{"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\/zh_hk\/%e6%94%af%e6%8f%b4\/ta-acutator\/s2-in-actuator","title":{"rendered":"\u57f7\u884c\u5668\uff08\u96fb\u52d5\u95a5\uff09\u4e2d\u7684 S2 \u4f54\u7a7a\u6bd4\u662f\u4ec0\u9ebc\u610f\u601d\uff1f"},"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>

\u7684 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>

    \u6839\u64da 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>,......\u3002 S2 duty cycle duration can be extended<\/strong>.<\/p><\/li>

      • If the actual operating temperature is higher than the rated temperature<\/strong>,......\u3002 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>,......\u3002 S2 operation time should be reduced<\/strong> to avoid excessive heating.<\/p><\/li><\/ul>

          \u7d50\u8ad6<\/strong><\/h2>

          \u7684 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":"

            \u5f88\u591a\u4eba\u5c0d\u57f7\u884c\u5668\u6216\u96fb\u52d5\u95a5\u4e2d\u7684 S2 \u4f54\u7a7a\u6bd4\u6709\u7591\u554f\u3002\u5b83\u662f\u4ec0\u9ebc\u610f\u601d\uff1f\u70ba\u4ec0\u9ebc\u9019\u6a23\u5b9a\u7fa9\uff1f 1. S1\u3001S2\u3001S3 \u548c S6 \u4f54\u7a7a\u6bd4\u7684\u7531\u4f86 S1\u3001S2\u3001S3 \u548c S6 \u4f54\u7a7a\u6bd4\u6e90\u81ea\u65bc\u99ac\u9054\u5206\u985e\uff0c\u4e3b\u8981\u95dc\u6ce8\u71b1\u6027\u80fd [\u2026]<\/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\/zh_hk\/wp-json\/wp\/v2\/posts\/5530","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dclcontrols.com\/zh_hk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dclcontrols.com\/zh_hk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dclcontrols.com\/zh_hk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dclcontrols.com\/zh_hk\/wp-json\/wp\/v2\/comments?post=5530"}],"version-history":[{"count":0,"href":"https:\/\/dclcontrols.com\/zh_hk\/wp-json\/wp\/v2\/posts\/5530\/revisions"}],"wp:attachment":[{"href":"https:\/\/dclcontrols.com\/zh_hk\/wp-json\/wp\/v2\/media?parent=5530"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dclcontrols.com\/zh_hk\/wp-json\/wp\/v2\/categories?post=5530"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dclcontrols.com\/zh_hk\/wp-json\/wp\/v2\/tags?post=5530"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}