{"id":11538,"date":"2026-06-02T09:25:06","date_gmt":"2026-06-02T09:25:06","guid":{"rendered":"https:\/\/www.kscranegroup.com\/?post_type=posts&#038;p=11538"},"modified":"2026-06-02T09:25:13","modified_gmt":"2026-06-02T09:25:13","slug":"overhead-crane-electrical-system-failures-causes-troubleshooting-repair-guide","status":"publish","type":"posts","link":"https:\/\/www.kscranegroup.com\/vi\/posts\/overhead-crane-electrical-system-failures-causes-troubleshooting-repair-guide\/","title":{"rendered":"C\u00e1c s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao: Nguy\u00ean nh\u00e2n, kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 v\u00e0 h\u01b0\u1edbng d\u1eabn s\u1eeda ch\u1eefa."},"content":{"rendered":"<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><p>M\u1ee5c l\u1ee5c<\/p><nav><ul><li><a href=\"#part-1-common-types-of-overhead-crane-electrical-system-failures\">Ph\u1ea7n 1: C\u00e1c lo\u1ea1i s\u1ef1 c\u1ed1 th\u01b0\u1eddng g\u1eb7p trong h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao<\/a><ul><li><a href=\"#1-ac-motor-failures\">1. H\u1ecfng h\u00f3c \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n xoay chi\u1ec1u<\/a><\/li><li><a href=\"#2-ac-electromagnet-failures\">2. H\u1ecfng h\u00f3c nam ch\u00e2m \u0111i\u1ec7n xoay chi\u1ec1u<\/a><\/li><li><a href=\"#3-ac-contactor-and-relay-failures\">3. H\u1ecfng c\u00f4ng t\u1eafc t\u01a1 v\u00e0 r\u01a1le AC<\/a><\/li><li><a href=\"#4-hydraulic-electromagnet-thruster-failures\">4. H\u1ecfng h\u00f3c nam ch\u00e2m \u0111i\u1ec7n th\u1ee7y l\u1ef1c (\u0111\u1ed9ng c\u01a1 \u0111\u1ea9y)<\/a><\/li><\/ul><\/li><li><a href=\"#part-2-control-and-circuit-system-failures\">Ph\u1ea7n 2: C\u00e1c l\u1ed7i h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 m\u1ea1ch \u0111i\u1ec7n<\/a><ul><li><a href=\"#1-protection-box-knife-switch-closed-\u2192-control-circuit-fuse-blows\">1. C\u00f4ng t\u1eafc dao trong h\u1ed9p b\u1ea3o v\u1ec7 \u0111\u00f3ng \u2192 C\u1ea7u ch\u00ec m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n b\u1ecb \u0111\u1ee9t<\/a><\/li><li><a href=\"#2-over-current-relay-trips-when-controller-engaged\">2. R\u01a1le qu\u00e1 d\u00f2ng ng\u1eaft khi b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t<\/a><\/li><li><a href=\"#3-main-contactor-engages-\u2192-incoming-line-fuse-blows\">3. C\u00f4ng t\u1eafc t\u01a1 ch\u00ednh \u0111\u00f3ng \u2192 C\u1ea7u ch\u00ec \u0111\u01b0\u1eddng d\u00e2y v\u00e0o b\u1ecb \u0111\u1ee9t<\/a><\/li><li><a href=\"#4-controller-engaged-but-motor-doesnt-rotate\">4. B\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u00e3 \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t nh\u01b0ng \u0111\u1ed9ng c\u01a1 kh\u00f4ng quay.<\/a><\/li><li><a href=\"#5-controller-engaged-\u2192-motor-runs-in-one-direction-only\">5. B\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t \u2192 \u0110\u1ed9ng c\u01a1 ch\u1ec9 ch\u1ea1y theo m\u1ed9t h\u01b0\u1edbng.