SF2 NAIS | Alldatasheet

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POLARISED, MONOSTABLE SAFETY RELAY with (mechanical linked) forced contacts operation SF-RELAYS (SF3 pending) (SF3 pending) (SF3 pending) p

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 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) 25.0 .984 16.5–0.3 .650–.012 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 53.3–0.3 2.098–.012 mm inch SPECIFICATIONS

ORDERING INFORMATION

Ex. SF 2 DC 12 V Contact arrangement Coil voltage DC 5, 9, 12, 18, 21, 24, 36, 48, 60 V 2: 2 Form A 2 Form B 3: 3 Form A 1 Form B 4: 4 Form A 4 Form B UL/CSA, TÜV, SEV approved type is standard (SF2, SF4) TÜV approved type is standard (SF3) TYPICAL APPLICATIONS

  • Signal
  • Escalator
  • Elevator
  • Medical Instruments
  • Railway
  • Factory Automation Remarks * Specifications will vary with foreign standards certification ratings. More than 10 operations when applying the nominal switching capacity to one side of contact pairs of each Form A contact and Form B contact Measurement at same location as " Initial breakdown voltage " section Detection current: 10mA Excluding contact bounce time Half-wave pulse of sine wave: 11ms; detection time: 10 m s Half-wave pulse of sine wave: 6ms Detection time: 10 m s Refer to 5. Conditions for operation, transport and storage mentioned in AMBIENT ENVIRONMENT (Page 61). Contact Type SF2 SF3 SF4 Arrangement 2 Form A

2 Form B

3 Form A

1 Form B

4 Form A

4 Form B

Initial contact resistance, max. (By voltage drop 6 V DC 1 A) 30 m W Contact material Gold-flashed silver alloy Rating (resistive) Nominal switching capacity 6 A 250 V AC, 6 A 30 V DC Max. switching power 1,500 VA, 180 W Max. switching voltage 30 V DC, 440 V AC Max. carrying current 6 A DC, AC Expected life (min. operations) Mechanical (at 180 cpm) (resistive) 10 Electrical (at 20 cpm) 3 Coil (at 25°C 77°F) Nominal operating power 500 mW Characteristics (at 25°C 77°F, 50% Relative humidity) SF2 SF3 SF4 Max. operating speed 180 cpm (at nominal voltage) Initial insulation resistance* Min. 1,000 M W at 500 V DC Initial break- down voltage* Between con- tact sets 2,500 Vrms Between open contacts 2,500 Vrms Between con- tact and coil 2,500 Vrms Operate time* (at nominal voltage) Approx. 17 ms Approx. 18 ms Release time (without diode)* (at nominal voltage) Approx. 7 ms Approx. 6 ms Temperature rise (at nominal voltage) Max. 45 C with nominal coil voltage and at 6 A switching current Shock resistance Functional* Min. 294 m/s {30 G} Destructive* Min. 980 m/s {100 G} Vibration resistance Functional* 117.6 m/s {12 G}, 10 to 55 Hz at double amplitude of 2 mm Destructive 117.6 m/s {12 G}, 10 to 55 Hz at double amplitude of 2 mm Conditions for oper- ation, transport and storage* (Not freezing and condensing at low temperature) Ambient temp. –40 C to +70 C –40°F to +158°F Humidity 5 to 85% R.H. Unit weight 37 g 1.31 oz 47 g 1.66 oz

TYPES AND COIL DATA (at 20°C 68°F) Contact arrangement Part No. Nominal voltage, V DC Pick-up voltage, VDC (max.) Drop-out voltage, V DC (min.) Coil resistance W 10%) Nominal operating current, mA( 10%) Nominal operating power, mW Max. allowable voltage, V DC SF2 SF2-DC5V 5 3.75 0.5 50 100 500 6 SF2-DC9V 9 6.75 0.9 500 10.8 SF2-DC12V 12 9 1.2 288 41.7 500 14.4 SF2-DC18V 18 13.5 1.8 500 21.6 SF2-DC21V 21 15.75 2.1 500 25.2 SF2-DC36V 36 27 3.6 500 43.2 SF2-DC48V 48 36 4.8 4.608 10.4 500 57.6 SF2-DC60V 60 45 6.0 7.200 8.3 500 72 SF3 SF3-DC5V 5 3.75 0.5 50 100 500 6 SF3-DC9V 9 6.75 0.9 500 10.8 SF3-DC12V 12 9 1.2 288 41.7 500 14.4 SF3-DC18V 18 13.5 1.8 500 21.6 SF3-DC21V 21 15.75 2.1 500 25.2 SF3-DC36V 36 27 3.6 500 43.2 SF3-DC48V 48 36 4.8 4.608 10.4 500 57.6 SF3-DC60V 60 45 6.0 7.200 8.3 500 72 SF4 SF4-DC5V 5 3.75 0.75 50 100 500 6 SF4-DC9V 9 6.75 0.9 500 10.8 SF4-DC12V 12 9 1.8 288 41.7 500 14.4 SF4-DC18V 18 13.5 1.8 500 21.6 SF4-DC21V 21 15.75 2.1 500 25.2 SF4-DC36V 36 27 3.6 500 43.2 SF4-DC48V 48 36 7.2 4.608 10.4 500 57.6 SF4-DC60V 60 45 9.0 7.200 8.3 500 72 DIMENSIONS 1) SF2 12.7 .500 53.3–0.3 2.098–.012 12.7 .500 12.7 .5005.08 .200 658 7 109 1211 16–0.3 .630–.012 12.7 .500 3.5–0.3 .138–.012 0.5 .020 25.0 .984 7.62 .300 678 9 1 01 11 2 2.54 .100 2.54 .100 10-1.4 DIA. HOLES 10-.055 DIA. HOLES General tolerance: –0.3 ±.012 PC board pattern (Bottom view) Tolerance: –0.1 ± .004 Schematic (Bottom view) mm inch

