{"id":21916,"date":"2026-09-17T16:13:08","date_gmt":"2026-09-17T09:13:08","guid":{"rendered":"https:\/\/sonha.com\/?p=21916"},"modified":"2026-09-17T16:13:49","modified_gmt":"2026-09-17T09:13:49","slug":"vi-sao-cua-tu-dong-dong-mo-cham","status":"publish","type":"post","link":"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/","title":{"rendered":"Why does an automatic door open and close slowly? Causes and solutions"},"content":{"rendered":"<p><em>Why does an automatic door open and close slowly? This is one of the most <a href=\"https:\/\/sonha.com\/en\/top-10-common-automatic-door-problems\/\">common automatic door problems<\/a> after a period of use, particularly in areas with high opening and closing frequency. The door may move slowly from the beginning of the opening cycle, take longer to close, or no longer operate at a stable speed as before. This condition does not necessarily indicate a serious failure. Door movement speed is affected by various factors, from software settings and safety mechanisms to door leaf load, sensors, and the condition of the sliding rail and drive system. Identifying the exact cause will help determine the appropriate solution and avoid damage caused by unauthorized adjustments.<\/em><\/p>\n<p style=\"text-align: center; margin: 40px 0;\"><a style=\"display: inline-block; background: #d71920; color: #ffffff; padding: 18px 42px; border-radius: 8px; font-size: 20px; font-weight: bold; text-decoration: none; font-family: inherit;\" href=\"#\">WARRANTY &amp; MAINTENANCE SERVICES HOTLINE: 0934 546 008<\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Content<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#Why_does_an_automatic_door_open_and_close_slowly\" >Why does an automatic door open and close slowly?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#The_door_speed_is_set_too_low\" >The door speed is set too low<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#The_door_leaf_has_a_heavy_load_or_an_incorrect_configuration\" >The door leaf has a heavy load or an incorrect configuration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#The_sliding_rail_is_dirty_or_obstructed\" >The sliding rail is dirty or obstructed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#Rollers_belts_or_drive_components_are_worn\" >Rollers, belts, or drive components are worn<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#The_sensor_operates_unstably_or_has_an_inaccurate_detection_area\" >The sensor operates unstably or has an inaccurate detection area<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#The_safety_slow-down_mechanism_Slow_StopSafety_Delay_is_activated\" >The safety slow-down mechanism (Slow Stop\/Safety Delay) is activated<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#How_to_perform_an_initial_check_when_an_automatic_door_opens_and_closes_slowly\" >How to perform an initial check when an automatic door opens and closes slowly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#When_does_an_automatic_door_system_need_maintenance_or_upgrading\" >When does an automatic door system need maintenance or upgrading?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#NABCO_automatic_doors_%E2%80%93_A_durable_solution_for_high-frequency_operation\" >NABCO automatic doors &#8211; A durable solution for high-frequency operation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/sonha.com\/en\/why-does-an-automatic-door-open-and-close-slowly\/#Sonha_Auto_%E2%80%93_Professional_automatic_door_consultation_maintenance_and_repair_services\" >Sonha Auto &#8211; Professional automatic door consultation, maintenance, and repair services<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Why_does_an_automatic_door_open_and_close_slowly\"><\/span>Why does an automatic door open and close slowly?