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SF2-DC9V Datasheet(PDF) 4 Page - Nais(Matsushita Electric Works) |
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SF2-DC9V Datasheet(HTML) 4 Page - Nais(Matsushita Electric Works) |
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4 / 7 page  261 SF Structure Operation 1. Forced operation method (2a2b, 3a1b, 4a4b types) The two contacts “a” and “b” are coupled with the same card. The operation of each contact is regulated by the movement of the other contact. Even when one contact is welded closed, the other maintains a gap of greater than 0.5 mm .020 inch. In the diagram on the left, the lower contact "b" have welded but the upper con- tact "a" maintain at a gap of greater than 0.5 mm .020 inch. Subsequent contact movement is suspended and the weld can be detected 2. Independent operation method (4a4b type) None of four contacts are held in position by the armature. Even though one of the external N.O. contacts has welded, the other three contacts have returned owing to the de-energizing of the coil. Enables design of safety circuits that allow weld detection and return at an early stage. As shown at the top right of the diagram on the left, if the external N.O. contact welds, a 0.5 mm .020 inch gap is maintained. Each of the other contacts returns to N.O. because the coil is no longer energized. 3. Separate chamber method (2a2b, 3a1b, 4a4b types) In independent chambers, the contacts "a" and "b" are kept apart by a body/card separator or by the card itself. Prevents shorting and fusing of springs and spring failure owing to short-circuit current. As shown on the diagram on the left, even if the operating springs numbered 1 and 2 there is no shorting between "a" and "b" contacts. 4. High-efficiency 4-gap balanced armature structure (2a2b, 3a1b, 4a4b types) The use of high-efficiency magnetically polarized circuits and 4-gap balanced armature structure means that springs are not required. Does away with return faults due to fatigue or breakage of the return spring, especially stoppage during contact states. 5. 2a2b contact 3a1b contact 4a4b contact Structure with independent COM contact of (2a2b), (3a1b), (4a4b) contacts. Independent COM enables differing pole circuit configurations. This makes it possible to design various kinds of control circuits and safety circuits. Min. 0.5 mm .020 inch Contact a Card Weld Contact b Return Return External NO contact weld Return Case separator Card Contact a Body separator Contact b 1 2 SAFETY STRUCTURE OF SF RELAYS This SF relay design ensures that subsequent operations shut down and can automatically return to a safe state when the SF relay suffers overloading and other circuit abnormalities (unforeseen externally caused circuit or device breakdowns, end of life incidents, and noise, surge, and environmental influences) owing to contact welding, spring fusion or, in the worst-case scenario, relay breakdown (coil rupture, faulty operation, faulty return, and fatigue and breakage of the operating spring and return spring), and even in the event of end of life. |
Similar Part No. - SF2-DC9V |
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Similar Description - SF2-DC9V |
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