{"id":115,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/fan-defects\/"},"modified":"2026-05-23T22:42:58","modified_gmt":"2026-05-23T22:42:58","slug":"fan-defects","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/yo\/glossary\/fan-defects\/","title":{"rendered":"What are Fan Defects? Common Failures and Diagnosis"},"content":{"rendered":"<h1>Understanding Fan Defects<\/h1>\n\t\t<section class=\"woocommerce hestia-shop products is-shortcode\" id=\"products\" data-sorder=\"hestia_shop\" >\n\t\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<div class=\"hestia-shop-content\">\n\t\t\t<div class=\"row\" data-aos=\"fade-up\" >\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/balanset-1\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer Balanset-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A full kit portable balancer and vibration analyzer\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/yo\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/yo\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer Balanset-1A\">Portable balancer &#038; Vibration analyzer Balanset-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,975.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/yo\/wp-json\/wp\/v2\/glossary\/115?add-to-cart=986\" data-quantity=\"1\" data-product_id=\"986\" data-product_sku=\"BS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/yo\/wp-json\/wp\/v2\/glossary\/115?add-to-cart=986\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_986\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"986\" data-product_sku=\"BS-1\" aria-label=\"Add to cart: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_986\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/vibration-sensor\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/vibration-sensor\/\" title=\"Vibration sensor\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A vibration sensor close-up\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/yo\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/yo\/product\/vibration-sensor\/\" title=\"Vibration sensor\">Vibration sensor<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>90.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/yo\/wp-json\/wp\/v2\/glossary\/115?add-to-cart=1820\" data-quantity=\"1\" data-product_id=\"1820\" data-product_sku=\"VS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/yo\/wp-json\/wp\/v2\/glossary\/115?add-to-cart=1820\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1820\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1820\" data-product_sku=\"VS-1\" aria-label=\"Add to cart: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1820\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/optical-sensor-for-balanset-and-arbalance\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Optical Sensor (Laser Tachometer)\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1536x1023.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU.webp 1600w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/yo\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/yo\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">Optical Sensor (Laser Tachometer)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>124.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/yo\/wp-json\/wp\/v2\/glossary\/115?add-to-cart=1832\" data-quantity=\"1\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/yo\/wp-json\/wp\/v2\/glossary\/115?add-to-cart=1832\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1832\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" aria-label=\"Add to cart: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1832\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/balanset-4\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/balanset-4\/\" title=\"Balanset-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Vibromera rotor balancing kit: carry case, multi-channel signal conditioner, handheld analyzer, magnetic base, vibration sensors, and coiled cables.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4.webp 640w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/yo\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/yo\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>6,803.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/yo\/wp-json\/wp\/v2\/glossary\/115?add-to-cart=1833\" data-quantity=\"1\" data-product_id=\"1833\" data-product_sku=\"BS-4\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/yo\/wp-json\/wp\/v2\/glossary\/115?add-to-cart=1833\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1833\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1833\" data-product_sku=\"BS-4\" aria-label=\"Add to cart: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1833\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div><!