Miniature Signal Relay Function and Notes on Correct Use
Contents
1. Solid state relay Figure 1 Classification of Relays 3 2 Operational Functions This section describes the operations of the coil which is the input section of a relay and the contacts which constitute the output section Generally when a current flows through the coil of a relay the contacts operate The contacts of an ordinary relay release when acurrent ceases to flow through the coil With some relays however contacts once they have operated remain set and do not return to the original state even after the current supplied to the coil is removed These relays are called latching relays Incidentally the former type of relay is called a non latch type or current holding type The latching relay is further divided into two types by classification of coil single coil latch type which has only one coil and double coil latch type which has two coils 1 Relay operation Figures 2 1 through 2 3 illustrate the operations of the three types of relays mentioned above by using timing charts D Non latch type current holding type Energized Coil Not energized Contacts Release Figure 2 1 Timing Chart of Non Latch Type 2 Single coil latch type Energized Not energized Contacts Reset Figure 2 2 Timing Chart of Single Coil Latch Type A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please cont2. 1 Use of magazine case stoppers Relays are packaged in magazine cases for shipment When some relays are taken out from the case and space is freed inside the case be sure to secure the relays in the case with a stopper If the relays are not well secured vibration during transportation may cause contact problems Push in to secure the relays Figure 21 Storage in Magazine Case 2 Do not use relays that have been dropped If an individual relay product falls from the work table etc a shock of 1000 G or more is applied to the relay and its functions may be destroyed Even if the shock is apparently weak confirm that there is no abnormality before using the relay 27 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 4 9 Using Surface Mount Relays This section describes specific points to be noted when using a surface mount relay For common points for both types refer to the previous section 1 Mounting pad Determine the dimensions of the mounting pads on a printed circuit board taking into consideration such factors as solderabi
3. A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 3 Notes on mounting T Chucking When a relay is mounted using an automatic machine note that application of an excessive external force to the cover at the time of chucking or insertion of the relay may damage or change the characteristics of the cover Temporary securing to printed circuit board Avoid bending the pins to temporarily secure the relay to the printed circuit board Refer to figure 20 Bending the pins may degrade sealability or adversely influence the internal mechanism Pin bending may be allowed under certain conditions in the case of miniature signal relays Contact NEC for details Good example Bad example Figure 20 Bending Relay Pins 3 Soldering work The following conditions are recommended for soldering a relay onto a printed circuit board a Automatic soldering Flow solder is recommended lt Recommended conditions gt Preheating 100 C max 1 min max Solder temperature 250 C max Solder time 5 to 10 seconds b Manual soldering by soldering iron
4. Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 4 5 Influence of Relay Operation on Surroundings 1 Electromagnetic noise Switching the relay coil generates a high electromotive force due to induction In general a surge suppression circuit is connected in parallel with the relay coil to suppress generation of this electromotive force However if this suppression circuit is not appropriate electronic circuits such as microcontrollers may malfunction due to the surge generated Add an appropriate absorption circuit to prevent electronic circuits from malfunctioning due to the surge generated 2 Arc discharge Connecting disconnecting a high current at the relay contacts generates an arc discharge This discharge may cause electronic circuits such as microcontrollers to malfunction and therefore it is necessary to take appropriate measures 3 Generation of leakage magnetic flux Leakage magnetic flux exists in the vicinity of the relay in the magnetized state Mounting a magnetic sensor etc close to the relay may cause malfunctioning 4 6 Mounting 1 Design of printed circuit boards D If an electronic circuit such as a microcontroller is placed close to a relay noise generated by the relay may cause malfunctioning D When designing patterns keep to the shortest possible distance in wiring G For the printed c
5. gt Returns to a eei eee ie C00 OD c Not energized set state d After voltage applied to reset coil reset state Figure 3 3 Double Coil Latch Type Operations A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 3 3 Contact Arrangement The contacts of the NEC s miniature signal relays are divided into two types transfer contacts and continuous contacts Figure 4 shows the operation state of each type of contact Break Make Break Make Break Make contact contact contact contact contact contact Transfer 1 contacts i i i Common Common Common contact contact contact i Before operation During operation After operation Break Make Break Make Break Make contact contact contact contact contact contact a O O gt 0 O Continuous 1 contacts i i i Common Common Common j contact j contact j contact i Before operation During operation After operation Figure 4 Operation States of Each Contact 1
6. lt Recommended conditions gt Solder temperature 350 C max Solder time 2 to 3 seconds Ventilation immediately after soldering is completed is recommended Avoid immersing the board in cleaning solvent immediately after soldering otherwise thermal shock may be applied to it 4 Pin cutting after soldering Do not cut the pins of the relay with a revolving blade or an ultrasonic cutter because vibration that is applied to the relay during the cutting may change the relay characteristics 26 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 4 7 Cleaning 1 Cleaning solvent Use of alcohol or water based cleaning solvents is recommended Never use thinner or benzene because these solvents may damage the relay housing A sealed type relay can be immerse cleaned because solvent does not penetrate inside the relay 2 Avoid ultrasonic cleaning Ultrasonic cleaning may cause a break in the coil wire or sticking of the contacts due to the energy of vibration Use ultrasonic cleaning with only the models designed for it 4 8 Handling Relays
7. Figure 9 shows examples of the mounting magnetization and change in the must operate voltage of signal relays in the EA2 series In applications where these characteristics changes pose a problem itis necessary to reduce the mounting density 23 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E Changes in must operate voltage Set sample Number of samples 10 each ON y ON OFF OFF ON OFF OOO COL 20 Maximum value 7 fi L ON OFF 3 z ome 1 5 gt 10 Minimum value 20 30 ON _ E _ OFF 40 E oooi WV ON L OLI OFF Mounting method onj LL OFF V operate voltage Rate of change in must LILIE lt LL E Figure 18 Dense Mounting 24 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase
8. Functions of transfer contacts The common contact of the transfer contacts touches the make contact after it has been separated from the break contact when the relay operates When the relay releases the common contact is separated from the make contact and comes in contact with the break contact Therefore when the relay operates there is a time during which the common contact is not in contact with either make or break contacts transfer time For this reason the transfer contacts may also be referred to as break before make BBM contacts These operations are illustrated in the timing chart below Energized Coil voltage Not energized ON OFF Break contact Make contact 3 ON o OFF o W a O Operate time E A J Release time D a 3 Bounce time i Bounce time Transfer time T a Oe Transfer time Figure 5 1 Timing Chart of Transfer Contacts 10 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E The operate time is the time during which the make contact comes in contact with the common contact ON state a
9. 60s pla 90s max Figure 23 Solder Reflow Temperature Conditions Example of EB2 Series 3 Long term storage Problems with airtightness may occur due to the solder heat after moisture absorption Be sure to follow the description below when storing the SMT relays a The storage humidity must be no more than 70 and the relay must be used within 3 months b When storing for more than 3 months the storage humidity must be no more than 50 and the relay must be used witthin 6 months 29 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 5 ELECTRICAL CHARACTERISTICS MEASUREMENT This chapter describes some methods to measure the electrical characteristics of a relay The methods introduced here are examples To conduct acceptance tests consult NEC These measurement methods conform to JIS C5442 testing methods of small electromagnetic relays for control applications 1 Contact resistance D The resistance between contacts when they are closed ON is measured by the voltage drop method Set the supply voltage voltage between
10. closed after the coil has been deenergized With a latching relay time required for the relay to enter the reset state after a voltage has been applied to the coil the break contact is closed Usually the applied voltage should be a rectangular waveform Insulation resistance Resistance between two parts electrically independent of each other such as between the contact and coil Usually this specifies the insulation resistances between the coil and contact pin between open contact pins and between adjacent contact pins if the relay has two or more contacts In addition the insulation resistance between the pins of the contacts that are open in the operate state is also specified The minimum value is specified Breakdown voltage Threshold value at which breakdown does not occur when AC voltage is applied between pins similar to insulation resistance Usually the breakdown voltage is tested for 1 minute and the current value that defines breakdown is 1 mA The minimum value is specified Shock resistivity mechanical and malfunction durabilities Threshold value indicating that no abnormality occurs even when semi sine wave pulsating mechanical shock has been applied to the relay Even after the shock has been applied the contacts that have been opened do not close or the contacts that have been closed are not opened Vibration resistivity mechanical and malfunction durabilities In the same manner as shock threshold value
11. common contact comes in contact with the make contact before the break contactis opened For this reason the continuous contacts may also be referred to as make before break MBB contacts 11 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E A relay of this contact arrangement is used to continuously switch over from circuit A to B as shown in figure 6 where when viewed from the power source there is a little deenergized state and the two circuits are instantaneously connected in parallel 1 A z c a 1 1 1 1 Before operation Make contact Break contact During operation Circuit A Power source CircuitB 8 After operation Figure 6 Example of Use of Continuous Contacts 3 4 Contact Material The contacts of the NEC s miniature signal relay is made of a silver nickel alloy AgNi in the case of the general purpose model The base metal of the contacts of the high reliability model is silver palladium alloy AgPd The silver nickel alloy has a low contact resistance and an excelle
12. pins when the contacts are open to 6 Vdc and the measurement current to 1 A with controlling current limit resistance decreasingly As a simple method use a low ohmmeter by Hewlette Packard HP 4338A To measure the resistance of the make contact apply the rated voltage to the coil G The contact resistance is the value including the conductor resistance of the pins Nominal _ _ coil voltage 7 i i 6 Vdc Figure 24 Measuring Contact Resistance 2 Operation voltages must operate and must release voltages D Apply a pulsating voltage to the coil and observe the contact state To generate the coil voltage use of a programmable power supply is convenient To observe the contact state apply the potential signal of the contacts to the input of the inverter and observe changes in the output state voltage drop when the contacts are closed and supply voltage when the contacts are open 5V A Programmable Relay power supply pee eee l Inverter Contact potential signal Personal computer Contact signal I O port used Figure 25 Measuring Operation Voltages 30 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in
13. subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 2 Single coil latch type When voltage of the polarity specified to set S in figure 3 2 a the coil is applied to the coil in figure 3 2 b the contacts operate Even after the coil is deenergized the contacts remain in the operate state figure 3 2 c When voltage of the polarity specified to reset R the coil is applied to the coil the contacts release figure 3 2 d a oe gt gt pce an a Not energized reset state b After voltage application set state WM A _ Q 9 O 9 O S R s R gt Return to a p Seer ee c Not energized set state d After voltage application reset state Figure 3 2 Single Coil Latch Type Operations G Double coil latch type As shown in figure 3 3 a through d the double coil latch type relay has two separate coils each of which operates sets and releases resets the contacts Togo got O99 go gt gt o a Not energized reset state b After voltage applied to set coil set state EEI ge Eo ego gt
