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| (pending) POLARISED, MONOSTABLE SAFETY RELAY SF-RELAYS Double contact * Separated chamber structure (2 Form A 2 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. * High breakdown voltage 2,500 Vrms between contacts and coil * High sensitivity Realizes thin shape and high sensitivity (500 mW nominal operating power) by utilizing high-efficiency polarized magnetic circuit with 4-gap balanced armature. * Complies with safety standards Standard products are UL, CSA, TUV and SEV certified. Comform to European standards. TUV certified (945/EL, 178/ 88). Complies with SUVA European standard. FEATURES 53.30.3 2.098.012 25.0 .984 16.50.5 .650.020 2 Form A 2 Form B 53.30.3 2.098.012 330.5 1.299.020 16.50.5 .650.020 4 Form A 4 Form B mm inch * High contact reliability High contact reliability is achieved through the use of a double contact. * Forced operation contacts (2 Form A 2 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) There are 4 points of forced operation contacts. 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. SPECIFICATIONS Contact Contact 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 Expected Mechanical (at 180 cpm) life (min. operations) Electrical (at 20 cpm) 2 Form A 2 Form B 4 Form A 4 Form B Characteristics Contact arrangement Max. operating speed Initial insulation resistance*1 2 Form A 4 Form A 2 Form B 4 Form B 180 cpm (at nominal voltage) 30 m Gold-flashed silver alloy 6 A 250 V AC, 6 A 30 V DC 1,500 VA, 180 W 440 V AC, 30 V DC 6A 107 105 Min. 1,000 M at 500 V DC Between open contacts 1,300 Vrms Initial breakdown Between contact sets 2,500 Vrms voltage*2 Between contact and coil 2,500 Vrms Approx. 17 ms Approx. 18 ms Operate time*3 (at nominal voltage) Release time (without diode)*3 (at nominal voltage) Temperature rise (at nominal voltage) (at 20C) Shock resistance Functional*4 Destructive*5 Functional*6 Vibration resistance Destructive Conditions for operation, Ambient transport and storage*7 (Not temp. freezing and condensing at Humidity low temperature) Unit weight Approx. 7 ms Approx. 6 ms Coil Nominal operating power Remarks * Specifications will vary with foreign standards certification ratings. *1 Measurement at same location as "Initial breakdown voltage" section *2 Detection current: 10mA *3 Excluding contact bounce time *4 Half-wave pulse of sine wave: 11ms; detection time: 10s *5 Half-wave pulse of sine wave: 6ms *6 Detection time: 10s *7 Refer to 6. Usage, transport and storage mentioned in NOTES 500 mW Max. 45C with nominal coil voltage and at 6 A carry current Min. 294 m/s2 {30 G} Min. 980 m/s2 {100 G} 10 to 55 Hz at double amplitude of 2 mm 10 to 55 Hz at double amplitude of 2 mm -40C to +70C -40F to +158F 5 to 85% R.H. Approx. 38 g 1.34 oz Approx. 47 g 1.66 oz 4 ORDERING INFORMATION Ex. SF 2 D DC 5 V Coil voltage DC 5, 12, 24, 48, 60 V Contact arrangement 2: 2 Form A 2 Form B 4: 4 Form A 4 Form B TYPICAL APPLICATIONS * Industrial equipment such as presses and machine tools UL/CSA, TUV, SEV approved type is standard TYPES AND COIL DATA (at 20C 68F) Contact arrangement Part No. SF2D-DC5V SF2D-DC12V SF2D-DC24V SF2D-DC48V SF2D-DC60V SF4D-DC5V SF4D-DC12V SF4D-DC24V SF4D-DC48V SF4D-DC60V Nominal voltage, V DC 5 12 24 48 60 5 12 24 48 60 Pick-up voltage, VDC (max.) 3.75 9 18 36 45 3.75 9 18 36 45 Drop-out voltage, V DC (min.) 0.5 1.2 2.4 4.8 6.0 0.75 1.8 3.6 7.2 9.0 Coil resistance (10%) 50 288 1.152 4.608 7.200 50 288 1.152 4.608 7.200 Nominal operating current, mA (10%) 100 41.7 20.8 10.4 8.3 100 41.7 20.8 10.4 8.3 Nominal operating power, mW 500 500 500 500 500 500 500 500 500 500 Max. allowable voltage, V DC 6 14.4 28.8 57.6 72 6 14.4 28.8 57.6 72 mm inch Schematic (Bottom view) 5 1 6 7 8 2 Form A 2 Form B 4 Form A 4 Form B DIMENSIONS 1. 2 Form A 2 Form B 160.5 .630.020 2 0.5 .020 5.08 .200 12.7 .500 12.7 .500 53.30.3 2.098.012 5 6 7 8 9 10 11 12 12.7 .500 3.00.5 .118.020 PC board pattern (Bottom view) 2.54 .100 10-1.4 DIA. HOLES 10-.055 DIA. HOLES 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 2. 4 Form A 4 Form B Schematic (Bottom view) 13 160.5 .630.020 0.3 .012 5.08 .200 12.7 .500 12.7 .500 53.30.3 2.098.012 12.7 .500 3.00.5 .118.020 17 18 19 20 1 5 9 2 6 10 7 11 8 12 14 15 16 PC board pattern (Bottom view) 330.5 1.299.020 7.62 .300 2 9 17 10 18 11 19 12 20 13 5 1 14 6 15 7 16 8 7.62 .300 12.7 .500 7.62 .300 2.54 .100 2.54 .100 18-1.4 DIA. HOLES 18-.055 DIA. HOLES General tolerance: 0.3 .012 Tolerance: 0.1 .004 5 REFERENCE DATA 1. Operate/release time (without diode) Tested sample: SF2D-DC24V Quantity: n = 20 2. Temperature rise Tested sample: SF4D-DC24V Quantity: n = 6 Coil applied voltage: 100%V, 120%V Contact carry current: 6A 30 25 Inside the coil 20 3. Ambient temperature characteristics Tested sample: SF4D-DC12V Quantity: n = 6 50 Operate/release time, ms Rate of change, % 100 40 Temperature rise, C 50 Drop-out voltage 30 Operate time 20 Max. x Min. Max. x Min. -40 -20 15 10 5 0 0 20 40 Pick-up voltage 60 80 Ambient temperature, C Contact -50 10 Release time 0 70 80 90 100 110 120 130 Coil applied voltage, %V 100 110 120 Coil applied voltage, %V -100 6 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. Internal 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. 