  1. Operate/release time 2. Coil temperature rise Coil applied voltage: 120%V Contact switching current: 6A 3. Ambient temperature characteristics Tested sample: SF4-DC12V Quantity: n = 6 30 50 70 Temperature rise, °C Ambient temperature, °C Inside the coil Contact -40 -20 0 20 40 60 80 -50 100 -100 Rate of change, % Ambient temperature, °C Pick-up voltage Drop-out voltage 3) SF4 2.54 .100 2.54 .100 18-1.4 DIA. HOLES 18-.055 DIA. HOLES General tolerance: –0.3 ±.012 PC board pattern (Bottom view) Schematic (Bottom view) Tolerance: –0.1 ±.004 12.7 .500 53.3–0.3 2.098–.012 12.7 .500 12.7 .5005.08 .200 1817 20 19 109 1413 16 15 1211 16–0.3 .630–.012 12.7 .500 7.62 .300 7.62 .300 3.5–0.3 .138–.012 0.3 .012 33–0.3 1.299–.012 7.62 .300 REFERENCE DATA 80 10090 120 110 Min. Max. Operate time Release time Min. Max. x x Operate/release time, ms Coil applied voltage, %V 2) SF3 12.7 .500 53.3–0.3 2.098–.012 12.7 .500 12.7 .5005.08 .200 658 7 109 1211 16–0.3 .630–.012 12.7 .500 3.5–0.3 .138–.012 0.5 .020 25.0 .984 7.62 .300 5678 9 1 01 11 2 2.54 .100 2.54 .100 10-1.4 DIA. HOLES 10-.055 DIA. HOLES General tolerance: –0.3 ±.012 PC board pattern (Bottom view) Schematic (Bottom view) Tolerance: –0.1 ±.004 mm inch
  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 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.

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. Form “a” Contact Weld 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.4 No.3 No.1 No.2 Energized No.4 No.3 No.1 No.2 Non-energized (when no. 2 contact is welded) No.4 No.3 No.1 No.2 Terminal No. 11–12 7–8 5–6 9–10 State of other contacts 1234 Welded terminal No. 1 >0.5 >0.5 2 >0.5 >0.5 3 >0.5 >0.5 4 >0.5 >0.5 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. >0.5: contact gap is kept at min. 0.5 mm .020 inch Empty cells: either closed or open Contact No. Contact No. 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 Operation Table 1) 2a2b Type 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. Form “b” Contact Weld If the No. 1 contact welds. A gap of greater than 0.5 mm .020 inch is main- tained at each of the two form "a" contacts (Nos. 2 and 4). No.4 No.3 No.1 No.2 Non-energized No.4 No.3 No.1 No.2 Energized (when no. 1 contact is welded) 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.

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 volt- age is applied through the form “b” contact. Contact Operation Table No.4 No.3 No.1 No.2 Terminal No. 11–12 7–8 5–6 9–10 State of other contacts 1234 Welded terminal No. 1 >0.5 2 >0.5 3 >0.5 >0.5 >0.5 4 >0.5 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. >0.5: contact gap is kept at min. 0.5 mm .020 inch Empty cells: either closed or open Contact No. Contact No. 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.4 No.3 No.1 No.2 Non-energized No.4 No.3 No.1 No.2 Energized (when no. 3 contact is welded) 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. Form “a” Contact Weld 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.4 No.3 No.1 No.2 Energized No.4 No.3 No.1 No.2 Non-energized (when no. 2 contact is welded) 2) 3a1b Type 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 Form “b” Contact Weld

No.1 No.2 No.3 No.4 No.8 No.7 No.6 No.5 Terminal No. 13–14 5–6 9–10 17–18 No.5 No.6 No.7 No.8 19–20 11–12 7–8 15–16 State of other contacts 12345678 Welded terminal No. 1 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 5 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 >0.5 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. >0.5: contact gap is kept at min. 0.5 mm .020 inch : contact closed Empty cells: either closed or open Contact No. Contact No. 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 volt- age is applied through the form “b” contact. Contact Operation Table 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. 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) 3) 4a4b Type 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. Internal 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. External Contacts Weld 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. Energized Contact gap min 0.5 mm .020 inch Weld Non-energized If the No. 1 contact welds. The adjacent No. 2 contact maintains a gap of greater than 0.5 mm .020 inch. The other con- tacts, because the coil is not energized, return to their normal return state; each of form “a” con- tacts (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. 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) For Cautions for Use, see Relay Technical Information (Page 48 to 76). 9/1/2000 All Rights Reserved, © Copyright Matsushita Electric Works, Ltd. Go To Online Catalog