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There are several common reasons why an <a href=\"https:\/\/sonha.com\/en\/automatic-door\/\">automatic door<\/a> may operate more slowly than normal. Identifying the correct cause of an automatic door problem helps determine the appropriate solution rather than adjusting the door speed without first identifying the underlying issue. Below are 6 common causes:<\/p>\n\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f21267-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"21267\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/en\/wp-json\/wp\/v2\/posts\/21916#wpcf7-f21267-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\">\n<div style=\"display: none;\">\n<input type=\"hidden\" name=\"_wpcf7\" value=\"21267\" \/>\n<input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.0.5\" \/>\n<input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/>\n<input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f21267-o1\" \/>\n<input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/>\n<input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/>\n<input type=\"hidden\" name=\"_extcf7_conditional_options\" value=\"{&quot;form_id&quot;:21267,&quot;conditions&quot;:[]}\" \/>\n<input type=\"hidden\" name=\"_extcf7_redirect_options\" value=\"{&quot;form_id&quot;:21267,&quot;redirect_options&quot;:{&quot;redirection_enable&quot;:&quot;off&quot;,&quot;custom_url_enable&quot;:&quot;off&quot;,&quot;redirect_page&quot;:&quot;&quot;,&quot;custom_urle&quot;:&quot;&quot;,&quot;redirect_new_tab&quot;:&quot;off&quot;,&quot;js_action&quot;:&quot;off&quot;,&quot;javascript_code&quot;:&quot;&quot;}}\" \/>\n<input type=\"hidden\" name=\"_wpcf7_recaptcha_response\" value=\"\" \/>\n<\/div>\n<div class=\"post-consult-form\">\n<div class=\"desc\">\n    Register your information to receive a free consultation on the optimal smart entrance solution for your project.\n<\/div>\n\n<div class=\"form-wrapper\">\n    <div class=\"item-full-ct\">\n        <span class=\"wpcf7-form-control-wrap\" data-name=\"your-name\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"Full name\" value=\"\" type=\"text\" name=\"your-name\" \/><\/span>\n    <\/div>\n\n    <div class=\"item-full-ct\">\n        <span class=\"wpcf7-form-control-wrap\" data-name=\"your-phone\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-tel\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Phone number *\" value=\"\" type=\"tel\" name=\"your-phone\" \/><\/span>\n    <\/div>\n\n    <div class=\"item-full-ct\">\n        <span class=\"wpcf7-form-control-wrap\" data-name=\"your-subject\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"Your issue \/ Consultation needs\" value=\"\" type=\"text\" name=\"your-subject\" \/><\/span>\n    <\/div>\n<\/div>\n\n<div><span class=\"wpcf7-form-control-wrap recaptcha\" data-name=\"recaptcha\"><span data-sitekey=\"6LecmHQrAAAAAMvkS6kCYrCEglVipgooAPjz6GM5\" class=\"wpcf7-form-control wpcf7-recaptcha g-recaptcha\"><\/span>\r\n<noscript>\r\n\t<div class=\"grecaptcha-noscript\">\r\n\t\t<iframe loading=\"lazy\" src=\"https:\/\/www.recaptcha.net\/recaptcha\/api\/fallback?k=6LecmHQrAAAAAMvkS6kCYrCEglVipgooAPjz6GM5\" frameborder=\"0\" scrolling=\"no\" width=\"310\" height=\"430\">\r\n\t\t<\/iframe>\r\n\t\t<textarea name=\"g-recaptcha-response\" rows=\"3\" cols=\"40\" placeholder=\"reCaptcha Response Here\">\r\n\t\t<\/textarea>\r\n\t<\/div>\r\n<\/noscript>\r\n<\/span><\/div>\n\n<button class=\"btn-primary\" type=\"submit\">Send<\/button>\n<\/div><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n\n<figure id=\"attachment_21181\" aria-describedby=\"caption-attachment-21181\" style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-21181 size-full\" title=\"C\u00e1c nguy\u00ean nh\u00e2n khi\u1ebfn c\u1eeda t\u1ef1 \u0111\u1ed9ng \u0111\u00f3ng m\u1edf ch\u1eadm\" src=\"https:\/\/sonha.com\/wp-content\/uploads\/2023\/04\/loi-ich-cua-bao-tri-cua-tu-dong-1.jpg\" alt=\"C\u00e1c nguy\u00ean nh\u00e2n khi\u1ebfn c\u1eeda t\u1ef1 \u0111\u1ed9ng \u0111\u00f3ng m\u1edf ch\u1eadm\" width=\"1200\" height=\"674\" srcset=\"https:\/\/sonha.com\/wp-content\/uploads\/2023\/04\/loi-ich-cua-bao-tri-cua-tu-dong-1.jpg 1200w, https:\/\/sonha.com\/wp-content\/uploads\/2023\/04\/loi-ich-cua-bao-tri-cua-tu-dong-1-300x169.jpg 300w, https:\/\/sonha.com\/wp-content\/uploads\/2023\/04\/loi-ich-cua-bao-tri-cua-tu-dong-1-1024x575.jpg 1024w, https:\/\/sonha.com\/wp-content\/uploads\/2023\/04\/loi-ich-cua-bao-tri-cua-tu-dong-1-768x431.