14. tics of the varistor Inductive load Pay attention to the reverse breakdown voltage of the diode Diode Zener diode A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Inductive load Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog The ON time of the diode is controlled by using the Zener voltage characteristic and the recovery time of the relay can be shortened 2006 03 24 PO159EMDDO3VOL01E 15 b Capacitive load Never use a connection with a capacitor only as shown in table 2 Table 2 Examples of Wrong Circuits Using Capacitiors This circuit is effective for arc suppression when the contacts are opened but WRONG This circuit is effective for arc suppression when the N contacts are opened but when the contacts are closed a capacitor short circuit current flows making the contacts more when the contacts are closed a capacitor charg fo ing current flows making the contacts more suscep susceptible to metal deposition tible to metal deposition c Loads of lam
15. type a Inductive load With an inductive load when the contacts are opened to break the circuit a counter electromotive force is generated This voltage causes arc discharge between the contacts The charged energy accelerates metal deposition and wear on the contact surface A protection circuit is therefore used to absorb the counter electromotive force N Contacts open Inductive load E Time Figure 8 Inductive Load Circuit 14 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E Table 1 shows examples of protection circuits Protection element Capacitor resistor CR circuit Table 1 Inductive Load Contact Protection Circuit Circuit example a Inductive load c Inductive load q Remarks contact voltage V 0 5 to 1 c uF 0 5 to 1 x contact current A Non breakdown voltage of a non polar capacitor should be 300 V or higher Varistor Inductive load High voltage is suppressed by using the voltage characteris
16. when sine wave vibration has been repeatedly applied to the relay 34 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E Operating temperature range Temperature range in which the stable performances of the relay can be drawn out Usually the coil voltage rating is specified as the coil input and the contact load is specified as the maximum value Mechanical life Life expressed as the number of operations that can be performed when the nominal coil voltage is applied to the relay with the contacts not loaded and the relay is operated at the rated operating frequency Electrical life Switching life of the contacts expressed as the number of operations measured when the rated voltage is applied to the relay and the relay is operated at the rated operating frequency with the rated load is applied to the contacts 35 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for deta
17. NEC TOKIM User s Manual MINIATURE SIGNAL RELAY FUNCTIONS AND NOTES ON CORRECT USE NEC TOKIN Corporation 2006 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E The information in this document is based on documents issued in March 2006 at the latest The information is subject to change without notice For actual design in refer to the latest publications of data sheet etc for the most up date specifications of the device No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC TOKIN Corporation NEC TOKIN Corporation assumes no responsibility for any errors which may appear in this document NEC TOKIN Corporation does not assume any liability for infringement of patents copyrights or other intellectual property rights of third parties by or arising from use of a device described herein or any other liability arising from use of such device No license either express implied or otherwise is granted under any patents copyrights or other intellectual property righ
18. a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 6 Drive circuit latching relay The drive circuit of a latching relay is especially important Therefore special attention needs to be paid to the drive circuit of a latching relay in this section D Since the coil of a relay has an inductive impedance a counter electromotive force is generated when the circuitis opened This voltage may damage the relay driver IC Therefore with a double coil latch type current holding relay a diode is connected in parallel with each coil as shown in figure 13 With a single coil latching type relay however a diode cannot be used because the current direction of the coil is inverted Therefore the driver circuit of this relay must be designed and confirmed in the actual circuit 4 i Set coil Reset coil r 3 33 Set pulse K Reset pulse K Figure 15 Drive Circuit of Latching Relay Example D A latching relay is driven by a pulsating coil voltage The pulse width of this drive voltage must be 10 ms or wider If the pulse is too short the relay may not operate G Apply a voltage to the coil in the polarity specified by the internal connection diagram of the relay With a double coil latching type relay do not a
19. act NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 3 Double coil latch type Energized Set Coil Gr es oe eee el Not energized Reset E Coil 0 Not energized _ Energized Set Contacts Reset Figure 2 3 Timing Chart of Double Coil Latch Type As illustrated in these figures the contacts of a latching relay remain in the operate state even after an input to the coil has been removed Therefore this relay plays the role of a memory circuit Moreover the latching relay helps reduce the power dissipation in the application circuit because the coil needs not to be energized all the time 2 Internal connections The internal connections of the three types of relays are described below using NEC s representative model EA2 series as an example When connecting coils refer to the wiring diagram to prevent mis operation or malfunction Non latch type Figure 3 1 a shows the state where no current flows through the coil When voltage is applied to the pole shown in Figure 3 1 b the contacts operate O Y a Not energized b Energized Figure 3 1 Non Latch Type Operation A All specifications in this catalog and production status of products are
20. ane copper wire which is Type E of JIS C4003 and whose permissible temperature is 120 C Derating factor 50 per 45 C 150 100 ratio to rated voltage 40 20 0 20 40 60 80 100 Maximum applied voltage to coil Ambient temperature Ta C Figure 12 Coil Voltage vs Temperature Derating Characteristics Example 18 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 3 Hot start When the temperature of a relay has risen due to heat generated when the relay has been energized the relay may not operate even if the coil is energized again immediately after it has been deenergized once This is because the coil resistance has increased when it has been energized the first time Consequently to reoperate the relay an increased voltage must be applied This state is called hot start When the relay is used in a location where ambient temperature is high or if the rated voltage of the relay cannot be applied appropriate countermeasures must be taken against a hot start For the hot start voltage to operate the relay re