-- \/.row --><div class=\"row\">\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/magnet-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/yo\/product\/magnet-stand\/\" title=\"Magnetic Stand Insize-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Magnet base.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/yo\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a 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class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/yo\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamic balancer \u201cBalanset-1A\u201d OEM\">Dynamic balancer \u201cBalanset-1A\u201d OEM<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,735.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/yo\/wp-json\/wp\/v2\/glossary\/115?add-to-cart=4193\" data-quantity=\"1\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" 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class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\n<p><strong>Fan defects<\/strong> are the faults that develop in industrial fans and blowers: blade damage such as cracks, erosion and material build-up; <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/unbalance\/\">unbalance<\/a> caused by material loss or accumulation; aerodynamic instabilities like stall and surge; structural problems such as loose blades and cracked hubs; and the bearing and drive failures common to all rotating equipment. Each leaves a characteristic <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/vibration\/\">vibration<\/a> signature, typically dominated by the <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/blade-passing-frequency\/\">blade passing frequency<\/a> and its harmonics, alongside 1\u00d7 unbalance vibration and low-frequency aerodynamic pulsations. Because fans are everywhere in industry \u2014 HVAC, process cooling, combustion air, material handling \u2014 their failures reach into production, safety (ventilation) and energy efficiency, which makes recognising fan-specific defects and the techniques used to monitor them a core reliability skill.<\/p>\n<h2>1. Definition: What are Fan Defects?<\/h2>\n<p>A fan is a deceptively simple machine \u2014 a bladed wheel on a shaft \u2014 yet it sits at the intersection of two worlds. Like every <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/rotor\/\">rotor<\/a> it suffers mechanical ailments such as unbalance, bearing wear and looseness; but it also moves a fluid, so it is subject to <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/aerodynamic-forces\/\">aerodynamic forces<\/a> that no purely mechanical machine experiences. The art of fan diagnosis lies in telling the two apart in the spectrum, because the remedy for a mechanical fault (balance, replace, tighten) is completely different from the remedy for an aerodynamic one (change the operating point or the ductwork). Catching defects early also matters more than usual: a liberated blade or a failed hub on a large fan can be genuinely catastrophic.<\/p>\n<h2>2. Common Fan Defects<\/h2>\n<h3>2.1 Blade damage and erosion<\/h3>\n<h4>Material build-up<\/h4>\n<ul>\n<li><strong>Cause:<\/strong> dust, scale or process material accumulating on the blades.<\/li>\n<li><strong>Effect:<\/strong> creates mass unbalance and alters the aerodynamics.<\/li>\n<li><strong>Symptom:<\/strong> a gradually rising 1\u00d7 vibration over time.<\/li>\n<li><strong>Common in:<\/strong> material-handling and process-exhaust fans.<\/li>\n<li><strong>Solution:<\/strong> periodic cleaning and upstream filtration.<\/li>\n<\/ul>\n<h4>Erosion and wear<\/h4>\n<ul>\n<li><strong>Cause:<\/strong> abrasive particles wearing away the blade surfaces.<\/li>\n<li><strong>Effect:<\/strong> material loss creating unbalance and degrading performance.<\/li>\n<li><strong>Pattern:<\/strong> usually asymmetric, with the leading edge eroding faster than the trailing edge.<\/li>\n<li><strong>Detection:<\/strong> rising 1\u00d7 vibration and reduced output.<\/li>\n<\/ul>\n<h4>Corrosion<\/h4>\n<ul>\n<li>Chemical attack on the blade material.<\/li>\n<li>Produces pitting and material loss.<\/li>\n<li>Reduces blade strength.<\/li>\n<li>Can progress to cracks and ultimately blade failure.<\/li>\n<\/ul>\n<h4>Blade cracks<\/h4>\n<ul>\n<li><strong>Locations:<\/strong> the blade root (hub attachment), the leading edge, and weld joints.<\/li>\n<li><strong>Causes:<\/strong> <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/fatigue\/\">fatigue<\/a>, corrosion, impact and vibration.<\/li>\n<li><strong>Symptoms:<\/strong> a changing vibration pattern, sometimes a growing 2\u00d7 component.<\/li>\n<li><strong>Danger:<\/strong> can lead to complete blade separation.<\/li>\n<\/ul>\n<h4>Missing or broken blades<\/h4>\n<ul>\n<li>Severe unbalance from the now-asymmetric blade arrangement.<\/li>\n<li>Very high 1\u00d7 vibration.<\/li>\n<li>An abnormal blade-passing-frequency pattern.