{"id":5530,"date":"2023-07-03T14:56:24","date_gmt":"2023-07-03T06:56:24","guid":{"rendered":"https:\/\/www.dcl-controls.com\/?p=5530"},"modified":"2025-03-31T09:07:10","modified_gmt":"2025-03-31T09:07:10","slug":"s2-in-actuator","status":"publish","type":"post","link":"https:\/\/dclcontrols.com\/nb_no\/stotte\/ta-akutator\/s2-i-aktuator","title":{"rendered":"Hva betyr S2 driftssyklus i aktuatorer (elektriske ventiler)?"},"content":{"rendered":"
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Many people have questions about the S2 duty cycle<\/strong> in actuators or electric valves. What does it mean, and why is it defined this way?<\/p>

1. The Origin of S1, S2, S3, and S6 Duty Cycles<\/strong><\/h2>

Den S1, S2, S3, and S6 duty cycles<\/strong> originate from electric motor classifications, with a primary focus on thermal balance. The goal is to ensure that the motor does not overheat due to continuous operation<\/strong>.<\/p>

Definitions of Common Motor Duty Cycles:<\/strong><\/h3>

  • S1 (Continuous Duty Cycle):<\/strong> Operates at a constant load for a long enough period to reach thermal equilibrium.<\/p><\/li>

  • S2 (Short-Time Duty Cycle):<\/strong> Operates under a constant load for a set time, but not long enough to reach thermal equilibrium<\/strong>, then stops to cool down before the next operation.<\/p><\/li>

  • S3 (Intermittent Periodic Duty Cycle):<\/strong> Operates in repeating cycles of “running under load” and “stopping” with no impact from startup currents on temperature rise.<\/p><\/li>

  • S6 (Continuous Periodic Duty Cycle):<\/strong> Alternates between loaded running and unloaded running<\/strong> in repeating cycles, but without stopping entirely.<\/p><\/li><\/ul>

    <\/p>

    2. S2 Duty Cycle in Actuators (Electric Valves)<\/strong><\/h2>

    Since actuators (electric valves) use electric motors as their drive mechanism<\/strong>, defining the duty cycle is essential to prevent overheating<\/strong>.<\/p>

    If\u00f8lge JB\/T 8219-2016<\/strong> (China’s industrial standard for electric actuators in process control systems), the actuator\u2019s temperature rise must not exceed 60\u00b0C<\/strong>.<\/p>

    S2 Duty Cycle Notation in Actuators<\/strong><\/h3>

    • S2-75%:<\/strong> Specifies the duty ratio<\/strong> (the percentage of time the actuator motor is powered on while operating the valve).<\/p><\/li>

    • S2-30min:<\/strong> Specifies the maximum continuous operation time<\/strong> before the actuator must be turned off to cool down.<\/p><\/li><\/ul>

      <\/p>

      3. Practical Considerations for Using S2 Duty Actuators<\/strong><\/h2>

      \u2714 Temperature Affects S2 Duration<\/strong><\/p>

      • If the actual operating temperature is lower than the rated temperature<\/strong>, den S2 duty cycle duration can be extended<\/strong>.<\/p><\/li>

      • If the actual operating temperature is higher than the rated temperature<\/strong>, den S2 duration must be reduced<\/strong> to prevent overheating.<\/p><\/li><\/ul>

        \u2714 Load Affects S2 Duration<\/strong><\/p>

        • If the actuator is operating under a lower load<\/strong> than its rated capacity, the duty cycle duration can be extended<\/strong>.<\/p><\/li>

        • If the actuator is under a higher load<\/strong>, den S2 operation time should be reduced<\/strong> to avoid excessive heating.<\/p><\/li><\/ul>

          Konklusjon<\/strong><\/h2>

          Den S2 duty cycle<\/strong> in actuators defines the safe operation time before cooling is required<\/strong> to prevent overheating. When selecting an actuator, consider:<\/p>

          • How long it needs to run continuously<\/strong><\/p><\/li>

          • The surrounding temperature<\/strong><\/p><\/li>

          • The valve\u2019s load requirements<\/strong><\/p><\/li><\/ul>

            Understanding these factors ensures longer lifespan and reliable performance<\/strong> of electric actuators.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

            Mange har sp\u00f8rsm\u00e5l om S2-driftssyklus i aktuatorer eller elektriske ventiler. Hva betyr det, og hvorfor er det definert p\u00e5 denne m\u00e5ten? 1. Opprinnelsen til driftssyklusene S1, S2, S3 og S6 Driftssyklusene S1, S2, S3 og S6 stammer fra klassifiseringer av elektriske motorer, med hovedfokus p\u00e5 termisk [...].<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_theme","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[8],"tags":[53,66,57,52,55,65],"class_list":["post-5530","post","type-post","status-publish","format-standard","hentry","category-ta-acutator","tag-actuator","tag-explosion-proof-actuator","tag-general-actuator","tag-fast-move-actuator","tag-tech-ref","tag-very-small-actuator-tag"],"acf":[],"_links":{"self":[{"href":"https:\/\/dclcontrols.com\/nb_no\/wp-json\/wp\/v2\/posts\/5530","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dclcontrols.com\/nb_no\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dclcontrols.com\/nb_no\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dclcontrols.com\/nb_no\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dclcontrols.com\/nb_no\/wp-json\/wp\/v2\/comments?post=5530"}],"version-history":[{"count":0,"href":"https:\/\/dclcontrols.com\/nb_no\/wp-json\/wp\/v2\/posts\/5530\/revisions"}],"wp:attachment":[{"href":"https:\/\/dclcontrols.com\/nb_no\/wp-json\/wp\/v2\/media?parent=5530"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dclcontrols.com\/nb_no\/wp-json\/wp\/v2\/categories?post=5530"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dclcontrols.com\/nb_no\/wp-json\/wp\/v2\/tags?post=5530"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}