<\/a><\/li><li><a href=\"#6-limit-switch-activated-\u2192-main-contactor-wont-release\">6. C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t \u2192 C\u00f4ng t\u1eafc t\u01a1 ch\u00ednh kh\u00f4ng nh\u1ea3<\/a><\/li><li><a href=\"#7-controller-returned-to-off-\u2192-main-contactor-wont-release\">7. B\u1ed9 \u0111i\u1ec1u khi\u1ec3n tr\u1edf v\u1ec1 v\u1ecb tr\u00ed T\u1eaft \u2192 C\u00f4ng t\u1eafc t\u01a1 ch\u00ednh kh\u00f4ng nh\u1ea3<\/a><\/li><li><a href=\"#8-controller-handle-jammed-during-operation\">8. Tay c\u1ea7m \u0111i\u1ec1u khi\u1ec3n b\u1ecb k\u1eb9t trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh<\/a><\/li><li><a href=\"#9-generator-fails-to-excite-for-crane-with-onboard-generator-set\">9. M\u00e1y ph\u00e1t \u0111i\u1ec7n kh\u00f4ng kh\u1edfi \u0111\u1ed9ng (\u0111\u1ed1i v\u1edbi c\u1ea7n c\u1ea9u c\u00f3 m\u00e1y ph\u00e1t \u0111i\u1ec7n t\u00edch h\u1ee3p)<\/a><\/li><li><a href=\"#10-power-cut-but-protection-box-contactor-wont-drop-out-control-circuit-de-energized\">10. M\u1ea5t \u0111i\u1ec7n nh\u01b0ng c\u00f4ng t\u1eafc t\u01a1 h\u1ed9p b\u1ea3o v\u1ec7 kh\u00f4ng ng\u1eaft (M\u1ea1ch \u0111i\u1ec1u khi\u1ec3n b\u1ecb ng\u1eaft \u0111i\u1ec7n)<\/a><\/li><\/ul><\/li><li><a href=\"#quick-diagnostic-flow-for-overhead-crane-electrical-problems\">Quy tr\u00ecnh ch\u1ea9n \u0111o\u00e1n nhanh c\u00e1c s\u1ef1 c\u1ed1 \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao<\/a><\/li><li><a href=\"#replace-vs-repair-guide-for-crane-electrical-components\">H\u01b0\u1edbng d\u1eabn thay th\u1ebf so v\u1edbi s\u1eeda ch\u1eefa c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u<\/a><\/li><li><a href=\"#preventive-maintenance-for-overhead-crane-electrical-systems\">B\u1ea3o tr\u00ec ph\u00f2ng ng\u1eeba cho h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao<\/a><ul><li><a href=\"#inspect-electrical-connections-regularly\">Ki\u1ec3m tra c\u00e1c m\u1ed1i n\u1ed1i \u0111i\u1ec7n th\u01b0\u1eddng xuy\u00ean.<\/a><\/li><li><a href=\"#monitor-motor-temperature\">Theo d\u00f5i nhi\u1ec7t \u0111\u1ed9 \u0111\u1ed9ng c\u01a1<\/a><\/li><li><a href=\"#check-contactors-and-relays\">Ki\u1ec3m tra c\u00e1c c\u00f4ng t\u1eafc t\u01a1 v\u00e0 r\u01a1le.<\/a><\/li><li><a href=\"#test-limit-switches-and-safety-devices\">Ki\u1ec3m tra c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 thi\u1ebft b\u1ecb an to\u00e0n<\/a><\/li><li><a href=\"#follow-scheduled-electrical-inspections\">Tu\u00e2n th\u1ee7 l\u1ecbch ki\u1ec3m tra \u0111i\u1ec7n \u0111\u1ecbnh k\u1ef3.<\/a><\/li><\/ul><\/li><li><a href=\"#need-expert-support-for-overhead-crane-electrical-system-failures\">C\u1ea7n h\u1ed7 tr\u1ee3 chuy\u00ean gia khi x\u1ea3y ra s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n tr\u00ean c\u1ea7n c\u1ea9u tr\u1ee5c?