{"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\/el\/%cf%85%cf%80%ce%bf%cf%83%cf%84%ce%ae%cf%81%ce%b9%ce%be%ce%b7\/ta-acutator\/s2-in-actuator","title":{"rendered":"\u03a4\u03b9 \u03c3\u03b7\u03bc\u03b1\u03af\u03bd\u03b5\u03b9 \u03bf \u03ba\u03cd\u03ba\u03bb\u03bf\u03c2 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1\u03c2 S2 \u03c3\u03b5 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03b7\u03c4\u03ad\u03c2 (\u03b7\u03bb\u03b5\u03ba\u03c4\u03c1\u03b9\u03ba\u03ad\u03c2 \u03b2\u03b1\u03bb\u03b2\u03af\u03b4\u03b5\u03c2);"},"content":{"rendered":"
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

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>

\u039f 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>

    \u03a3\u03cd\u03bc\u03c6\u03c9\u03bd\u03b1 \u03bc\u03b5 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>, \u03c4\u03bf S2 duty cycle duration can be extended<\/strong>.<\/p><\/li>

      • If the actual operating temperature is higher than the rated temperature<\/strong>, \u03c4\u03bf 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>, \u03c4\u03bf S2 operation time should be reduced<\/strong> to avoid excessive heating.<\/p><\/li><\/ul>

          \u03a3\u03cd\u03bd\u03b1\u03c8\u03b7<\/strong><\/h2>

          \u039f 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":"

            \u03a0\u03bf\u03bb\u03bb\u03bf\u03af \u03ac\u03bd\u03b8\u03c1\u03c9\u03c0\u03bf\u03b9 \u03ad\u03c7\u03bf\u03c5\u03bd \u03b5\u03c1\u03c9\u03c4\u03ae\u03c3\u03b5\u03b9\u03c2 \u03c3\u03c7\u03b5\u03c4\u03b9\u03ba\u03ac \u03bc\u03b5 \u03c4\u03bf\u03bd \u03ba\u03cd\u03ba\u03bb\u03bf \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1\u03c2 S2 \u03c3\u03b5 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03b7\u03c4\u03ad\u03c2 \u03ae \u03b7\u03bb\u03b5\u03ba\u03c4\u03c1\u03b9\u03ba\u03ad\u03c2 \u03b2\u03b1\u03bb\u03b2\u03af\u03b4\u03b5\u03c2. \u03a4\u03b9 \u03c3\u03b7\u03bc\u03b1\u03af\u03bd\u03b5\u03b9 \u03ba\u03b1\u03b9 \u03b3\u03b9\u03b1\u03c4\u03af \u03bf\u03c1\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03bc\u03b5 \u03b1\u03c5\u03c4\u03cc\u03bd \u03c4\u03bf\u03bd \u03c4\u03c1\u03cc\u03c0\u03bf; 1. \u0397 \u03c0\u03c1\u03bf\u03ad\u03bb\u03b5\u03c5\u03c3\u03b7 \u03c4\u03c9\u03bd \u03ba\u03cd\u03ba\u03bb\u03c9\u03bd \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1\u03c2 S1, S2, S3 \u03ba\u03b1\u03b9 S6 \u039f\u03b9 \u03ba\u03cd\u03ba\u03bb\u03bf\u03b9 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1\u03c2 S1, S2, S3 \u03ba\u03b1\u03b9 S6 \u03c0\u03c1\u03bf\u03ad\u03c1\u03c7\u03bf\u03bd\u03c4\u03b1\u03b9 \u03b1\u03c0\u03cc \u03c4\u03b9\u03c2 \u03c4\u03b1\u03be\u03b9\u03bd\u03bf\u03bc\u03ae\u03c3\u03b5\u03b9\u03c2 \u03c4\u03c9\u03bd \u03b7\u03bb\u03b5\u03ba\u03c4\u03c1\u03b9\u03ba\u03ce\u03bd \u03ba\u03b9\u03bd\u03b7\u03c4\u03ae\u03c1\u03c9\u03bd, \u03bc\u03b5 \u03ba\u03cd\u03c1\u03b9\u03b1 \u03b5\u03c3\u03c4\u03af\u03b1\u03c3\u03b7 \u03c3\u03c4\u03b7 \u03b8\u03b5\u03c1\u03bc\u03b9\u03ba\u03ae [\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\/el\/wp-json\/wp\/v2\/posts\/5530","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dclcontrols.com\/el\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dclcontrols.com\/el\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dclcontrols.com\/el\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dclcontrols.com\/el\/wp-json\/wp\/v2\/comments?post=5530"}],"version-history":[{"count":0,"href":"https:\/\/dclcontrols.com\/el\/wp-json\/wp\/v2\/posts\/5530\/revisions"}],"wp:attachment":[{"href":"https:\/\/dclcontrols.com\/el\/wp-json\/wp\/v2\/media?parent=5530"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dclcontrols.com\/el\/wp-json\/wp\/v2\/categories?post=5530"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dclcontrols.com\/el\/wp-json\/wp\/v2\/tags?post=5530"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}