SF2

SF POLARISED, MONOSTABLE SAFETY RELAY with (mechanical linked) forced contacts operation π 53.3±0.3 2.098±.012 25.0 .984 16.5±0.3 .650±.012 (SF3 pending) (SF3 pending) (SF3 pending) SF-RELAYS enables to plan a circuit to detect welding or go back to the beginning condition. • Separated chamber structure (2 Form A 2 Form B, 3 Form A 1 Form B, 4 Form A 4 Form B) N.O. and N.C. side contacts are put in each own space surrounded with a card and a body-separater. That prevents short circuit between contacts, which is caused by their springs welding or damaged. • UL/CSA, TÜV, SEV approved (UL/CSA, SEV of SF3 pending) FEATURES • Forced operation contacts (2 Form A 2 Form B, 3 Form A 1 Form B) N.O. and N.C. side contacts are connected through a card so that one interacts with the other in movement. In case of a contact welding, the other keeps a min. 0.5mm .020inch contact gap. • Independent operation contacts (4 Form A 4 Form B) Each pair of contacts is free from the main armature and is independent from each other. So if a N.O. pair of contacts are welded, the other 3 N.O. contacts are not effected (operate properly) That 53.3±0.3 2.098±.012 25.0 .984 16.5±0.3 .650±.012 53.3±0.3 2.098±.012 33±0.3 1.299±.012 16.5±0.3 .650±.012 mm inch SPECIFICATIONS Contact Type Arrangement Initial contact resistance, max. (By voltage drop 6 V DC 1 A) Contact material Nominal switching capacity Rating Max. switching power (resistive) Max. switching voltage Max. carrying current Mechanical (at 180 Expected cpm) (resistive) life (min. operations) Electrical (at 20 cpm) SF2 SF3 SF4 2 Form A 3 Form A 4 Form A 2 Form B 1 Form B 4 Form B 30 mΩ Gold-flashed silver alloy 6 A 250 V AC, 6 A 30 V DC 1,500 VA, 180 W 30 V DC, 440 V AC 6 A DC, AC 107 3×104*1 105 Characteristics (at 25°C 77°F, 50% Relative humidity) Max. operating speed Initial insulation resistance*2 Between contact sets Initial breakBetween open down voltage*3 contacts Between contact and coil Operate time*4 (at nominal voltage) Release time (without diode)*4 (at nominal voltage) Temperature rise (at nominal voltage) Functional*5 Shock resistance Destructive*5 Vibration resistance Conditions for operation, transport and storage*8 (Not freezing and condensing at low temperature) SF2 SF3 SF4 180 cpm (at nominal voltage) Min. 1,000 MΩ at 500 V DC 2,500 Vrms 2,500 Vrms 2,500 Vrms Approx. 17 ms Approx. 7 ms Approx. 18 ms Approx. 6 ms Coil (at 25°C 77°F) Nominal operating power Remarks * Specifications will vary with foreign standards certification ratings. *1 500 mW Functional*7 Destructive Ambient temp. Humidity More than 105 operations when applying the nominal switching capacity to one side of contact pairs of each Form A contact and Form B contact *2 Measurement at same location as " Initial breakdown voltage " section *3 Detection current: 10mA *4 Excluding contact bounce time *5 Half-wave pulse of sine wave: 11ms; detection time: 10µs *6 Half-wave pulse of sine wave: 6ms *7 Detection time: 10µs *8 Refer to 5. Conditions for operation, transport and storage mentioned in AMBIENT ENVIRONMENT (Page 61). Max. 45°C with nominal coil voltage and at 6 A switching current Min. 294 m/s2 {30 G} Min. 980 m/s2 {100 G} 117.6 m/s2 {12 G}, 10 to 55 Hz at double amplitude of 2 mm 117.6 m/s2 {12 G}, 10 to 55 Hz at double amplitude of 2 mm –40°C to +70°C –40°F to +158°F 5 to 85% R.H. 