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 949 z 1090

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6 lta it W hen the voltage impressed the coil is increased slowly, the relay transferring operation unstable, the contact pressure drops, contact bounce increases, and unstable condition of contact occurs. hen driving relays with timers, micro computers and thyristors, etc., there may synchronization with the power supply phase. 8 tio tiv e For long wire runs, when the line for the control circuit and the line for electric power use single conduit, induction voltage, caused induction from the power line, will applied the operation coil regardless whether or not the control signal off. Therefore, check the relay hile operating the actual system. addition, with regard the circuit, because is simple means diode prevent stray circuits, proper application should be made. the initial test (trial production), shows favorable operation, but the num ber of operations increases, contact blackening (carbonization) plus the chattering the relay creates instability performance. this case the relay and tim may not revert. the timing portion for relay R1, when the timing times out, chattering occurs causing trouble. Also, the case latching relays, using self Form B” contacts, the method self coil circuit for complete interruption used, but because the possibility trouble developing, care should taken.General Application Guidelines Figure shows example stray circuits. Figure (a), with contacts A, B, and closed, after relays R1, and R3 operate, contacts and open, there series circuit through R1, , and and the relays will hum and sometimes not restored the drop out condition. The connections shown Figure (b) are correctly made. In e Therefore, when wiring spans long distance please rem ber that along with inductive interference, connection failure may caused problem with distribution capacity the device might break down due the influence of externally caused surges, such that caused lightning. Instability point Rib _ Ria Ria: Form contact relay R- Rib: Form contact relay R- Ri Reed type relay Capacitor R2: Reed type relay Variable resistance (for time adjustment) Figure “Not good example": timing and sequential operation using reed type relay Ri a 7 tio g If switching the relay contacts is synchronized with the phase the AC power, reduced electrical life, welded contacts, locking phenomenon (incom plete release) due contact material transfer may occur. This method applying voltage the coil should not used, and consideration should given the method impressing voltage the coil (use switching circuit). The circuit shown Figure causes a timing and sequential operation using a reed type relay, but this not good example with mixture gradual increase of impressed voltage for the coil and a suicide circuit. 10 ds_x61_en_relay_technical_information_091112D