<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<p>H\u1ecfng h\u00f3c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao l\u00e0 m\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n h\u00e0ng \u0111\u1ea7u g\u00e2y ra th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u1ea7n c\u1ea9u trong c\u00e1c nh\u00e0 m\u00e1y s\u1ea3n xu\u1ea5t, nh\u00e0 kho, nh\u00e0 m\u00e1y th\u00e9p v\u00e0 c\u00e1c c\u01a1 s\u1edf c\u00f4ng nghi\u1ec7p n\u1eb7ng. So v\u1edbi c\u00e1c l\u1ed7i c\u01a1 kh\u00ed, l\u1ed7i \u0111i\u1ec7n th\u01b0\u1eddng kh\u00f3 ch\u1ea9n \u0111o\u00e1n h\u01a1n v\u00ec c\u00e1c tri\u1ec7u ch\u1ee9ng c\u00f3 th\u1ec3 g\u00e2y nh\u1ea7m l\u1eabn.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5, \u0111\u1ed9ng c\u01a1 kh\u00f4ng kh\u1edfi \u0111\u1ed9ng \u0111\u01b0\u1ee3c c\u00f3 th\u1ec3 do b\u1ed9 ti\u1ebfp \u0111i\u1ec3m b\u1ecb ch\u00e1y, c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n b\u1ecb l\u1ed7i, c\u1ea7u ch\u00ec b\u1ecb \u0111\u1ee9t, \u0111i\u1ec7n \u00e1p ngu\u1ed3n th\u1ea5p ho\u1eb7c \u0111\u01a1n gi\u1ea3n l\u00e0 do k\u1ebft n\u1ed1i \u0111i\u1ec7n b\u1ecb l\u1ecfng. T\u01b0\u01a1ng t\u1ef1, hi\u1ec7n t\u01b0\u1ee3ng qu\u00e1 nhi\u1ec7t, rung \u0111\u1ed9ng b\u1ea5t th\u01b0\u1eddng, tia l\u1eeda \u0111i\u1ec7n v\u00e0 t\u1eaft m\u00e1y kh\u00f4ng li\u00ean t\u1ee5c th\u01b0\u1eddng cho th\u1ea5y nh\u1eefng v\u1ea5n \u0111\u1ec1 nghi\u00eam tr\u1ecdng h\u01a1n b\u00ean trong h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u.<\/p>\n\n\n\n<p>Ph\u1ed5 bi\u1ebfn nh\u1ea5t <a href=\"https:\/\/www.kscranegroup.com\/vi\/overhead-cranes\/\">c\u1ea7n c\u1ea9u tr\u00ean cao<\/a> C\u00e1c s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n bao g\u1ed3m \u0111\u1ed9ng c\u01a1 qu\u00e1 n\u00f3ng, h\u01b0 h\u1ecfng c\u00f4ng t\u1eafc t\u01a1 v\u00e0 r\u01a1le, l\u1ed7i nam ch\u00e2m \u0111i\u1ec7n, l\u1ed7i m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n, tr\u1ee5c tr\u1eb7c c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 s\u1ef1 c\u1ed1 ngu\u1ed3n \u0111i\u1ec7n.<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y gi\u1ea3i th\u00edch c\u00e1ch x\u00e1c \u0111\u1ecbnh, kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 v\u00e0 s\u1eeda ch\u1eefa c\u00e1c l\u1ed7i h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p ch\u1ea9n \u0111o\u00e1n c\u00f3 h\u1ec7 th\u1ed1ng \u2014 t\u1eeb ki\u1ec3m tra \u1edf c\u1ea5p \u0111\u1ed9 linh ki\u1ec7n \u0111\u1ebfn ph\u00e2n t\u00edch m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n ho\u00e0n ch\u1ec9nh.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1920\" src=\"https:\/\/www.kscranegroup.com\/wp-content\/uploads\/2026\/06\/1Overhead-Crane-Electrical-System-Failures-Motor-scaled.jpg\" alt=\"\" class=\"wp-image-11539\" srcset=\"https:\/\/www.kscranegroup.com\/wp-content\/uploads\/2026\/06\/1Overhead-Crane-Electrical-System-Failures-Motor-scaled.jpg 2560w, https:\/\/www.kscranegroup.com\/wp-content\/uploads\/2026\/06\/1Overhead-Crane-Electrical-System-Failures-Motor-1536x1152.jpg 