<\/li>\n<li>Immediate <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/shutdown\/\">shutdown<\/a> and repair required.<\/li>\n<\/ul>\n<h3>2.2 Unbalance<\/h3>\n<p>The most common fan vibration problem by far:<\/p>\n<ul>\n<li><strong>Sources:<\/strong> build-up, erosion, manufacturing tolerances and blade damage.<\/li>\n<li><strong>Signature:<\/strong> 1\u00d7 <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/synchronous-vibration\/\">synchronous<\/a> vibration.<\/li>\n<li><strong>Correction:<\/strong> <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/field-balancing\/\">field balancing<\/a> is usually effective.<\/li>\n<li><strong>Recurring:<\/strong> if it keeps coming back, the root cause (erosion or a build-up source) must be tackled, not just the symptom.<\/li>\n<\/ul>\n<h3>2.3 Aerodynamic instabilities<\/h3>\n<h4>Stall<\/h4>\n<ul>\n<li>Airflow separates from the blade surfaces at off-design conditions.<\/li>\n<li>Random, turbulent flow generating broadband vibration.<\/li>\n<li>Reduced efficiency and performance.<\/li>\n<li>Common at low flow rates or high inlet resistance.<\/li>\n<\/ul>\n<h4>Surge<\/h4>\n<ul>\n<li>Periodic flow reversal across the whole system.<\/li>\n<li>Very low frequency (below 5 Hz) but severe pulsations.<\/li>\n<li>Can damage the fan and the ductwork.<\/li>\n<li>Usually requires system modifications to eliminate.<\/li>\n<\/ul>\n<h3>2.4 Structural and mechanical issues<\/h3>\n<ul>\n<li><strong>Loose blades:<\/strong> failed set screws or welds, producing multiple harmonics.<\/li>\n<li><strong>Cracked hub:<\/strong> failure of the hub structure \u2014 potentially catastrophic.<\/li>\n<li><strong>Worn shaft:<\/strong> lets the fan wheel shift, creating <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/run-out\/\">runout<\/a>.<\/li>\n<li><strong>Housing resonance:<\/strong> the casing or ductwork resonating at the BPF or one of its harmonics, a form of <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/structural-resonance\/\">structural resonance<\/a>.<\/li>\n<\/ul>\n<h3>2.5 Drive and bearing problems<\/h3>\n<ul>\n<li>Belt-drive issues \u2014 wear, <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/misalignment\/\">misalignment<\/a>, incorrect tension.<\/li>\n<li><a href=\"https:\/\/vibromera.eu\/yo\/glossary\/bearing-defects\/\">Bearing failures<\/a>, especially common in dirty or hot environments.<\/li>\n<li>Coupling problems such as misalignment and wear.<\/li>\n<li>Motor defects that disturb fan operation.<\/li>\n<\/ul>\n<h2>3. Vibration Characteristics<\/h2>\n<h3>Blade passing frequency (BPF)<\/h3>\n<p>The key fan-specific frequency:<\/p>\n<ul>\n<li><strong>Calculation:<\/strong> BPF = number of blades \u00d7 RPM \/ 60.<\/li>\n<li><strong>Example:<\/strong> a 12-blade fan at 1,200 RPM gives a BPF of 240 Hz.<\/li>\n<li><strong>Normal amplitude:<\/strong> depends on fan type \u2014 axial fans run higher than centrifugal ones.<\/li>\n<li><strong>Elevated BPF:<\/strong> points to blade damage, clearance problems or aerodynamic issues.<\/li>\n<li><strong>Harmonics:<\/strong> 2\u00d7BPF and 3\u00d7BPF indicate blade problems or resonances.<\/li>\n<\/ul>\n<p>The arithmetic is quick to do by hand, but a dedicated <a href=\"https:\/\/vibromera.eu\/yo\/calculators\/blade-pass-frequency\/\">blade pass frequency calculator<\/a> removes any doubt about which spectral peak is the BPF and which is a coincidental <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/harmonics\/\">harmonic<\/a> of running speed.<\/p>\n<h3>Unbalance (1\u00d7)<\/h3>\n<ul>\n<li>The most common high-amplitude component.<\/li>\n<li>Rises with build-up or erosion.<\/li>\n<li>Correctable by balancing.<\/li>\n<li>May recur if the root cause is left unaddressed.<\/li>\n<\/ul>\n<h3>Aerodynamic pulsations<\/h3>\n<ul>\n<li><strong>Stall:<\/strong> a broadband increase with random fluctuations.<\/li>\n<li><strong>Surge:<\/strong> severe 1\u20135 Hz pulsations.<\/li>\n<li><strong>Turbulence:<\/strong> broadband and low-frequency, roughly 10\u2013100 Hz \u2014 see <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/flow-turbulence\/\">flow turbulence<\/a>.<\/li>\n<\/ul>\n<h2>4. Fan-Specific Considerations<\/h2>\n<h3>Fan types and their defect patterns<\/h3>\n<h4>Centrifugal fans<\/h4>\n<ul>\n<li>Unbalance is the most common issue.<\/li>\n<li>BPF is typically of moderate amplitude.<\/li>\n<li>Build-up on backward-curved blades is common.<\/li>\n<li>Seal and bearing problems arise from process contamination.<\/li>\n<\/ul>\n<h4>Axial fans<\/h4>\n<ul>\n<li>Higher BPF amplitudes are normal \u2014 see <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/axial-fan-defects\/\">axial fan defects<\/a> for the detail.<\/li>\n<li>Blade-tip clearance is critical.<\/li>\n<li>Aerodynamic instabilities are more common.<\/li>\n<li>Blade fatigue results from alternating aerodynamic loads, sometimes aggravated by <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/blade-resonance\/\">blade resonance<\/a>.