21. ception failure of continuous contacts The continuous contacts are suitable for applications where two circuits must be changed over in a time shorter than that of the transfer contacts because the continuous contacts are continuously switched However a interception failure does occur in the application circuit because of the bounce of the contacts and a thorough evaluation must be made before the continuous contacts are actually used in an application Because the miniature signal relay has little bounce the momentary power failure is kept to a relatively short time For details consult NEC Momentary interception failure evaluation circuit Timing chart of momentary interception failure B y Power i Energization supply A R O M Coil Current voltage 9 pe ee meas B Continuous Continuous resistor Recovery l o i P 2R Contact Yi Operate i A current i M operating 90 a status Note If a momentary power failure occurs the voltage across the resistor is zero Figure 17 Momentary Power Failure of Continuous Contacts 22 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other
22. ct data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 2 PRODUCT CODE LEGEND NEC offers small new and ultra small type miniature signal relays The product names of these relays consist of codes indicating the function of each relay EA2 3S NU Option Latch type None Non latch ty pe S Single coil latch type T Double coil latch type Nominal coil voltage Value of nominal coil voltage Series name A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 3 CLASSIFICATION OF NEC s MINIATURE RELAYS 3 1 General Classification NEC s miniature signal relays are classified as follows Electromechanical relay Miniature relay Miniature signal relay Miniature power relay Sealed contact relay 7 Reed relay Mercury reed relay
23. ctual circuit The table below shows load current range guideline Current range 100 uA to 1mA 1mA to 0 5A 0 5A to 2A Application GOOD VERY GOOD NOT SO GOOD for some cases Contacts may be unstable Thermal electro motive force and contact noise should be taken into consideration Contacts are stable and highly reliable Infrequent operation poses no problem but frequent operation deteriorates contact stability Use of a power relay is preferred for 1 A or higher 2 When using the relay with a high current or high capacitance load an inrush current may cause contact dislocation or deposition therefore check the feasibility of use in the actual circuit 3 Be sure to use the relay at an ambient temperature within the maximum ratings otherwise the life of the relay will be radically shortened If use outside the specified temperature range in unavoidable consult NEC 4 With a relay whose coil polarity is specified in its internal circuit diagram apply the polarity of the rated voltage as specified Note that when a rippled DC power source is used abnormalities such as beat in the coil may occur 5 Exercise care when handling the relay so as not to apply shock to it or drop it 6 The flow soldering conditions are for 5 to 10 seconds at 250 C 7 When cleaning use alcohol or a water based solvent Avoid using ultrasonic cleaning If it is necessar
24. d must be confirmed before the relay is used refer to 2 in Maximum applied voltage The operating characteristics of the relay change with ambient temperature refer to figure 11 below Confirm the temperature condition in the application set where the relay is to be used For the temperature characteristics of a relay refer to Technical Documents D 2 x ke 130 H Must operate 130 H Operate Ea PE i oe S420 Must release Z 409 Release 25 te ge wo A 52110 5 110 a6 Qe i 2 100 0100 ae D gt E 2 Laen Eg 90 Pa Be 90 8 go 17 52 80 geL 70 Oo 70 40 20 0 20 40 60 80 100 40 20 0 20 40 60 80 100 Ambient temperature Ta C Ambient temperature Ta C Figure 11 Temperature Characteristics of Relay Example 2 Maximum applied voltage The coil of a relay generates heat when itis energized therefore the temperature which is the difference between the designed maximum temperature of the relay and the ambient temperature is the permissible maximum heat temperature voltage Refer to the coil voltage vs temperature derating characteristics in the catalog The designed maximum temperature is determined mainly by the coil wire materials and the permissible temperature of plastic materials The coil wire of the NEC s miniature signal relay is a polyureth
25. e circuits This standard requires that the relay used in the circuit terminal withstand a certain value of surge voltage and have a certain breakdown voltage The following figure and table show the specific values of the surge and breakdown voltages Surge voltage Condition t2 us Vmax V 50 ti lt gt Time Figure 31 Surge Voltage Waveform Applied AC voltage Condition 1000 Vac sine wave AC effective value Condition D 1500 Vac sine wave AC effective value The above voltage must be applied a between opening contacts b between adjacent contacts and c between the coil and contact of a relay so as to prove that the relay has no problem 38 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E
26. eaeesaeeeeeeasaeeeeas 6 CLASSIFICATION OF NEC s MINIATURE RELAYS ccccsceseseeeseeeeeeseeeeseeeeseeeeseeeeeeneesseeenseeees 7 3 1 General Classification cccccsscsseesseeesseceeseeseeseeseeeeveneeeseeseeeeesaesoesoesessaeseeseeseeseeeeseneeesaesonsesaesenensanen 7 3 2 Operational FUNCTIONS ccc cceeeeseseeeseeecesseeseesseeeseesseeseesseusaesnaessessaeesoessousaesaaesaneaaessausonesauesaesaneaaesoaes 3 3 Contact Arrangement F 3 4 Contact Material ccc cccsesscesseeeseessesseeseeseeseeesenesoesnesaesenesaeesaeesaesessaeseousausuansseuuenssaeseneuaeenaeuanaeaennaes NOTES ON CORRECT USE 00 cccicccccccctsscictuc sence ce seresecerectenecnecsenactenevereececnueunedceraueeseousseacescenusveneeds 13 AA General sissscscscissececcaccesecssscssctisssosstedcasassatccsiteccsscsaacessacsborisassssnaazannstzacdaasisccasctaasaacsadsassdzsassussaeassnacaaasitaacasaas 13 4 2 Connecting Contact Load Minimum Load Contact Protection Circuit sesesesnsnnrnsururernnnnrururarnrennururarunnnnnnunurnnnnnurnnnnnnnnnnnnn nnne 13 4 3 Driving Relays Ambient Temperature Maximum Applied Voltage Hot Start Latching Relay Drive Waveform Non operation and Holding Voltages c ccccscssssessescesseessessesseessessoesseesoessaesanensessoesseseaesonsesnenaenenes 18 4 4 Environments Ambient Temperature Humidity Atmosphere Atmospheric Pressure Vibration and Shock Influence of Magnetic Fields cccscessesseeesees
27. ecial models NEC s relays are filled with nitrogen gas instead of air to stabilize the contact performances Case cover Epoxy resin Base Pin Figure 28 Plastic sealing 3 Life The life of a relay refers to the life of the contacts This is because the life of the contacts is limited by wear and deposition of contact metal To specify the life a certain load condition must be defined In NEC s catalogs life is specified under several representative load conditions An increase in contact resistance and non separation of contacts i e the contacts cannot be opened account for the major part of failures 36 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 4 Contact noise Immediately after the contacts have been closed the surfaces of the contacts come in contact with each other mechanically and electrically However the contact spring that holds the contact is vibrating due to repulsive energy that has been generated when the contacts have collided At this time because the contact spring vibrates near the magnetic circuit
