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SD2D-DC5V Datenblatt(PDF) 4 Page - Nais(Matsushita Electric Works) |
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SD2D-DC5V Datenblatt(HTML) 4 Page - Nais(Matsushita Electric Works) |
4 / 5 page 7 THE OPERATION OF SF RELAYS (when contacts are welded) SF relays work to maintain a normal operating state even when the contact welding occur by overloading or short-circuit currents. It is easy to make weld detection circuits and safety circuits in the design to ensure safety even if contacts weld. If the internal contacts (No. 2, 3, 6, and 7) weld of 4a4b type, the armature becomes non-operational and the contact gaps of each of the four form “a” contacts are maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured. The 2a2b type operates in the same way. Internal Contacts Weld If the No. 2 contact welds. Each of the four form “a” contacts (No. 1, 3, 5, and 7) maintains a gap of greater than 0.5 mm .020 inch. No.1 No.2 No.3 No.4 No.8 No.7 No.6 No.5 Non-energized No.1 No.2 No.3 No.4 No.8 No.7 No.6 No.5 Energized (when no. 2 contact is welded) If the external contacts (No. 1, 4, 5, and 8) weld of 4a4b type, gaps of greater than 0.5 mm .020 inch are maintained between adjacent contacts and the other contacts return by an non-energized. External Contacts Weld If the No. 1 contact welds. The adjacent No. 2 contact maintains a gap of greater than 0.5 mm .020 inch. The other contacts, because the coil is not energized, return to their normal return state; each of form “a” contacts (No. 3, 5, and 7) maintains a contact gap of greater than 0.5 mm .020 inch; each of the form “b” contacts (No. 4, 6, and 8) return to a closed state. If external connections are made in series. Even if one of the contacts welds, the other contacts operate independently and the contact gaps are maintained at greater than 0.5 mm .020 inch. No.1 No.2 No.3 No.4 No.8 No.7 No.6 No.5 Energized No.1 No.2 No.3 No.4 No.8 No.7 No.6 No.5 Non-energized (when no. 1 contact is welded) Energized Contact gap min 0.5 mm .020 inch Weld Non-energized The table below shows the state of the other contacts. In case of form “a” contact weld the coil applied voltage is 0 V. In case of form “b” contact weld the coil applied voltage is nominal. Contact Operation Table No.1 No.2 No.3 No.4 No.8 No.7 No.6 No.5 Contact No. No.1 No.2 No.3 No.4 Terminal No. 20–19 12–11 8–716–15 No.5 No.6 No.7 No.8 13–14 5–69–10 17–18 Note: Contact gaps are shown at the initial state. If the contact transfer is caused by load switching, it is necessary to check the actual loading. Contact No. State of other contacts >0.5: contact gap is kept at min. 0.5 mm .020 inch ≠: contact closed Empty cells: either closed or open Contact No. 1 2 3 4 5 6 7 8 Welded contact No. 1 >0.5 >0.5 ≠ >0.5 ≠ >0.5 ≠ 2 >0.5 >0.5 >0.5 >0.5 3 >0.5 >0.5 >0.5 >0.5 4 ≠ >0.5 >0.5 ≠ >0.5 ≠ >0.5 5 >0.5 ≠ >0.5 ≠ >0.5 >0.5 ≠ 6 >0.5 >0.5 >0.5 >0.5 7 >0.5 >0.5 >0.5 >0.5 8 ≠ >0.5 ≠ >0.5 ≠ >0.5 >0.5 |
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