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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For parts with low failure rates, “failure unit (Fit) 10-9 / hour” often used instead failure rate. short, reliability has three senses: i. only three bulbs remained alive, the degree reliability is 3/10 30%. 2 lia ility e T rm Every product has finite service lifetime. indicates the mean tim period which system, equipment, part operates normally between two incidences repair. MTBF tells how long product can be used without the need for repair. lia ility e T rm In the industrial world, reliability an index how long particular product serves without failure. For repairable products, their serviceability aintainability another problem. F MTTF acronym mean tim to failure. addition, reliability product design becoming serious concern for the manufacturing industry. In the relay industry, reliability use has a significance aspects servicing. This represents the probability which system, equipment, part, which has continued normal operation certain point of time, becomes faulty the subsequent specified tim period. 1. 2. Sometimes MTBF used represent the service lifetime before failure.e. indicates the mean tim period until product becomes faulty MTTF normally applies unrepairable products such parts and materials. MTBF only applies repairable products. 3. lia ility lia ility o e Reliability “built” into products. ilu te Failure rate includes mean failure rate and entary failure rate. The relay one such objective of MTTF. F MTBF acronym mean time between failures. This means that product can continue normal service infinitely. For example, none light bulbs has failed for 100 hours, the degree of reliability defined in, 100 hours tim is 10/10 100%. 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. 22 ds_x61_en_relay_technical_information_091112D .Reliability RELIABILITY [1] WHAT RELIABILITY? 1. Mean failure rate defined follows: Mean failure rate Total failure count/ total operating hours In general, failure rate refers to momentary failure rate. lia ility Degree reliability represents percentage ratio reliability. reliability of the product itself, serviceability the product, and reliability product design. Failure rate often represented the unit percent/hours. Percent/count normally used for relays. Product reliability the user's site is called “reliability use”, which consists mainly reliability the broad sense. 4. hen product has broken down, the user may throw it Reliability (broad sense) away repair it. 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. aintainability M TTR P reven tive aintenance, predicted m aintenance 3. This is referred intrinsic reliability which consists mainly reliability the narrow sense. lia bility (narrow sense), durability Long life tim TTF, 10, R(T), L failure rate: Lam (^), MTBF 2.9% MTBF 100 hours MTTF 100 hours Failure rate fit, /hour Safe life B10 hours (b) MTTF (c) Safe life 1. Availability 3. The reliability of repairable products recognized as “reliability broad sense the term ”