28. ed product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E Must operate voltage Minimum voltage required to place the make contact in operate state from the release state Normally the contact should be driven by a rectangular waveform voltage The maximum value is specified In the case of a latching relay this term means a voltage set voltage that is required to place the relay in the set state from the reset state Must release voltage Maximum voltage to place the relay in the release state the break contact is closed from the operate state refer to 5 2 The minimum value is specified In the case of a latching relay the maximum value necessary for placing the relay in the reset state from the set state and is expressed as a reset voltage The maximum value is specified Operate time Time required for the contact to operate the make contact is closed after voltage control input has been applied to coil With a latching relay time required for the relay to enter the set state after a voltage has been applied to the coil the make contact is closed Usually the applied voltage should be a rectangular waveform Release time Time required for the relay to enter the release state the break contact is
29. erance of 10 usually applies Maximum coil voltage The maximum voltage that can be applied to the coil Usually the ambient temperature is specified as a condition Coil temperature rise Rise of the coil temperature at a given input power or voltage Power dissipation rating of coil A product of the coil voltage rating and coil current Normal power dissipation to operate the relay Contact resistance Resistance between contacts closed ON Actually this is the sum of the contact resistance and conductor resistance The maximum initial value on delivery is usually set forth on the catalog Maximum switching voltage Maximum voltage switchable with relay contact The peak value is indicated in the catalog under DC load The effective value rms is indicated under AC load Maximum switching current Maximum current switchable with relay contact Maximum switching power Maximum load power switchable with relay contact The value under DC load is expressed in W and that under AC load is expressed in VA Maximum carry current Maximum current that can flow between contacts when the contacts are closed Minimum switching power Minimum load power through relay contact necessary for normal operation Expressed as the minimum values of voltage and current 33 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updat
30. esigned to be highly sensitive it may operate by mistake if a pulsating noise whose pulse width is shorter than the normal drive voltage is applied to the coil for a short time Therefore exercise care that such an unwanted voltage is not applied to the coil The device recovers from this phenomenon after the coil voltage has been removed and then contacts have operated as shown in the timing chart in figure 16 The relationship between the magnitude of the coil voltage that causes the above phenomenon and the pulse width is similar to that illustrated below however this should be confirmed with the actual circuit Timing chart of unwanted voltage Relation between pulse time width and coil voltage Pulse time width ms 1 0 Coil voltage i 0 5 Pulse time _1 I ol 2 l t Contacts operate 90 100 110 Recovery Operate Recovery ITTITITIT Ratio of rated coil voltage Figure 16 Malfunctioning due to Unwanted Voltage 21 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 12 Momentary inter
31. fer to the Technical Documents of each product 4 Non operation and holding voltages In an application circuit of a relay the relay must not operate or release at a certain voltage In this case the non operation and holding voltages of the relay must be known To do so confirm the variations of the operate voltage and release voltage of the relay with NEC s Technical Documents and other documents If the necessary holding voltage and non operation voltage cannot be secured because of variations of the relay special specification models are readily available from NEC E 5 Q B Must release Must operate 2 voltage voltage 5 Oo D D a 0 Must release Holding Non must Must operate Rated voltage rated voltage operate voltage voltage rated voltage Figure 13 Example of Distribution of Relay Operate Voltage 5 Drive waveform It is not desirable that the waveform of the voltage applied to a relay coil gradually increase and decrease The voltage must instantaneously rise and fall as a pulse If the voltage gradually increases and decreases the relay does not perform its snap action and its fullest performance cannot be attained Pulse Correct Xx Incorrect avoid Non pulse Figure 14 Relay Drive Waveform 19 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for
32. fter the coil has been energized This operate time includes the transfer time during which the common contact is not in contact with either the make or the break contacts The transfer time of the NEC s miniature signal relay is several 100 us O An electromechanical relay such as a miniature signal relay has a bounce time until the contacts are completely closed This bounce time of the NEC s miniature signal relay is several 100 us to several ms G Similarly when the relay is released and therefore when the common contact is separated from the make contact and comes in contact with the break contact transfer time and bounce time exist The values of these times are same as those when the relay operates A relay of this contact arrangement is used to switch over between two circuits and to completely set one circuit free from the influences of the other circuit 2 Functions of continuous contacts The common contact of the continuous contacts may come in contact with both the make and break contacts continuous time This is illustrated by the timing chart in figure 5 2 Energized Coil voltage Not energized ON OFF Break contact Make contact ON OFF IIl o gt e Bounce time gt e Bounce time S Operate time Continuous state i i i i i i e a E a Continuous time Continuous time Figure 5 2 Timing Chart of Continuous Contacts As shown in this timing chart the
33. h a ground pin 5 Breakdown voltage D Apply a surge voltage or AC voltage between insulated conductors and confirm that breakdown does not occur D Use a breakdown voltage tester and apply the specified voltage to the sample for 1 minute Set the detection break current that detects breakdown and protect the sample from damages to 1 mA According to JIS a test in which 110 of the specified voltage is applied to the sample for 1 second can be used instead if there is no problem for measurement G Measure the breakdown voltage at the same pins as those at which the insulation resistance is measured 32 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 6 TERMINOLOGY This chapter describes the major technical terms set forth in the Data Sheet and related manuals 6 1 Terms Related to Standards The terms used in NEC s catalogs in connection with standards and performances are as follows Nominal coil voltage A standard voltage applied to the coil to use the relay Coil resistance DC resistance of the coil Usually measured at 25 C A tol