1536w, https:\/\/www.kscranegroup.com\/wp-content\/uploads\/2026\/06\/1Overhead-Crane-Electrical-System-Failures-Motor-2048x1536.jpg 2048w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"part-1-common-types-of-overhead-crane-electrical-system-failures\">Ph\u1ea7n 1: C\u00e1c lo\u1ea1i s\u1ef1 c\u1ed1 th\u01b0\u1eddng g\u1eb7p trong h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-ac-motor-failures\">1. H\u1ecfng h\u00f3c \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n xoay chi\u1ec1u<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-1-entire-motor-evenly-overheating\">1.1 To\u00e0n b\u1ed9 \u0111\u1ed9ng c\u01a1 b\u1ecb qu\u00e1 nhi\u1ec7t \u0111\u1ec1u<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Chu k\u1ef3 l\u00e0m vi\u1ec7c (JC%) t\u0103ng l\u00ean g\u00e2y qu\u00e1 t\u1ea3i<\/td><td>Gi\u1ea3m c\u01b0\u1eddng \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u1ea7n c\u1ea9u ho\u1eb7c thay th\u1ebf b\u1eb1ng \u0111\u1ed9ng c\u01a1 c\u00f3 c\u00f4ng su\u1ea5t ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u th\u1ef1c t\u1ebf c\u1ee7a JC%.<\/td><\/tr><tr><td>Ho\u1ea1t \u0111\u1ed9ng \u1edf \u0111i\u1ec7n \u00e1p th\u1ea5p<\/td><td>Ng\u1eebng ho\u1ea1t \u0111\u1ed9ng n\u1ebfu \u0111i\u1ec7n \u00e1p gi\u1ea3m xu\u1ed1ng d\u01b0\u1edbi 10% so v\u1edbi gi\u00e1 tr\u1ecb \u0111\u1ecbnh m\u1ee9c.<\/td><\/tr><tr><td>L\u1ef1a ch\u1ecdn \u0111\u1ed9ng c\u01a1 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi \u1ee9ng d\u1ee5ng<\/td><td>Ch\u1ecdn \u0111\u1ed9ng c\u01a1 ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1eb7c t\u00ednh t\u1ea3i th\u1ef1c t\u1ebf.<\/td><\/tr><tr><td>Nh\u1eefng thay \u0111\u1ed5i sau b\u1ea3o tr\u00ec \u0111\u00e3 l\u00e0m thay \u0111\u1ed5i c\u00e1c th\u00f4ng s\u1ed1 hi\u1ec7u su\u1ea5t c\u1ee7a c\u1ea7n c\u1ea9u.<\/td><td>Kh\u00f4i ph\u1ee5c c\u00e1c th\u00f4ng s\u1ed1 thi\u1ebft k\u1ebf ban \u0111\u1ea7u<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-2-stator-localized-overheating\">1.2 Hi\u1ec7n t\u01b0\u1ee3ng qu\u00e1 nhi\u1ec7t c\u1ee5c b\u1ed9 \u1edf stato<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Ng\u1eafn m\u1ea1ch c\u1ee5c b\u1ed9 gi\u1eefa c\u00e1c l\u00e1 th\u00e9p silic stato<\/td><td>Kh\u1eafc ph\u1ee5c nguy\u00ean nh\u00e2n g\u00e2y \u0111o\u1ea3n m\u1ea1ch; b\u00f4i vecni c\u00e1ch \u0111i\u1ec7n l\u00ean khu v\u1ef1c \u0111\u00e3 s\u1eeda ch\u1eefa.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-3-stator-winding-localized-overheating\">1.3 Hi\u1ec7n t\u01b0\u1ee3ng qu\u00e1 nhi\u1ec7t c\u1ee5c b\u1ed9 \u1edf cu\u1ed9n d\u00e2y stato<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>L\u1ed7i n\u1ed1i d\u00e2y Delta\/Star (\u0394\/Y)<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda c\u1ea5u h\u00ecnh d\u00e2y d\u1eabn.<\/td><\/tr><tr><td>Hai \u0111i\u1ec3m tr\u00ean cu\u1ed9n d\u00e2y m\u1ed9t pha b\u1ecb ng\u1eafn m\u1ea1ch v\u1edbi v\u1ecf m\u00e1y.