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption id=\"caption-attachment-21181\" class=\"wp-caption-text\"><em>Causes of slow automatic door opening and closing<\/em><\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"The_door_speed_is_set_too_low\"><\/span>The door speed is set too low<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Automatic doors allow users to adjust the opening speed, closing speed, and hold-open time depending on the door type and the building&#8217;s usage requirements. If the initial settings are configured at a low level, the door will take longer to complete an opening and closing cycle.<\/p>\n<p>For systems that previously operated normally but suddenly slow down, technicians should check the controller to determine whether any parameters have shifted or changed.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"The_door_leaf_has_a_heavy_load_or_an_incorrect_configuration\"><\/span>The door leaf has a heavy load or an incorrect configuration<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/sonha.com\/en\/automatic-door-motor-power\/\">Load<\/a> and door leaf dimensions directly affect the motor. For heavy tempered glass door leaves or metal-framed doors, the motor must provide greater pulling force to move the door along the sliding rail.<\/p>\n<p>If the equipment configuration selected initially is not compatible with the actual door leaf weight, the system will operate under excessive load, resulting in slow door movement, particularly during the initial acceleration phase or when reaching the final deceleration point.<\/p>\n<figure id=\"attachment_20587\" aria-describedby=\"caption-attachment-20587\" style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-20587 size-full\" title=\"C\u00e1nh c\u1eeda t\u1ef1 \u0111\u1ed9ng c\u00f3 t\u1ea3i tr\u1ecdng l\u1edbn \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 v\u1eadn h\u00e0nh\" src=\"https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/su-dung-cua-tu-dong-an-toan.jpg\" alt=\"H\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng c\u1eeda t\u1ef1 \u0111\u1ed9ng an to\u00e0n t\u1ea1i c\u00e1c c\u00f4ng tr\u00ecnh hi\u1ec7n \u0111\u1ea1i\" width=\"1200\" height=\"674\" srcset=\"https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/su-dung-cua-tu-dong-an-toan.jpg 1200w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/su-dung-cua-tu-dong-an-toan-300x169.jpg 300w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/su-dung-cua-tu-dong-an-toan-1024x575.jpg 1024w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/su-dung-cua-tu-dong-an-toan-768x431.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption id=\"caption-attachment-20587\" class=\"wp-caption-text\"><em>A heavy automatic door leaf affects operating speed<\/em><\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"The_sliding_rail_is_dirty_or_obstructed\"><\/span>The sliding rail is dirty or obstructed<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>For automatic sliding doors, the door leaves move along a rail and roller system. Dust, objects trapped in the moving area, or unfavorable rail conditions can increase resistance as the door moves.<\/p>\n<p>This is a relatively easy cause to check. If the door feels heavy, moves unevenly, or produces unusual noises, the rail area and related components should be inspected.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Rollers_belts_or_drive_components_are_worn\"><\/span>Rollers, belts, or drive components are worn<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>After a long period of continuous opening and closing, the mechanical components of an automatic door naturally deteriorate:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/sonha.com\/en\/nabco-automatic-door-roller\/\">Rollers<\/a>:<\/strong> One side may become worn flat or the bearing may become seized.<\/li>\n<li><strong>Drive belt:<\/strong> The belt may become stretched, loose, or slack around the gears, resulting in belt slippage.<\/li>\n<li><strong>Pulley:<\/strong> The pulley may become misaligned or develop worn grooves.<\/li>\n<\/ul>\n<p>When transmission efficiency decreases, the motor&#8217;s force is no longer fully transferred to the door leaf, making the opening and closing cycle heavier and slower.