34. hpa However if it is used under other pressure conditions its sealability may be destroyed or the relay may be deformed causing functional trouble Be sure to use the relay under normal pressure conditions 5 Vibration and shock The vibration resistance and shock resistance of a relay are as shown in the catalog and use of the relay under conditions other than those specified may cause malfunctions or damage Be sure to use the relay within those vibration and shock conditions Note that operation of a snap switch mounted close to the relay or shock by operation of an electromagnet may cause malfunctioning 6 Influence of magnetic fields The magnetic circuit of an NEC miniature signal relay is constructed so that the relay does not easily malfunction due to influence of external magnetic fields However under the influence of magnetic flux leaking from a transformer speaker or magnet placed in the vicinity of the relay the must operate voltage must release voltage operate time release time and other dynamix characteristics may change In applications where these characteristics changes pose problems it is necessary to take measure such as magnetic shielding Also when many make them miniature signal relays are closely located the magnetic flux leaking from those relays may make them interfere with each other causing changes in the must operate voltage must release voltage operate time release time and other dynamic characteristics
35. iled product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 6 2 Supplements This section provides supplementary information on the miniature signal relay 1 Safety standards Safety standards are regulated in many countries to prevent electric shock and fire resultant from the operation of electric products These agencies include bodies such as Electric Products Regulation in Japan UL in USA CSA in Canada and VDE in Germany However the Electric Products Regulation does not apply to the use of signal relays because their rated voltage is lower than the supply voltage of commercial power sources and the relay is not used to switch the primary side of commercial power sources Nevertheless NEC offers UL approved and CSA approved models for all miniature signal relays in the series The approval file number of each standard is common as follows UL E73266 CSA LR46266 Note that the indicated ratings of the UL and CSA approved models are different from the absolute maximum ratings 2 Plastic sealing A plastic sealing type relay consists of relay constituents such as contacts springs and a coil fixed to the base and housed in a case with the gap between the base and case is sealed with epoxy resin plastic All the NEC s signal relays are of this plastic sealing type Except some sp
36. ircuit board on which a relay is mounted use a board o 1 mm or more in thickness If the printed circuit board is not thick enough it may be subject to warpage which will add tension to the relay causing variations in the relay characteristics Because a flexible printed circuit borad is particularly thin it is necessary to solder near the root of the relay pins Since preliminary soldering of the pin root part is often insufficient its solder is likely to become loose If a thermal cycle is applied to the soldered part cracks may be generated in it Special care is required for the relay location base material and through hole shape 2 Relay mounting position The vibration resistance and shock resistance of a relay are greatly affected by its mounting position It is particularly important to select the mounting position to prevent the break contacts from being instantaneously cut due to vibration and shock The vibration resistance and shock resistance are at a minimum when the direction of vibration and shock applied to the relay matches the operation direction of the armature mobile iron piece and contacts Therefore if it is possible to anticipate the direction of vibration or shocks mount the relay so that the direction in which vibration of shocks are applied is perpendicular to the direction of the relay armature operation figure 19 shows the direction of relay armature operation A Figure 19 Direction of Armature Operation 25
37. latch type apply voltage to the set and reset coils alternately opps r aeei Load Pulse generator etc i resistance Load voltage Oscilloscope Figure 27 Measuring Time Characteristics 31 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 4 Insulation resistance D Measure the electric resistance between insulated conductors with a megohmmeter The measurement voltage is 500 Vdc The measured value changes with ambient temperature the insulation resistance decreases as the temperature rises Measure under standard conditions temperature 5 to 35 C relative humidity 60 15 Measure the insulation resistance at the following relay pins a Between opposing contacts with the make contact not energized and the break contact energized b Between adjacent contacts c Between coil and contact d Between two coils of double coil latch type between set coil and reset coil e Between ground pin and contact pin and between ground pin and coil pin with a relay wit
38. line capacitance is discharged directly through the contacts when the contacts are closed ON Generally the stray capacitance must be taken into consideration if the wiring length reaches several tens of meters In this case a current limiting resistor or surge suppressor coil is connected in series to the contacts fc suppressor coil OO DiS tad _ Contacts to suppress the peak current Power source __ Load Wiring cable Figure 10 Stray Capacitance 17 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 4 3 Driving Relays This section describes points to be noted when driving a relay 1 Ambient temperature When an NEC s relay is used at an ambient temperature exceeding or falling below the range set forth in the catalog the performance of the relay may be degraded and the life may be extremely shortened Generally use the relay in the specified temperature range at less than the maximum ratings Note however that the maximum must operate voltage of the coil changes with temperature an
39. lity insulation and mounting variations of the automatic mounter Use the dimensions of the mounting pads set forth in the catalog of the relay for reference 10 16 Figure 22 Dimensions of the Relay Mounting Pad Example of EB2 Series 28 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 2 Solder reflow The surface mount relay is highly resistant to heat However solder the relay under the correct temperature conditions so that the full performances of the relay can be attained IRS infrared ray reflow soldering and VPS vapor phase soldering methods are recommended In addition air reflow soldering may be also used Whichever soldering method is used be sure to confirm the temperature conditions for soldering and the influences of soldering on the relay in advance IRS Tmax 235 o 200 w 3 175 150 30 sec 80 sec 200 sec m gt VPS Tmax 215 G 200 C max v 165 C max 5 T D 100 C max Q o 60 s max lt Pr a