<\/td><td>S\u1eeda ch\u1eefa cu\u1ed9n d\u00e2y pha b\u1ecb \u1ea3nh h\u01b0\u1edfng<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-4-rotor-temperature-rises-stator-draws-high-current-motor-wont-reach-full-speed-at-rated-load\">1.4 Nhi\u1ec7t \u0111\u1ed9 r\u00f4to t\u0103ng, stato ti\u00eau th\u1ee5 d\u00f2ng \u0111i\u1ec7n cao, \u0111\u1ed9ng c\u01a1 kh\u00f4ng \u0111\u1ea1t t\u1ed1c \u0111\u1ed9 t\u1ed1i \u0111a \u1edf t\u1ea3i \u0111\u1ecbnh m\u1ee9c<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Ti\u1ebfp x\u00fac k\u00e9m t\u1ea1i c\u00e1c \u0111\u1ea7u c\u1ef1c cu\u1ed9n d\u00e2y, \u0111i\u1ec3m trung t\u00ednh ho\u1eb7c c\u00e1c cu\u1ed9n d\u00e2y song song.<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa c\u00e1c m\u1ed1i h\u00e0n<\/td><\/tr><tr><td>Ti\u1ebfp x\u00fac k\u00e9m gi\u1eefa cu\u1ed9n d\u00e2y v\u00e0 v\u00f2ng tr\u01b0\u1ee3t<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa c\u00e1c k\u1ebft n\u1ed1i<\/td><\/tr><tr><td>Ti\u1ebfp x\u00fac k\u00e9m trong c\u01a1 ch\u1ebf ch\u1ed5i than<\/td><td>Ki\u1ec3m tra v\u00e0 \u0111i\u1ec1u ch\u1ec9nh b\u1ed9 ph\u1eadn ch\u1ed5i than<\/td><\/tr><tr><td>Ti\u1ebfp x\u00fac k\u00e9m trong m\u1ea1ch r\u00f4to<\/td><td>Ki\u1ec3m tra xem c\u00f3 b\u1ecb l\u1ecfng ho\u1eb7c ti\u1ebfp x\u00fac k\u00e9m kh\u00f4ng; ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf, thay th\u1ebf n\u1ebfu m\u1ea1ch h\u1edf.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-5-motor-vibration-during-operation\">1.5 \u0110\u1ed9 rung c\u1ee7a \u0111\u1ed9ng c\u01a1 trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Tr\u1ee5c \u0111\u1ed9ng c\u01a1 v\u00e0 tr\u1ee5c gi\u1ea3m t\u1ed1c kh\u00f4ng \u0111\u1ed3ng t\u00e2m<\/td><td>C\u0103n ch\u1ec9nh l\u1ea1i tr\u1ee5c<\/td><\/tr><tr><td>H\u01b0 h\u1ecfng ho\u1eb7c m\u00e0i m\u00f2n \u1ed5 tr\u1ee5c<\/td><td>Thay th\u1ebf b\u1ea1c \u0111\u1ea1n<\/td><\/tr><tr><td>Bi\u1ebfn d\u1ea1ng r\u00f4to<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa r\u00f4to<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-6-abnormal-noise-during-operation\">1.6 Ti\u1ebfng \u1ed3n b\u1ea5t th\u01b0\u1eddng trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>L\u1ec7ch pha stato (l\u1ed7i \u0111\u1ea5u d\u00e2y)<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n<\/td><\/tr><tr><td>L\u00f5i stato kh\u00f4ng \u0111\u01b0\u1ee3c n\u00e9n ch\u1eb7t.<\/td><td>Ki\u1ec3m tra stato v\u00e0 s\u1eeda ch\u1eefa<\/td><\/tr><tr><td>m\u00e0i m\u00f2n \u1ed5 tr\u1ee5c<\/td><td>Thay th\u1ebf b\u1ea1c \u0111\u1ea1n<\/td><\/tr><tr><td>S\u1ef1 m\u1edf r\u1ed9ng c\u1ee7a khe n\u00eam<\/td><td>C\u1eaft b\u1ecf ph\u1ea7n n\u00eam b\u1ecb gi\u00e3n ho\u1eb7c thay th\u1ebf<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-7-motor-speed-drops-under-load\">1.7 T\u1ed1c \u0111\u1ed9 \u0111\u1ed9ng c\u01a1 gi\u1ea3m khi c\u00f3 t\u1ea3i<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Ng\u1eafn m\u1ea1ch t\u1ea1i c\u00e1c \u0111\u1ea7u n\u1ed1i r\u00f4to<\/td><td>X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed v\u00e0 lo\u1ea1i b\u1ecf s\u1ef1 c\u1ed1 ng\u1eafn m\u1ea1ch.