<\/p>\n<figure id=\"attachment_19876\" aria-describedby=\"caption-attachment-19876\" style=\"width: 1024px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19876 size-large\" title=\"Ray c\u1eeda t\u1ef1 \u0111\u1ed9ng b\u1ecb m\u00e0i m\u00f2n sau th\u1eddi gian s\u1eed d\u1ee5ng g\u00e2y ti\u1ebfng \u1ed3n v\u00e0 gi\u1ea3m hi\u1ec7u su\u1ea5t\" src=\"https:\/\/sonha.com\/wp-content\/uploads\/2021\/05\/ray-boc-thep-cua-tu-dong-nabco-1-1024x768.jpg\" alt=\"ray c\u1eeda t\u1ef1 \u0111\u1ed9ng b\u1ecb m\u00e0i m\u00f2n sau th\u1eddi gian s\u1eed d\u1ee5ng g\u00e2y ti\u1ebfng \u1ed3n v\u00e0 gi\u1ea3m hi\u1ec7u su\u1ea5t\" width=\"1024\" height=\"768\" srcset=\"https:\/\/sonha.com\/wp-content\/uploads\/2021\/05\/ray-boc-thep-cua-tu-dong-nabco-1-1024x768.jpg 1024w, https:\/\/sonha.com\/wp-content\/uploads\/2021\/05\/ray-boc-thep-cua-tu-dong-nabco-1-300x225.jpg 300w, https:\/\/sonha.com\/wp-content\/uploads\/2021\/05\/ray-boc-thep-cua-tu-dong-nabco-1-768x576.jpg 768w, https:\/\/sonha.com\/wp-content\/uploads\/2021\/05\/ray-boc-thep-cua-tu-dong-nabco-1.jpg 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption id=\"caption-attachment-19876\" class=\"wp-caption-text\"><em>Automatic door rail worn after prolonged use, causing noise and reduced performance<\/em><\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"The_sensor_operates_unstably_or_has_an_inaccurate_detection_area\"><\/span>The sensor operates unstably or has an inaccurate detection area<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The automatic door sensor detects people or objects in the doorway area and sends signals to the controller. If the sensor is dirty, the detection area has shifted, or the signal is unstable, the door&#8217;s opening and closing cycle may also be affected.<\/p>\n<p>However, it is important to distinguish between a door that actually moves slowly due to mechanical resistance, where the door leaf moves heavily, and a door that remains open for too long because the sensor continuously receives false signals or the hold-open time is set too long.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"The_safety_slow-down_mechanism_Slow_StopSafety_Delay_is_activated\"><\/span>The safety slow-down mechanism (Slow Stop\/Safety Delay) is activated<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This is an intelligent feature available on premium automatic door systems such as NABCO. When the <a href=\"https:\/\/sonha.com\/en\/what-is-an-automatic-door-safety-sensor\/\">safety sensor<\/a> (Micro-scan) detects a person or object remaining in the danger zone, or when the door repeatedly encounters a minor obstruction, the controller automatically switches the door to a slow-speed mode to ensure safety and prevent collisions.<\/p>\n<p>Users without technical experience can easily mistake this active protection feature for a mechanical failure.<\/p>\n<figure id=\"attachment_19834\" aria-describedby=\"caption-attachment-19834\" style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19834 size-full\" title=\"Automatic door safety sensor detecting a person within the operating area\" src=\"https:\/\/sonha.com\/wp-content\/uploads\/2026\/04\/cam-bien-cua-tu-dong-nabco-2.jpg\" alt=\"Motion detection sensor with directional recognition\" width=\"1200\" height=\"674\" srcset=\"https:\/\/sonha.com\/wp-content\/uploads\/2026\/04\/cam-bien-cua-tu-dong-nabco-2.jpg 1200w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/04\/cam-bien-cua-tu-dong-nabco-2-300x169.jpg 300w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/04\/cam-bien-cua-tu-dong-nabco-2-1024x575.jpg 1024w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/04\/cam-bien-cua-tu-dong-nabco-2-768x431.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption id=\"caption-attachment-19834\" class=\"wp-caption-text\"><em>Automatic door safety sensor detecting a person within the operating area<\/em><\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"How_to_perform_an_initial_check_when_an_automatic_door_opens_and_closes_slowly\"><\/span>How to perform an initial check when an automatic door opens and closes slowly<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When experiencing why an automatic door opens and closes slowly, users should not focus only on increasing the door speed. The cause should be identified before contacting a technician:<\/p>\n<ul>\n<li>Is the door slow during both opening and closing, or only in one direction?