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 (No. 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 (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. 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 Energized Non-energized (when no. 1 contact is welded) 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. 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. 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 No. No.8 No.7 No.1 No.2 Contact No. 1 2 Welded contact No. 3 4 5 6 7 8 1 >0.5 >0.5 >0.5 2 >0.5 >0.5 >0.5 >0.5 >0.5 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 No.6 No.5 No.3 No.4 >0.5: contact gap is kept at min. 0.5 mm .020 inch : contact closed Empty cells: either closed or open Contact No. No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8 Terminal No. 20-19 12-11 8-7 16-15 13-14 5-6 9-10 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. 7 NOTES 1. Coil operating power Pure DC current should be applied to the coil. The wave form should be rectangular. If it includes ripple, the ripple factor should be less than 5%. However, check it with the actual circuit since the characteristics may be slightly different. 2. Coil connection When connecting coils, refer to the wiring diagram to prevent mis-operation or malfunction. 3. Cleaning For automatic cleaning, the boiling method is recommended. Avoid ultrasonic cleaning which subjects the relays to high frequency vibrations, which may cause the contacts to stick. It is recommended that a fluorinated hydrocarbon or other alcoholic solvents be used. 4. Soldering We recommend the following soldering conditions 1) Automatic soldering 1) Preheating: 100C 212F, max. 60 s 2) Soldering: 250C 482F, max. 5 s 5. Others 1) If the relay has been dropped, the appearance and characteristics should always be checked before use. 2) The cycle lifetime is defined under the standard test condition specified in the JIS* C 5442-1986 standard (temperature 15 to 35C 59 to 95F, humidity 25 to 85%). Check this with the real device as it is affected by coil driving circuit, load type, activation frequency, activation phase,ambient conditions and other factors. Also, be especially careful of loads such as those listed below. (1) When used for AC load-operating and the operating phase is synchronous. Rocking and fusing can easily occur due to contact shifting. (2) High-frequency load-operating When high-frequency opening and closing of the relay is performed with a load that causes arcs at the contacts, nitrogen and oxygen in the air is fused by the arc energy and HNO3 is formed. This can corrode metal materials. Three countermeasures for these are listed here. 1. Incorporate an arc-extinguishing circuit. 2. Lower the operating frequency 3. Lower the ambient humidity 3) For secure operations, the voltage applied to the coil should be nominal voltage. In addition, please note that pickup and drop-out voltage will vary according to the ambient temperature and operation conditions. 4) Heat, smoke, and even a fire may occur if the relay is used in conditions outside of the allowable ranges for the coil ratings, contact ratings, operating cycle lifetime, and other specifications. Therefore, do not use the relay if these ratings are exceeded. Also, make sure that the relay is wired correctly. 5) Incorrect wiring may cause unexpected events or the generation of heat or flames. 6) Check the ambient conditions when storing or transporting the relays and devices containing the relays. Freezing or condensation may occur in the relay, causing functional damage. Avoid subjecting the relays to heavy loads, or strong vibration and shocks. 6. Usage, transport and storage conditions 1) Ambient temperature, humidity, and atmospheric pressure during usage, transport, and storage of the relay: (1) Temperature: -40 to +70C -40 to +158F (2) Humidity: 5 to 85% RH (Avoid freezing and condensation.) The humidity range varies with the temperature. Use within the range indicated in the graph below. 2/19/2003 All Rights Reserved, (c) Copyright Matsushita Electric Works, Ltd. Go To Online Catalog ;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;; Humidity, %R.H. 85 Tolerance range (Avoid freezing when (Avoid used at temperatures condensation when lower than 0C 32F) used at temperatures higher than 0C 32F) 5 -40 -40 0 +32 Temperature, C F +70 +158 (3) Atmospheric pressure: 86 to 106 kPa Temperature and humidity range for usage, transport, and storage: 2) Condensation Condensation forms when there is a sudden change in temperature under high temperature and high humidity conditions. Condensation will cause deterioration of the relay insulation. 3) Freezing Condensation or other moisture may freeze on the relay when the temperatures is lower than 0C 32F. This causes problems such as sticking of movable parts or operational time lags. 4) Low temperature, low humidity environments The plastic becomes brittle if the relay is exposed to a low temperature, low humidity environment for long periods of time. |
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