40. losing of the contacts consult NEC 20 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 9 Long continuous energizing of coil If the coil is energized continuously for along time the coil temperature may rise promoting generation of organic gas inside the relay which is likely to cause trouble in the contacts When using a circuit requiring constant operation consider the possibility of using a latching relay that does not need continuous energizing of the coil 10 Instantaneous voltage drop of circuit When the same power source is used for the relay drive circuit and the load circuit in a circuit such as a lamp load circuit where an inrush current flows the moment the contacts are closed the source voltage may drop if the power source capacitance is small In this case the relay may be released or an oscillation phenomenon where the relay repeatedly releases and operates may occur Add power source capacitance or a smoothing circuit to prevent this phenomenon 11 Malfunctioning due to unwanted voltage Because the miniature signal relay is d
41. nt mechanical durability The silver palladium alloy is highly resistant to corrosion and is employed for applications where high contact reliability is required The gold alloy is coated on these silver alloys as a contact surface to further improve the reliability The ultrasonic cleaning type employs sliver radium for the moving break contact and gold for the stationary contact By employing different metals like this immunity to adhesion due to external vibration is improved wy Wy Gold alloy overlay Base metal Stationary contact Base Normal type Ultrasonic cleaning type Figure 7 Cross Sectional View of a Contact 12 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 4 NOTES ON CORRECT USE 4 1 1 General Never allow the contact load to exceed the maximum ratings otherwise the lifetime of the relay will be dramatically shortened The lifetime specified in the catalog is for certain load conditions and other factors must be taken into consideration in actual circuits Therefore an accurate lifetime must be measured in the a
42. of the relay an electromotive force is generated due to magnetic induction Generally a peak to peak voltage of several uV to several ten mV is generated which gradually decreases toward zero This vibration of the spring may pose a problem when the relay is used in a scanning system that switches minute signals at high speeds a E gt Time Vo O gt Time Figure 29 Example of Waveform of Contact Noise 5 Twin contact A contact on a bifurcated armature as shown below is called a twin contact The merit of the twin contact is that even when foreign objects collect on the surface of one contact the other contact can normally operate and therefore a faulty contact does not occur All NEC s miniature signal relays employ this twin contact Contact Contact spring Contact Figure 30 Shape of Twin Contact 37 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 6 FCC Part68 This is Part68 of the US communications standards that regulates the terminal equipment connected to public telephon
43. pply voltage in a manner that both the set and reset coils are energized at the same time D A latching relay is factory set to the reset state for shipment However it may be set while being transported due to vibration or shock Make sure that the relay is reset when its application system starts operating When the relay is employed in a portable system the circuit must be designed so that the relay is reset at the beginning of the operation of the system because the relay may be set by unexpected vibration or shock 6 Whe configuring a self holding circuit that uses the self break contacts of the relay note that the coil drive circuit is disconnected by the self contacts causing problems such as self oscillation 7 Connection of coil diode In the case of loads such as solenoid and electromagnetic clutches that produce large discharge energy when the contacts are opened connect a Zener diode on the drive transistor side Particularly if the diode is connected to the coil in parallel the counter electromotive force of the coil returns the current gradually when the relay is released and thus may slow down the opening of the contacts intensifying wear on the contacts 8 Opening closing frequency If the contacts are opened closed frequently with a high current load repeated electric discharges may cause contact metal deposition or damage to the contact spring When using the relay with a high current load with frequent opening c
44. ps and the like inrush current Some loads such as tungsten lamps have a low initial resistance so that an inrush current of 10 times as high as the steady state current may flow through the relay on power application A high inrush current may also flow when the relay is used to switch loads such as motors capacitors and electromagnetic solenoids In these cases it is necessary to keep the current to within the maximum rated value Therefore a current limiting resistor is connected to the contacts in series Lam p Current 7 Contacts Power source _ x Without current limiting resistor With current limiting resistor Time Figure 9 Inrush Current of Loads from Lamps and the Like 16 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E d Load with large stray capacitance If the wiring length of a circuit where a relay is used is long an inrush current that is generated due to a stray capacitance poses a problem As shown in figure 10 the electric energy charged to the
45. s catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E MEMO A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 1 INTRODUCTION Miniature signal relays are widely used in the fields of communications measurement and factory automation This document describes the functions of the NEC s miniature signal relay and points to be noted when using the relay Reading both this document and the Data Sheet of each product is recommended when using a relay For further information consult NEC Proper functioning of the miniature signal relay requires appropriate circuit design mounting and evaluation according to the purpose of use Note that the responsibility for accidents caused by improper circuit design mounting or evaluation falls on you and we cannot be reponsible for them A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated produ
46. safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 4 4 Environments This section describes the environments where a relay should be used 1 Ambient temperature Ensure that the ambient temperature of the relay mounted on the device is within the operating temperature range in the catalog Use of the relay at a temperature outside this range may adversely affect insulation or contact performance For the relationship between the ambient temperature and relay drive conditions refer to 4 3 NOTES ON DRIVING RELAYS 2 Humidity Use of a sealed type relay in a high dumidity RH85 or higher environment for a long time may introduce moisture inside the relay This moisture may combine with NOx or SOx generated by glow dischanges to produce nitric acid or sulfuric acid In this case the acid produced may corrode the metal that forms the relay causing operation troubles in the relay If use of the relay in such a high humidity environment is unavoidable consult NEC in advance 3 Atmosphere Use of a relay in an atmosphere with a high concentration of sulfur gases H2S SO2 nitric acid gas HNOs ammonia NH3 silicon vaporization gas etc may cause imperfect contacts and other functional trouble Avoic use of the relay in such an atmosphere If it is unavoidable use a sealed type relay 4 Atmospheric pressure A sealed type relay maintains constant sealability under normal pressures 810 to 1200
47. seeeessesseseeseeseeseesoesoeseeseesnenessevseeeesoeeeesnsoesensoesenaenenees 23 4 5 Influence of Relay Operation on Surroundings Electromagnetic Noise Arc Discharge Generation of Leakage Magnetic Flux ssseeees 25 4 6 Mounting Design of Printed Circuit Boards Relay Mounting Position Mounting csesseeeeeeeees 25 4 7 Cleaning Cleaning Solvent Avoid Ultrasonic Cleaning s e s nsnssnsnnsennunnurnnnnnnnnnnrnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nne 27 4 8 Handling Relays Use of Magazine Case Stoppers Dropped Relay s nsnnsnsnurnnsnnnnnnnnnnnnnnnrnnrnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnn nne 27 4 9 Using Surface Mount Relays Mounting Pad Glue Pads Solder Reflow cscsssssssssecenesseeseseeseeseeeerseveeseeseesensoesoesneneesesnenenees 28 ELECTRICAL CHARACTERISTICS MEASUREMENT Contact Resistance Operate Voltage Time Characteristics Insulation Resistance Breakdown Voltage osiensa iaieineea ae peada oada do pda Ea adane rea dennad paa a Kadai naria iaia 30 TERMINOLOGY A 33 6 1 Terms Related to Standards cccccssecessssesesseeseeseessessessesessesaeseeseesnesesseeseueesseesesaeseessesausaeeaesasseesneeneae 33 6 2 SUPPlEMeNts cc cceeeseeseeseeeeeseeeseesseeseesseeseessoeseeesaeesouseesaeusousaeesaessousanesaessaesanesaevsauseusaeseaesaesnaeusnuuneeney 36 Please request for a specification sheet for detailed product data prior to the purchase Before using the product in thi
48. t systems or medical equipment for life support etc The quality grade of NEC TOKIN devices is Standard unless otherwise specified in NEC TOKIN s Data Sheets or Data Books If customers intend to use NEC TOKIN devices for applications other than those specified for Standard quality grade they should contact an NEC TOKIN sales representative in advance Note 1 NEC TOKIN as used in this statement means NEC TOKIN Corporation and also includes its majority owned subsidiaries 2 NEC TOKIN electronic component products means any electronic component product developed or manufactured by or for NEC TOKIN as defined above DE0102 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data 6 CONTENTS INTRODUCTION Paa E EE EE E E veuasvonerdauucks 5 PRODUCT CODE LEGEND escccsseeeesseeeeeeeeeeeeeeeeeenseeeeseneessaeeasaeeeseeeeeeeeaseaeaseeaess
49. this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E O To measure the must operation voltage gradually increase the pulse voltage applied to the coil To measure the must release voltage decrease the coil voltage stepwise from the rated voltage to a certain value If a pulsating voltage cannot be obtained easily use a slope voltage In this case however the measured value will not be accurate Voltage Rating m z e eee Pulse Must operate t Must release Time Voltage Rating 24 4 2 s 445 4 Must operate Slope Must release Time Figure 26 Measuring Waveform of Operation Voltage Coil Voltage 3 Time characteristics operate time and release time O Apply a pulse voltage to the coil and measure the time difference required for the contacts to change their states Q A single pulse with a pulse width of 10 ms is the best as the coil voltage However a repetitive pulse at about 10 Hz can also be used To observe the contact state connect a load of 5 V 10 mA and use an oscilloscope G The time characteristics of the non latch type current hold type relay can be measured with the following circuit Apply voltage in both the positive and negative directions to the single coil latch type relay With the double coil
50. ts of NEC TOKIN Corporation or others While NEC TOKIN Corporation has been making continuous effort to enhance the reliability of its electronic components the possibility of defects cannot be eliminated entirely To minimize risks of damage or injury to persons or property arising from a defect in an NEC TOKIN electronic component customers must incorporate sufficient safety measures in its design such as redundancy fire containment and anti failure features NEC TOKIN devices are classified into the following three quality grades Standard Special and Specific The Specific quality grade applies only to devices developed based on a customer designated Quality assurance program for a specific application The recommended applications of a device depend on its quality grade as indicated below Customers must check the quality grade of each device before using it in a particular application Standard Computers office equipment communications equipment test and measurement equipment audio and visual equipment home electronic appliances machine tools personal electronic equipment and industrial robots Special Transportation equipment automobiles trains ships etc traffic control systems anti disaster systems anti crime systems safety equipment and medical equipment not specifically designed for life support Specific Aircrafts aerospace equipment submersible repeaters nuclear reactor control systems life suppor
51. y to use ultrasonic cleaning use a product resistant to such cleaning 8 Sonic noise may occur during the relay operation Depending on the mounting position the sonic noise may sound intolerable so be sure to check the mounting position thoroughly prior to use 4 2 Connecting Contact Load 1 Minimum load Use the relay at a voltage and current higher than the minimum load otherwise the contact resistance will increase and signal cannot be correctly transmitted In addition self cleaning effect which electrically and mechanically eliminates minute substances generated on the contact surface when the contacts are opened and closed cannot be expected 13 A All specifications in this catalog and production status of products are subject to change without notice Prior to the purchase please contact NEC Tokin for updated product data Please request for a specification sheet for detailed product data prior to the purchase Before using the product in this catalog please read Precautions and other safety precautions listed in the printed version catalog 2006 03 24 PO159EMDDO3VOL01E 2 Contact protection circuit By providing a protection circuit that suppresses transient current and voltage applied to the contacts when the contacts are opened or closed the switching life of a relay can be improved The applicable protection circuit differs depending on the load type of the contacts D Protection circuit classified by load
Download Pdf Manuals
Related Search