<\/li>\n<li>Has the door speed changed compared with before?<\/li>\n<li>Does the door leaf move heavily or unevenly?<\/li>\n<li>Is there dust or any obstruction around the sliding rail?<\/li>\n<li>Does the door produce unusual noises during operation?<\/li>\n<li>Does the sensor detect people consistently?<\/li>\n<li>Does the issue occur continuously or only at certain times?<\/li>\n<\/ul>\n<p>This information helps technicians narrow down the cause more quickly. Do not manually push the door leaf forcefully or open the technical housing to adjust controller parameters without the necessary expertise. Incorrect adjustments may damage the circuit board or compromise the safety of people passing through the doorway.<\/p>\n\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f21267-o2\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"21267\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/en\/wp-json\/wp\/v2\/posts\/21916#wpcf7-f21267-o2\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\">\n<div style=\"display: none;\">\n<input type=\"hidden\" name=\"_wpcf7\" value=\"21267\" \/>\n<input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.0.5\" \/>\n<input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/>\n<input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f21267-o2\" \/>\n<input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/>\n<input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/>\n<input type=\"hidden\" name=\"_extcf7_conditional_options\" value=\"{&quot;form_id&quot;:21267,&quot;conditions&quot;:[]}\" \/>\n<input type=\"hidden\" name=\"_extcf7_redirect_options\" value=\"{&quot;form_id&quot;:21267,&quot;redirect_options&quot;:{&quot;redirection_enable&quot;:&quot;off&quot;,&quot;custom_url_enable&quot;:&quot;off&quot;,&quot;redirect_page&quot;:&quot;&quot;,&quot;custom_urle&quot;:&quot;&quot;,&quot;redirect_new_tab&quot;:&quot;off&quot;,&quot;js_action&quot;:&quot;off&quot;,&quot;javascript_code&quot;:&quot;&quot;}}\" \/>\n<input type=\"hidden\" name=\"_wpcf7_recaptcha_response\" value=\"\" \/>\n<\/div>\n<div class=\"post-consult-form\">\n<div class=\"desc\">\n    Register your information to receive a free consultation on the optimal smart entrance solution for your project.\n<\/div>\n\n<div class=\"form-wrapper\">\n    <div class=\"item-full-ct\">\n        <span class=\"wpcf7-form-control-wrap\" data-name=\"your-name\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"Full name\" value=\"\" type=\"text\" name=\"your-name\" \/><\/span>\n    <\/div>\n\n    <div class=\"item-full-ct\">\n        <span class=\"wpcf7-form-control-wrap\" data-name=\"your-phone\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-tel\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Phone number *\" value=\"\" type=\"tel\" name=\"your-phone\" \/><\/span>\n    <\/div>\n\n    <div class=\"item-full-ct\">\n        <span class=\"wpcf7-form-control-wrap\" data-name=\"your-subject\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"Your issue \/ Consultation needs\" value=\"\" type=\"text\" name=\"your-subject\" \/><\/span>\n    <\/div>\n<\/div>\n\n<div><span class=\"wpcf7-form-control-wrap recaptcha\" data-name=\"recaptcha\"><span data-sitekey=\"6LecmHQrAAAAAMvkS6kCYrCEglVipgooAPjz6GM5\" class=\"wpcf7-form-control wpcf7-recaptcha g-recaptcha\"><\/span>\r\n<noscript>\r\n\t<div class=\"grecaptcha-noscript\">\r\n\t\t<iframe loading=\"lazy\" src=\"https:\/\/www.recaptcha.net\/recaptcha\/api\/fallback?k=6LecmHQrAAAAAMvkS6kCYrCEglVipgooAPjz6GM5\" frameborder=\"0\" scrolling=\"no\" width=\"310\" height=\"430\">\r\n\t\t<\/iframe>\r\n\t\t<textarea name=\"g-recaptcha-response\" rows=\"3\" cols=\"40\" placeholder=\"reCaptcha Response Here\">\r\n\t\t<\/textarea>\r\n\t<\/div>\r\n<\/noscript>\r\n<\/span><\/div>\n\n<button class=\"btn-primary\" type=\"submit\">Send<\/button>\n<\/div><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n\n<h2><span class=\"ez-toc-section\" id=\"When_does_an_automatic_door_system_need_maintenance_or_upgrading\"><\/span>When does an automatic door system need maintenance or upgrading?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If the door is only slightly slow due to dust on the rail or sensor, a technician may only need to clean the system, apply specialized grease, and readjust the settings to restore smooth operation.