system standard EN ISO 13849-1 Dual residual pressure release valve with position detection sensor Series VP542-X536 / VP742-X536 Series VP544-X538 / VP744-X538 Series VG342-X87
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Safety Standard ISO13849-1 Under EN ISO 13849-1, the consideration of safety starts with the risks associated with the machine, its function and its operation. Machine designers are obliged to eliminate risks before considering further measures to reduce or control risks (EN ISO 12100). The risks of the machine must be quantified by the machine designer and if the risks are considered high, the designer is obliged to employ systems that reduce the risks to acceptable levels.
Following the standard Determination of Required Performance Level PLr There are five performance levels: a, b, c, d, e, with “a” being low risk and “e” representing the highest risk. Each of these five performance levels corresponds to a further parameter scale, based on the probability of a dangerous failure per hour.
Architecture categories – B and 1 In categories B and 1, the resistance to faults is achieved primarily by the selection and use of suitable components. Category 1 has a greater resistance than category B because of the use of basic and well-tried principles, as well as well-tried components, wich are tested in a safety context.
Reliability of a safety system The reliability of a system has to be quantified as part of the Performance level (PL). Reliability is expressed as the Mean Time to Dangerous Failure (MTTFd ) which is measured in hours. The MTTFd should be determined from the component manufacturer’s data. However, as this is application-specific, the components MTTFd cannot be quoted in isolation as the manufacturer is not aware of the exact machine application.
Diagnostic coverage categories: Category None Low Medium High Range DC < 60% 60% ≤ DC < 90% 90% ≤ DC < 99% 99% ≤ DC Diagnostic coverage estimates (for output devices such as SMC valves with position detection): Measure Diagnostic coverage Monitoring of outputs by one channel without dynamic test. 0% to 99% depending on how often a signal change is done by the application. Cross monitoring of outputs without dynamic test. 0% to 99% depending on how often a signal change is done by the application.
After these four essential quantitative parameters have been determined, EN ISO 13849-1 proposes a simple graphical method for determining the achieved PL for the SRP/CS.
SMC Role and Support SMC supports equipment manufacturers and end users considering safety design of equipment and machines, helping with equipment selection, providing products related to the safety control system, and also data about the life of equipment.
SMC Safety System Valves Series VP542-X536 / VP742-X536 Residual pressure release valve - 3 port solenoid valve Features • Safety Standards ISO13849-1 for Category 2 This product is designed to be used as a component in a Category 2 safety system. The single unit alone cannot be considered as a Category 2 safety system.
Fluid VP542(R)-X536 Model VP742(R)-X536 1 2 (P A) 2 3 (A R) 1 2 (P A) 2 3 (A R) C [dm /(s·bar)] 8.9 8.9 15.1 15.3 b 0.16 0.20 0.21 0.22 Cv 2.2 2.1 3.6 3.7 2085 2132 2637 3707 Operating pressure 3 Q [L/min] (ANR) note) Note) These valves have been calculated according to ISO 6358 and indicate the flow rate under Standard conditions with an inlet pressure of 0.6 MPa (relative pressure) and a pressure drop of 0.1 MPa.
Series VP544-X538 / VP744-X538 Dual residual pressure release valve - 3 port solenoid valve Features • Safety Standards ISO13849-1 for Category 3 and 4 This product is designed to be used as a component in a Category 3,4 safety system. The single unit alone cannot be considered as a Category 3,4 safety system.
Fluid Model VP544(R)-X538 VP744(R)-X538 1 2 (P A) 2 3 (A R) 1 2 (P A) C [dm3/(s·bar)] 6.5 6.7 10.3 9.7 b 0.08 0.10 0.08 0.08 Operating pressure Cv Q [L/min] (ANR) note) 2 3 (A R) 1.3 1.3 2.3 2.1 1461 1621 2315 2180 Note) These valves have been calculated according to ISO 6358 and indicate the flow rate under Standard conditions with an inlet pressure of 0.6 MPa (relative pressure) and a pressure drop of 0.1 MPa.
Series VG342-X87 Dual residual pressure release valve - 3 port solenoid valve Features • Safety Standard ISO13849-1 for Category 3 and 4, compliant with performance level e This product is designed to be used as a component in a Category 3,4 safety system. The single unit alone e cannot be considered as a Category 3,4 safety system.
Fluid 1 2 (P A) [l/min (ANR)] 2 3 (A R) [l/min (ANR)] 0.25 MPa 3800 5200 0.5 MPa 7400 9400 0.7 MPa 10000 13000 Operating pressure Solenoid Specifications Limit switch Specifications Electrical entry DIN terminal Rated voltage 24 VDC Light/surge voltage Suppressor 5 VDC, 1 mA (load resistance) Minimum applicable load 2.
SMC Related Product Safety components Apart from VP첸42-X536, VP첸44-X538, and VG342-X87 series, SMC has other safety components products. Two hand control valve Series VR51 • To initiate machine operation while ensuring operator hands are in safe area. • Certified type IIIA according to EN574.
Pressure switch / reed switch type Series IS10 • Turns on when the pressure exceeds the set pressure range. Reed auto-switch Series D-A93 Solid state auto-switch Series D-M9 Solid state auto-switch, water resistant Series D-M9A • Detects the position of actuators. Soft start-up valve Series EAV • Integrated pressure release function & high relief capacity: possible to cut off supply for rapid exhaust. • Adjustable bleed orifice. • Pressure gauge can be fitted. • Low power consumption.
Speed control valve Series ASS • Meter out type: a control valve with cylinder speed control, fixed throttle and rapid air supply function. • Meter in type: a control valve with cylinder speed control function and rapid air supply function. Dual speed controller Series ASD • Flow control is possible in two directions. Speed controller Series AS첸첸첸1F • Residual pressure can be instantly released by pressing a button on the product. • Prevents unintended manual operation.
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