37 g 1.31 oz 47 g 1.66 oz Unit weight ORDERING INFORMATION Ex. SF 2 DC 12 V Coil voltage DC 5, 9, 12, 18, 21, 24, 36, 48, 60 V Contact arrangement 2: 2 Form A 2 Form B 3: 3 Form A 1 Form B 4: 4 Form A 4 Form B TYPICAL APPLICATIONS • Signal • Escalator • Elevator • Medical Instruments • Railway • Factory Automation UL/CSA, TÜV, SEV approved type is standard (SF2, SF4) TÜV approved type is standard (SF3) 258 SF TYPES AND COIL DATA (at 20°C 68°F) Contact arrangement Part No. SF2-DC5V SF2-DC9V SF2-DC12V SF2-DC18V SF2-DC21V SF2-DC24V SF2-DC36V SF2-DC48V SF2-DC60V SF3-DC5V SF3-DC9V SF3-DC12V SF3-DC18V SF3-DC21V SF3-DC24V SF3-DC36V SF3-DC48V SF3-DC60V SF4-DC5V SF4-DC9V SF4-DC12V SF4-DC18V SF4-DC21V SF4-DC24V SF4-DC36V SF4-DC48V SF4-DC60V Nominal voltage, V DC 5 9 12 18 21 24 36 48 60 5 9 12 18 21 24 36 48 60 5 9 12 18 21 24 36 48 60 Pick-up voltage, VDC (max.) 3.75 6.75 9 13.5 15.75 14.4 27 36 45 3.75 6.75 9 13.5 15.75 14.4 27 36 45 3.75 6.75 9 13.5 15.75 14.4 27 36 45 Drop-out voltage, V DC (min.) 0.5 0.9 1.2 1.8 2.1 2.4 3.6 4.8 6.0 0.5 0.9 1.2 1.8 2.1 2.4 3.6 4.8 6.0 0.75 0.9 1.8 1.8 2.1 3.6 3.6 7.2 9.0 Coil resistance Ω (±10%) 50 288 Nominal operating current, mA(±10%) 100 41.7 Nominal operating power, mW 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 Max. allowable voltage, V DC 6 10.8 14.4 21.6 25.2 28.8 43.2 57.6 72 6 10.8 14.4 21.6 25.2 28.8 43.2 57.6 72 6 10.8 14.4 21.6 25.2 28.8 43.2 57.6 72 SF2 1.152 4.608 7.200 50 288 20.8 10.4 8.3 100 41.7 SF3 1.152 4.608 7.200 50 288 20.8 10.4 8.3 100 41.7 SF4 1.152 4.608 7.200 20.8 10.4 8.3 DIMENSIONS 1) SF2 16±0.3 .630±.012 2 mm inch Schematic (Bottom view) 5 1 6 7 8 0.5 .020 5.08 .200 12.7 .500 12.7 .500 53.3±0.3 2.098±.012 6 7 8 9 10 11 12 12.7 .500 3.5±0.3 .138±.012 PC board pattern (Bottom view) 2.54 .100 10-1.4 DIA. HOLES 10-.055 DIA. HOLES 5 25.0 .984 7.62 .300 2.54 .100 12.7 .500 1 2 9 10 11 12 General tolerance: ±0.3 ±.012 Tolerance: ±0.1 ± .004 259 SF 2) SF3 Schematic (Bottom view) 5 1 16±0.3 .630±.012 2 0.5 .020 5.08 .200 12.7 .500 12.7 .500 53.3±0.3 2.098±.012 6 7 8 mm inch 6 7 8 9 10 11 12 12.7 .500 3.5±0.3 .138±.012 PC board pattern (Bottom view) 2.54 .100 10-1.4 DIA. HOLES 10-.055 DIA. HOLES 5 25.0 .984 7.62 .300 2.54 .100 12.7 .500 1 2 9 10 11 12 General tolerance: ±0.3 ±.012 Tolerance: ±0.1 ±.004 3) SF4 Schematic (Bottom view) 13 16±0.3 .630±.012 0.3 .012 5.08 .200 12.7 .500 12.7 .500 53.3±0.3 2.098±.012 14 6 15 7 16 8 14 15 16 1 5 9 2 17 18 19 20 6 10 7 11 8 12 12.7 .500 3.5±0.3 .138±.012 33±0.3 1.299±.012 7.62 .300 13 5 1 7.62 .300 12.7 .500 PC board pattern (Bottom view) 2.54 .100 2.54 .100 18-1.4 DIA. HOLES 18-.055 DIA. HOLES 2 9 17 10 18 11 19 12 20 7.62 .300 General tolerance: ±0.3 ±.012 Tolerance: ±0.1 ±.004 REFERENCE DATA 1. Operate/release time 2. Coil temperature rise Coil applied voltage: 120%V Contact switching current: 6A 50 Operate/release time, ms 60 50 40 -40 -20 30 20 Contact 10 Max. x Min. 90 100 110 120 Coil applied voltage, %V Release time 0 -100 -50 Inside the coil 0 20 40 3. Ambient temperature characteristics Tested sample: SF4-DC12V Quantity: n = 6 Rate of change, % 100 Drop-out voltage 50 Pick-up voltage 60 80 Ambient temperature, °C 40 30 Operate time 20 Max. x Min. 10 0 Temperature rise, °C 80 30 50 70 Ambient temperature, °C 260 SF 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 Structure Min. 0.5 mm .020 inch 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. Operation Contact a Card 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 contact "a" maintain at a gap of greater than 0.5 mm .020 inch. Subsequent contact movement is suspended and the weld can be detected 1. Forced operation method (2a2b, 3a1b, 4a4b types) Weld Contact b 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. External NO contact weld Return Enables design of safety circuits that allow weld detection and return at an early stage. 2. Independent operation method (4a4b type) Return Return 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. 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. In independent chambers, the contacts "a" and "b" are kept apart by a body/card separator or by the card itself. Case separator 1 Card Contact a 2 Body separator Contact b 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. 3. Separate chamber method (2a2b, 3a1b, 4a4b types) 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. 261 SF THE OPERATION OF SF RELAYS (when contacts are welded) SF relays work to maintain a normal operating state even when overloading or short-circuit currents occur. It is also easy to include weld detection circuits and safety circuits in the design to ensure safety even if contacts weld. 1) 2a2b Type Form “b” Contact Weld If the form “b” contacts (Nos. 1 and 3) weld, the armature becomes non-operational and the contact gap of the two form “a” contacts is maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured. No.4 No.1 No.4 No.1 If the No. 1 contact welds. A gap of greater than 0.5 mm .020 inch is maintained at each of the two form "a" contacts (Nos. 2 and 4). No.3 No.2 No.3 No.2 Non-energized Energized (when no. 1 contact is welded) Form “a” Contact Weld If the two form “a” contacts (Nos. 2 and 4) weld, the armature becomes non-operational and the gap between the two form "b" contacts is maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured. No.4 No.1 No.4 No.1 If the No. 2 contact welds. Each of the two form "b" contacts (Nos. 1 and 3) maintains a gap of greater than 0.5 mm .020 inch. No.3 No.2 No.3 No.2 Energized Non-energized (when no. 2 contact is welded) Contact Operation Table The table below shows the state of the other contacts when the current through the welded form “a” contact is 0 V and the rated voltage is applied through the form “b” contact. Contact No. Contact No. 1 Welded 2 terminal 3 No. 4 No.4 No.1 No.3 No.2 State of other contacts 1 2 3 4 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5: contact gap is kept at min. 0.5 mm .020 inch Empty cells: either closed or open Contact No. Terminal No. No.1 11–12 No.2 7–8 No.3 5–6 No.4 9–10 Note: Contact gaps are shown at the initial state. If the contacts change state owing to loading/breaking it is necessary to check the actual loading. 