<\/p>\n<p>On the other hand, if the door has been in use for a long time and simultaneously shows multiple signs such as slow opening and closing, uneven movement, unusual noise, or worn mechanical components, the entire system should be inspected to determine whether maintenance or replacement is required.<\/p>\n<p>This is particularly important in office buildings, shopping malls, hospitals, and facilities with high pedestrian traffic, where addressing abnormal signs early can help prevent operational disruptions or fire safety incidents.<\/p>\n<figure id=\"attachment_20346\" aria-describedby=\"caption-attachment-20346\" style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-20346 size-full\" title=\"B\u1ea3o tr\u00ec motor v\u00e0 b\u1ed9 \u0111i\u1ec1u khi\u1ec3n c\u1eeda t\u1ef1 \u0111\u1ed9ng gi\u00fap ph\u00e1t hi\u1ec7n s\u1edbm c\u00e1c d\u1ea5u hi\u1ec7u hao m\u00f2n\" src=\"https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/kiem-tra-bao-tri-cua-tu-dong-mua-mua-bao.jpg\" alt=\"B\u1ea3o tr\u00ec motor v\u00e0 b\u1ed9 \u0111i\u1ec1u khi\u1ec3n c\u1eeda t\u1ef1 \u0111\u1ed9ng gi\u00fap ph\u00e1t hi\u1ec7n s\u1edbm c\u00e1c d\u1ea5u hi\u1ec7u hao m\u00f2n\" width=\"1200\" height=\"674\" srcset=\"https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/kiem-tra-bao-tri-cua-tu-dong-mua-mua-bao.jpg 1200w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/kiem-tra-bao-tri-cua-tu-dong-mua-mua-bao-300x169.jpg 300w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/kiem-tra-bao-tri-cua-tu-dong-mua-mua-bao-1024x575.jpg 1024w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/06\/kiem-tra-bao-tri-cua-tu-dong-mua-mua-bao-768x431.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption id=\"caption-attachment-20346\" class=\"wp-caption-text\"><em>Maintenance of the automatic door motor and controller helps detect early signs of wear<\/em><\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"NABCO_automatic_doors_%E2%80%93_A_durable_solution_for_high-frequency_operation\"><\/span>NABCO automatic doors &#8211; A durable solution for high-frequency operation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For buildings where automatic doors need to operate frequently, selecting the equipment brand from the initial stage is a key factor in minimizing the risk of reduced door speed or premature deterioration after a period of use.<\/p>\n<p>NABCO is a Japanese automatic door brand known for high mechanical durability, smooth CAN-bus communication technology, and strong load-bearing capability. NABCO develops various automatic door models for different building types and usage requirements. Among them, the <a href=\"https:\/\/sonha.com\/en\/san-pham\/v-150sl-automatic-sliding-door\/\">NABCO V-150SL-HM<\/a> is a heavy-duty automatic sliding door designed for entrances of large buildings, with the ability to operate door leaves weighing up to 120 kg. This version uses an approximately 100 mm-high operator housing, giving the top of the door a more compact design.<\/p>\n<figure id=\"attachment_21898\" aria-describedby=\"caption-attachment-21898\" style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-21898 size-full\" title=\"C\u1eeda tr\u01b0\u1ee3t t\u1ef1 \u0111\u1ed9ng NABCO V-150SL-HM cho t\u00f2a nh\u00e0 v\u0103n ph\u00f2ng PVI Tower\" src=\"https:\/\/sonha.com\/wp-content\/uploads\/2026\/09\/cua-tu-dong-tai-pvi-tower-3.jpg\" alt=\"C\u1eeda tr\u01b0\u1ee3t t\u1ef1 \u0111\u1ed9ng NABCO V-150SL-HM cho t\u00f2a nh\u00e0 v\u0103n ph\u00f2ng PVI Tower\" width=\"1200\" height=\"674\" srcset=\"https:\/\/sonha.com\/wp-content\/uploads\/2026\/09\/cua-tu-dong-tai-pvi-tower-3.jpg 1200w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/09\/cua-tu-dong-tai-pvi-tower-3-300x169.jpg 300w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/09\/cua-tu-dong-tai-pvi-tower-3-1024x575.jpg 1024w, https:\/\/sonha.com\/wp-content\/uploads\/2026\/09\/cua-tu-dong-tai-pvi-tower-3-768x431.