How to determine wiring of DC motor controller | Electronics Forum (Circuits, Projects and Microcontrollers)

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It may not display this or other websites correctly.<br />You should upgrade or use an <a href="https://www.google.com/chrome/" target="_blank" rel="noopener">alternative browser</a>.</div> <div class="p-body-header"> <div class="p-title "> <h1 class="p-title-value">How to determine wiring of DC motor controller</h1> </div> <div class="p-description"> <ul class="listInline listInline--bullet"> <li> <i class="fa--xf fal fa-user" aria-hidden="true" title="Thread starter"></i> <span class="u-srOnly">Thread starter</span> <a href="/members/koyote.328095/" class="username u-concealed" dir="auto" data-user-id="328095" data-xf-init="member-tooltip">koyote</a> </li> <li> <i class="fa--xf fal fa-clock" aria-hidden="true" title="Start date"></i> <span class="u-srOnly">Start date</span> <a href="/threads/how-to-determine-wiring-of-dc-motor-controller.166938/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-11-23T14:30:20-0800" data-time="1732401020" data-date-string="Nov 23, 2024" data-time-string="2:30 PM" title="Nov 23, 2024 at 2:30 PM">Today at 2:30 PM</time></a> </li> </ul> </div> </div> <div class="p-body-main p-body-main--withSidebar "> <div class="p-body-contentCol"></div> <div class="p-body-sidebarCol"></div> <div class="p-body-content"> <div class="p-body-pageContent"> <div class="block block--messages " data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-166938"> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container"> <div class="block-body"> <article class="message message--post js-post js-inlineModContainer " data-author="koyote" data-content="post-1457774" id="js-post-1457774" > <span class="u-anchorTarget" id="post-1457774"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar message-avatar--online"> <div class="message-avatar-wrapper"> <a href="/members/koyote.328095/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="328095" data-xf-init="member-tooltip" style="background-color: #99cc33; color: #2e3d0f"> <span class="avatar-u328095-m" role="img" aria-label="koyote">K</span> </a> <span class="message-avatar-online" tabindex="0" data-xf-init="tooltip" data-trigger="auto" title="Online now"></span> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/koyote.328095/" class="username " dir="auto" data-user-id="328095" data-xf-init="member-tooltip">koyote</a></h4> <h5 class="userTitle message-userTitle" dir="auto">New Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/how-to-determine-wiring-of-dc-motor-controller.166938/post-1457774" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-11-23T14:30:20-0800" data-time="1732401020" data-date-string="Nov 23, 2024" data-time-string="2:30 PM" title="Nov 23, 2024 at 2:30 PM">Today at 2:30 PM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/how-to-determine-wiring-of-dc-motor-controller.166938/post-1457774" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1457774/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/how-to-determine-wiring-of-dc-motor-controller.166938/post-1457774" rel="nofollow"> #1 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1457774" data-lb-caption-desc="koyote · Nov 23, 2024 at 2:30 PM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">I have a DC motor that came with a speed controller like in the picture. The controller is connected to the motor with a 4-pin connector. Nothing is labeled except the power source which says: 24V 4.17A 100W<br /> <br /> I want to replace the controller with a DAC for automation and need to find out which pins of the connector do what. I could just start probing with a multimeter but I dont want to short anything. I also dont want to dissasemble the controller or the motor.<br /> <br /> I assume:<br /> 1) two pins are power from the power source which supply the controller. <br /> 2) the other two pins are the regulated power from the controller to supply the motor and adjust its speed.<br /> <br /> My uneducated approach would be to disconnect the controller, power up the device, and test between the pins looking for 24V. Once I find that +24 I dont know where to go from there. I'll have three pins unknown. I also suppose sparks could by flying during this process, which I dont want.<br /> <br /> My totally ignorant next step would be to find something with resistance like maybe a 24V 100W light bulb, and test between the +24 and the other three poles. My hope would be to light up the bulb without the motor running. Then I would have found #1 above - the two pins that power the controller.<br /> <br /> So then what? Directly wire those two pins to the other remaining pins and hope the motor turns at full speed? And if it doesnt, disconnect as quickly as humanly possible while sniffing for burning smells? Then, directly wire those two pins to the other remaining two pins and surely the motor will turn at full speed, thushly accomplishing the task.<br /> <br /> Any ideas?</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> <section class="message-attachments"> <h4 class="block-textHeader">Attachments</h4> <ul class="attachmentList"> <li class="file file--linked"> <a class="u-anchorTarget" id="attachment-147835"></a> <script class="js-extraPhrases" type="application/json"> { "lightbox_close": "Close", "lightbox_next": "Next", "lightbox_previous": "Previous", "lightbox_error": "The requested content cannot be loaded. 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The controller is connected to the motor with a 4-pin connector. Nothing is labeled except the power source which says: 24V 4.17A 100W\n\nI want to replace the controller with a DAC for automation and need to find out which pins of the connector do what. I could just start probing with a multimeter but I dont want to short anything. I also dont want to dissasemble the controller or the motor.\n\nI assume:\n1) two pins are power from the power source which supply the controller. \n2) the other two pins are the regulated power from the controller to supply the motor and adjust its speed.\n\nMy uneducated approach would be to disconnect the controller, power up the device, and test between the pins looking for 24V. Once I find that +24 I dont know where to go from there. I'll have three pins unknown. I also suppose sparks could by flying during this process, which I dont want.\n\nMy totally ignorant next step would be to find something with resistance like maybe a 24V 100W light bulb, and test between the +24 and the other three poles. My hope would be to light up the bulb without the motor running. Then I would have found #1 above - the two pins that power the controller.\n\nSo then what? Directly wire those two pins to the other remaining pins and hope the motor turns at full speed? And if it doesnt, disconnect as quickly as humanly possible while sniffing for burning smells? Then, directly wire those two pins to the other remaining two pins and surely the motor will turn at full speed, thushly accomplishing the task.\n\nAny ideas?", "answerCount": 0, "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/koyote.328095/", "name": "koyote", "url": "https://www.electro-tech-online.com/members/koyote.328095/" }, "suggestedAnswer": [] }, "publisher": { "@type": "Organization", "name": "Electronics Forum (Circuits, Projects and Microcontrollers)", "description": "An electronics forum to talk all about circuits and projects.", "url": "https://www.electro-tech-online.com" } } </script>  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MMC9PJ9" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>   <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-KLX5R59" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>  <script> $(function(){ var notice = $('.xb-welcome-notice'); if(notice.length){ var cookie = XF.Cookie.get('hide_welcome_notice'); if(!cookie){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else if ((Date.now() - cookie) > 8.64e+7){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else { notice.hide(); } } }); </script> </div> </body> </html>

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How to determine wiring of DC motor controller | Electronics Forum (Circuits, Projects and Microcontrollers)