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 961 z 1090

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MTBF tells how long product can be used without the need for repair. This represents the probability which system, equipment, part, which has continued normal operation certain point of time, becomes faulty the subsequent specified tim period. Product reliability the user's site is called “reliability use”, which consists mainly reliability the broad sense.e. For repairable products, their serviceability aintainability another problem. 1. esign reliability H factor, redundancy, fo l-proof, fail-safe [2] RELIABILITY MEASURES The following list contains some the most popular reliability measures: R eliability measure Sample representation Degree reliability R(T) 99. 2 lia ility e T rm Every product has finite service lifetime. hen product has broken down, the user may throw it Reliability (broad sense) away repair it. Availability 3.Reliability RELIABILITY [1] WHAT RELIABILITY? 1. lia ility lia ility o e Reliability “built” into products. lia ility Degree reliability represents percentage ratio reliability. indicates the mean tim period until product becomes faulty MTTF normally applies unrepairable products such parts and materials. 22 ds_x61_en_relay_technical_information_091112D . F MTTF acronym mean tim to failure. MTBF only applies repairable products. The JIS Z8115 standard defines the degree reliability follows: The probability which system, equipment, part provides the specified functions over the intended duration under the specified conditions. reliability of the product itself, serviceability the product, and reliability product design. indicates the mean tim period which system, equipment, part operates normally between two incidences repair. The relay one such objective of MTTF. ilu te Failure rate includes mean failure rate and entary failure rate. short, reliability has three senses: i. This means that product can continue normal service infinitely. Mean failure rate defined follows: Mean failure rate Total failure count/ total operating hours In general, failure rate refers to momentary failure rate. lia bility (narrow sense), durability Long life tim TTF, 10, R(T), L failure rate: Lam (^), MTBF 2. In the relay industry, reliability use has a significance aspects servicing. only three bulbs remained alive, the degree reliability is 3/10 30%. aintainability M TTR P reven tive aintenance, predicted m aintenance 3. 2. lia ility e T rm In the industrial world, reliability an index how long particular product serves without failure. Failure rate often represented the unit percent/hours. Sometimes MTBF used represent the service lifetime before failure. 4. F MTBF acronym mean time between failures. 3. This is referred intrinsic reliability which consists mainly reliability the narrow sense. Percent/count normally used for relays. addition, reliability product design becoming serious concern for the manufacturing industry. For example, none light bulbs has failed for 100 hours, the degree of reliability defined in, 100 hours tim is 10/10 100%.9% MTBF 100 hours MTTF 100 hours Failure rate fit, /hour Safe life B10 hours (b) MTTF (c) Safe life 1. For parts with low failure rates, “failure unit (Fit) 10-9 / hour” often used instead failure rate. The reliability of repairable products recognized as “reliability broad sense the term ”