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption id=\"caption-attachment-21898\" class=\"wp-caption-text\"><em>NABCO V-150SL-HM automatic sliding doors for PVI Tower office building<\/em><\/figcaption><\/figure>\n<p>In addition to standard automatic sliding door models, NABCO also offers the GT-1175 with a Breakout emergency opening mechanism. In daily operation, the door functions as an automatic sliding door system. When an emergency egress route needs to be created or the passageway needs to be widened in special situations, the door leaves and side screens can be opened to a 90\u00b0 angle like hinged doors. For the GT-1175BO-FO version, this mechanism is activated with a pushing force of 110N.<\/p>\n<p><a href=\"https:\/\/sonha.com\/en\/san-pham\/nabco-gt-1175-automatic-sliding-door-with-breakout-function\/\">The NABCO GT-1175<\/a> is suitable for buildings with high pedestrian traffic where emergency egress or the need to widen the passageway in special situations must be taken into consideration. This door series offers multiple configurations, including two-panel and single-panel sliding doors, as well as different design versions to meet specific entrance requirements.<\/p>\n<p>Therefore, when an automatic door opens and closes slowly, troubleshooting should not focus solely on increasing the door speed. For an existing system, the cause should first be identified to determine whether cleaning, adjustment, maintenance, or replacement is the appropriate solution. For new installations, selecting the model based on door load, usage frequency, and operating requirements from the outset can also help minimize problems during operation.<\/p>\n<p><iframe loading=\"lazy\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/9h-R6biwGn0?si=cm8N6b6E1Ukrq7Tn\" width=\"800\" height=\"600\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><\/iframe><\/p>\n<p style=\"text-align: center;\"><em>The NABCO GT-1175 sliding door with Breakout emergency opening mechanism<\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Sonha_Auto_%E2%80%93_Professional_automatic_door_consultation_maintenance_and_repair_services\"><\/span>Sonha Auto &#8211; Professional automatic door consultation, maintenance, and repair services<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If your building&#8217;s automatic door system is experiencing slow opening and closing, unstable operation, or requires upgrading, Sonha Auto is ready to provide support.<\/p>\n<p>As the official distributor of NABCO in Vietnam, Sonha Auto provides a comprehensive service process: Site survey &#8211; Accurate diagnosis of the cause &#8211; Optimal solution proposal &#8211; Maintenance\/replacement with genuine equipment.<\/p>\n<p>Contact Sonha Auto now to receive consultation and an on-site survey from our technical team!<\/p>\n<p style=\"text-align: center; margin: 40px 0;\"><a style=\"display: inline-block; background: #d71920; color: #ffffff; padding: 18px 42px; border-radius: 8px; font-size: 20px; font-weight: bold; text-decoration: none; font-family: inherit;\" href=\"#\">WARRANTY &amp; MAINTENANCE SERVICES HOTLINE: 0934 546 008<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why does an automatic door open and close slowly? This is one of the most common automatic door problems after a period of use, particularly in areas with high opening and closing frequency. The door may move slowly from the beginning of the opening cycle, take longer to close, or no longer operate at a [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":21917,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[202,200],"tags":[],"class_list":["post-21916","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-professional-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/posts\/21916","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/comments?post=21916"}],"version-history":[{"count":1,"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/posts\/21916\/revisions"}],"predecessor-version":[{"id":21919,"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/posts\/21916\/revisions\/21919"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/media\/21917"}],"wp:attachment":[{"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/media?parent=21916"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/categories?post=21916"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sonha.com\/en\/wp-json\/wp\/v2\/tags?post=21916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}