262 SF 2) 3a1b Type Form “b” Contact Weld If the form “b” contact (No. 3) welds, the armature becomes non-operational, the contact gaps at the three form “a” contacts are maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured No.4 No.1 No.4 No.1 If the No. 3 contact welds. Each of the two form “a” contacts (Nos. 1, 2, and 4) maintain a gap of greater than 0.5 mm .020 inch. No.3 No.2 No.3 No.2 Non-energized Energized (when no. 3 contact is welded) Form “a” Contact Weld When the form “a” contacts (nos. 1, 2, and 4) weld, the armature remains in a non-returned state and the contact gap at the single form “b” contact is maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured. No.4 No.1 No.4 No.1 If the No. 2 contact welds. The single form “b” contact (No. 3) maintains a gap of greater than 0.5 mm .020 inch. No.3 No.2 No.3 No.2 Energized Non-energized (when no. 2 contact is welded) Contact Operation Table The table below shows the state of the other contacts when the current through the welded form “a” contact is 0 V and the rated voltage is applied through the form “b” contact. No.4 No.1 No.3 No.2 Contact No. Contact No. 1 Welded 2 terminal 3 No. 4 State of other contacts 1 2 3 4 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5: contact gap is kept at min. 0.5 mm .020 inch Empty cells: either closed or open Contact No. Terminal No. No.1 11–12 No.2 7–8 No.3 5–6 No.4 9–10 Note: Contact gaps are shown at the initial state. If the contacts change state owing to loading/breaking it is necessary to check the actual loading. 263 SF 3) 4a4b Type Internal Contacts Weld If the internal contacts (nos. 2, 3, 6, and 7) weld, 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. No.8 No.7 No.1 No.2 No.8 No.7 No.1 No.2 No.6 No.5 No.3 No.4 No.6 No.5 No.3 No.4 If the No. 2 contact welds. Each of the four form "a" contacts (Nos. 1, 3, 5, and 7) maintains a gap of greater than 0.5 mm .020 inch. Non-energized Energized (when no. 2 contact is welded) External Contacts Weld If the external contacts (nos. 1, 4, 5, and 8) weld, gaps of greater than 0.5 mm .020 inch are maintained between adjacent contacts and the coil returns to an non-energized state. No.8 No.7 No.1 No.2 No.8 No.7 No.1 No.2 No.6 No.5 No.3 No.4 No.6 No.5 No.3 No.4 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 (nos. 3, 5, and 7) maintains a contact gap of greater than 0.5 mm .020 inch; each of the form “b” contacts (nos. 4, 6, and 8) return to a closed state. Energized Non-energized (when no. 1 contact is welded) If external connections are made in series. Even if one of the contacts welds, because the other contacts operate independently, the contact gaps are maintained at greater than 0.5 mm .020 inch. Weld Energized Contact gap min 0.5 mm .020 inch Non-energized Contact Operation Table The table below shows the state of the other contacts when the current through the welded form “a” contact is 0 V and the rated voltage is applied through the form “b” contact. Contact No. 1 Contact No. 1 2 >0.5 3 Welded 4 ≠ terminal 5 >0.5 No. 6 >0.5 7 8 ≠ No.8 No.7 No.1 No.2 2 >0.5 >0.5 >0.5 ≠ >0.5 >0.5 No.6 No.5 No.3 No.4 Contact No. No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8 Terminal No. 13–14 5–6 9–10 17–18 19–20 11–12 7–8 15–16 State of other contacts 3 4 5 6 >0.5 ≠ >0.5 ≠ >0.5 >0.5 >0.5 >0.5 >0.5 ≠ >0.5 >0.5 ≠ >0.5 >0.5 >0.5 >0.5 >0.5 ≠ >0.5 ≠ >0.5 7 >0.5 >0.5 ≠ >0.5 >0.5 >0.5 8 ≠ >0.5 >0.5 ≠ >0.5 >0.5: contact gap is kept at min. 0.5 mm .020 inch ≠: contact closed Empty cells: either closed or open Note: Contact gaps are shown at the initial state. If the contacts change state owing to loading/breaking it is necessary to check the actual loading. For Cautions for Use, see Relay Technical Information (Page 48 to 76). 264 9/1/2000 All Rights Reserved, © Copyright Matsushita Electric Works, Ltd. Go To Online Catalog