<\/li>\n<\/ul>\n<h4>Induced-draught (ID) fans<\/h4>\n<ul>\n<li>Severe erosion from flyash and particulates.<\/li>\n<li>High temperatures that affect material properties.<\/li>\n<li>Corrosive operating environments.<\/li>\n<li>Frequent rebalancing required as a result.<\/li>\n<\/ul>\n<h2>5. Diagnostic Strategy<\/h2>\n<h3>Initial assessment<\/h3>\n<ol>\n<li>Measure overall vibration at the bearings.<\/li>\n<li>Run an <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/fft\/\">FFT<\/a> analysis to identify the dominant frequencies.<\/li>\n<li>Check for 1\u00d7 (unbalance), BPF (blade issues) and <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/bearing-fault-frequencies\/\">bearing fault frequencies<\/a>.<\/li>\n<li>Assess performance \u2014 flow and pressure.<\/li>\n<li>Inspect visually if the fan is accessible.<\/li>\n<\/ol>\n<h3>Problem identification<\/h3>\n<ul>\n<li><strong>High 1\u00d7:<\/strong> unbalance \u2014 balance or clean the fan.<\/li>\n<li><strong>High BPF:<\/strong> blade damage or clearance issues \u2014 inspect the blades.<\/li>\n<li><strong>Broadband:<\/strong> <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/cavitation\/\">cavitation<\/a> or stall \u2014 check the operating point.<\/li>\n<li><strong>Low frequency:<\/strong> surge or <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/recirculation\/\">recirculation<\/a> \u2014 modify the system.<\/li>\n<li><strong>Bearing frequencies:<\/strong> bearing wear \u2014 replace the bearings.<\/li>\n<\/ul>\n<h2>6. Prevention, Maintenance and Field Correction<\/h2>\n<h3>Balancing<\/h3>\n<ul>\n<li>Field-balance fan wheels in situ rather than removing them.<\/li>\n<li>Rebalance after any cleaning or blade repair.<\/li>\n<li>Use clip-on or bolt-on <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/correction-weight\/\">correction weights<\/a> for adjustability.<\/li>\n<li>Document the balance weights for future reference.<\/li>\n<\/ul>\n<p>Because most fans run in their own bearings with no balancing machine on site, this is precisely the job a portable two-channel analyser is built for. The <a href=\"https:\/\/vibromera.eu\/yo\/product\/balanset-1\/\">Balanset-1A<\/a> measures the 1\u00d7 <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/phase\/\">amplitude and phase<\/a> at operating speed, computes the <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/influence-coefficient\/\">influence coefficients<\/a> from a trial run, and tells the technician the mass and angle of weight to add \u2014 then verifies the <a href=\"https:\/\/vibromera.eu\/yo\/glossary\/residual-unbalance\/\">residual unbalance<\/a> after correction, all without dismantling the fan.<\/p>\n<h3>Inspection and cleaning<\/h3>\n<ul>\n<li>Inspect periodically for build-up, erosion and damage.<\/li>\n<li>Clean the blades during outages.<\/li>\n<li>Check the security of blade attachments.<\/li>\n<li>Look for cracks, especially at the blade roots.<\/li>\n<\/ul>\n<h3>Operating practices<\/h3>\n<ul>\n<li>Operate near the design point whenever possible.<\/li>\n<li>Avoid prolonged running at the extremes of very high or very low flow.<\/li>\n<li>Control inlet conditions to minimise turbulence.<\/li>\n<li>Apply protective coatings for erosive or corrosive service.<\/li>\n<\/ul>\n<p>Fan defects combine the mechanical problems shared by all rotating equipment with the aerodynamic issues unique to air-moving machines. The blade-passing-frequency signature, read alongside standard vibration-analysis techniques, makes effective fan condition monitoring possible and guides sound maintenance decisions for these critical machines.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/yo\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about fan defects including blade damage, unbalance, aerodynamic instabilities, and resonance, detectable through vibration analysis at blade passing frequency.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,110],"tags":[],"class_list":["post-115","glossary","type-glossary","status-publish","hentry","category-glossary","category-vibration-diagnostics"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/yo\/wp-json\/wp\/v2\/glossary\/115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/yo\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/yo\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/yo\/wp-json\/wp\/v2\/glossary\/115\/revisions"}],"predecessor-version":[{"id":101333,"href":"https:\/\/vibromera.eu\/yo\/wp-json\/wp\/v2\/glossary\/115\/revisions\/101333"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/yo\/wp-json\/wp\/v2\/media?parent=115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/yo\/wp-json\/wp\/v2\/categories?post=115"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/yo\/wp-json\/wp\/v2\/tags?post=115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}