RELAYS Panasonic

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Panasonic is part of a large worldwide groupselling relays and associated switching products under different brand names in different territories.The conditions of use in some territories may differ from those customary in Europe. In particular there are often major differences in regard to national and international specifications, such as UL, CSA, VDE, SEV, EVE, SEMKO, etc. Thus, when considering contact loads as stated in this catalogue (e.g. 10 A, 30 VDC for the SP relay) its hould be understood that these values are not necessarily an absolute maximum but tested ratings. Mostly the stated value has been tested for a certain life expectancy as stated by the manufacturer or the respective test house. Thus, under different conditions, the stated “maximum” may, in practice, be safely exceeded.

Vydal: Panasonic Electric Works Czech s.r.o. Autor: Panasonic

Strana 952 z 1090

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5 1pF per contact current r: 0.5 per contact voltage Values vary depending the properties of the load and variations relay characteristics. Capacitor “c” acts to suppress the discharge the moment the contacts open. Test confirm.) the immediate vicinity the load contact. This circuit also slightly delays the release time. Although inductive loads are usually more difficult switch than resistive loads, use the proper protection circuit will raise the characteristics that for resistive loads.General Application Guidelines amperes), always necessary to conduct actual confirmation tests. This occurs from the reaction with nitrogen and oxygen the air when sparks (arc discharge) are generated during switching. (G: Good, NG: Good, Conditional) Circuit Application AC DC Features/Others Devices Selection CR circuit If the load timer, leakage current flows through the circuit causing faulty operation. As a guide, the distance should within 50cm. Therefore, care required in circuits where sparks are generated a high frequency. Diode circuit NG The diode connected parallel causes the energy stored the coil flow the coil the form current and dissipates it as joule heat the resistance component of the inductive load. • tin tiv e In the actual circuit, necessary to locate the protective device (diode, resistor, capacitor, varistor, etc. This circuit further delays the release time compared the CR circuit. times the release time listed the catalog) Use diode with reverse breakdown voltage least times the circuit voltage and forward current least large as the load current. However, note that incorrect use will result adverse effect. Use type capacitors (non­ polarized) for circuits. C tio Use contact protective devices or protection circuits can suppress the counter low level. Contact G Contact Contact G Contact G Contact G G • Avoid using the protection circuits shown in the figures the right. Effective when connected both contacts if the power supply voltage 48V and the voltage across the load 100 to 200V. * used with voltage, sure the impedance the load sufficiently smaller than that the circuit If the load relay solenoid, the release time lengthens. Although extremely effective arc suppression as the contacts open, the contacts are susceptible welding since charging current flows “C” when the contacts close. Diode and zener diode circuit NG Effective when the release time the diode circuit too long. Use zener diode with zener voltage about the same the power supply voltage. Varistor circuit Using the stable voltage characteristics of the varistor, this circuit prevents excessively high voltages from being applied across the contacts. If located too far away, the effectiveness of the protective device may diminish. electronic circuits where the circuit voltages are not high, a diode can used with reverse breakdown voltage about times the power supply voltage. Resistor “r” acts limit the current when the power turned the next time. ds_x61_en_relay_technical_information_091112D 13 . • h fr itc s ( tio ) If, for example, valve clutch is switched high frequency, blue- green corrosion may develop. As guide selecting and r, c: 0. Use capacitor “c” with breakdown voltage 200 to 300V. Effective when connected both contacts the power supply voltage 48V and the voltage across the load 100 200V. No good - Contact _ Power 'S ' supply o T No good - Contact _ Power - ' supply C TJ L to - o J r Although extremely effective arc suppression as the contacts open, the contacts are susceptible welding since energy stored in “C” when the contacts open and short-circuit current flows from “C” when the contacts close. Typical contact protection circuits are given the table below