<\/td><\/tr><tr><td>Cu\u1ed9n d\u00e2y r\u00f4to \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t t\u1ea1i hai \u0111i\u1ec3m<\/td><td>Ki\u1ec3m tra t\u1eebng cu\u1ed9n d\u00e2y, s\u1eeda ch\u1eefa l\u1edbp c\u00e1ch \u0111i\u1ec7n b\u1ecb h\u01b0 h\u1ecfng.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-8-rotor-rubbing-against-stator-during-operation\">1.8 R\u00f4to c\u1ecd x\u00e1t v\u1edbi stato trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>\u1ed4 tr\u1ee5c b\u1ecb m\u00f2n, n\u1eafp cu\u1ed1i b\u1ecb l\u1ec7ch, l\u00f5i stato ho\u1eb7c r\u00f4to b\u1ecb bi\u1ebfn d\u1ea1ng.<\/td><td>Thay th\u1ebf b\u1ea1c \u0111\u1ea1n b\u1ecb h\u1ecfng; \u0111i\u1ec1u ch\u1ec9nh v\u1ecb tr\u00ed n\u1eafp cu\u1ed1i; lo\u1ea1i b\u1ecf c\u00e1c g\u1edd s\u1eafc nh\u1ecdn kh\u1ecfi l\u00f5i stato\/r\u00f4to.<\/td><\/tr><tr><td>\u0110\u1ea5u n\u1ed1i cu\u1ed9n d\u00e2y stato kh\u00f4ng \u0111\u00fang c\u00e1ch g\u00e2y m\u1ea5t c\u00e2n b\u1eb1ng t\u1eeb t\u00ednh<\/td><td>Ki\u1ec3m tra v\u00e0 \u0111i\u1ec1u ch\u1ec9nh c\u00e1c k\u1ebft n\u1ed1i cu\u1ed9n d\u00e2y; x\u00e1c minh d\u00f2ng \u0111i\u1ec7n \u0111\u1ec1u nhau \u1edf m\u1ed7i pha.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-9-sparking-at-brushes-or-scorched-slip-rings\">1.9 Tia l\u1eeda ph\u00e1t ra t\u1eeb ch\u1ed5i than ho\u1eb7c v\u00f2ng tr\u01b0\u1ee3t b\u1ecb ch\u00e1y x\u00e9m<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>B\u00e0n ch\u1ea3i \u0111\u1eb7t kh\u00f4ng \u0111\u00fang c\u00e1ch<\/td><td>L\u1eafp l\u1ea1i ch\u1ed5i than b\u1eb1ng c\u00e1ch m\u00e0i.<\/td><\/tr><tr><td>C\u1ecd qu\u00e1 l\u1ecfng trong gi\u00e1 \u0111\u1ee1<\/td><td>\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 v\u1eeba v\u1eb7n c\u1ee7a b\u00e0n ch\u1ea3i ho\u1eb7c thay th\u1ebf b\u1eb1ng b\u00e0n ch\u1ea3i c\u00f3 k\u00edch th\u01b0\u1edbc ph\u00f9 h\u1ee3p.<\/td><\/tr><tr><td>B\u00e0n ch\u1ea3i b\u1ea9n v\u00e0 v\u00f2ng tr\u01b0\u1ee3t<\/td><td>L\u00e0m s\u1ea1ch c\u00e1c v\u00f2ng tr\u01b0\u1ee3t b\u1eb1ng c\u1ed3n.<\/td><\/tr><tr><td>B\u1ec1 m\u1eb7t v\u00f2ng tr\u01b0\u1ee3t kh\u00f4ng b\u1eb1ng ph\u1eb3ng g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng ch\u1ed5i b\u1ecb n\u1ea3y<\/td><td>Gia c\u00f4ng v\u00e0 \u0111\u00e1nh b\u00f3ng b\u1ec1 m\u1eb7t v\u00f2ng tr\u01b0\u1ee3t<\/td><\/tr><tr><td>\u00c1p l\u1ef1c b\u00e0n ch\u1ea3i kh\u00f4ng \u0111\u1ee7<\/td><td>\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ebfn m\u1ee9c 18\u201320 kPa.<\/td><\/tr><tr><td>Lo\u1ea1i c\u1ecd kh\u00f4ng ph\u00f9 h\u1ee3p<\/td><td>Thay th\u1ebf b\u1eb1ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ch\u00ednh x\u00e1c<\/td><\/tr><tr><td>Ph\u00e2n b\u1ed5 d\u00f2ng \u0111i\u1ec7n kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u gi\u1eefa c\u00e1c ch\u1ed5i<\/td><td>Ki\u1ec3m tra c\u00e1c k\u1ebft n\u1ed1i c\u1ee7a b\u1ed9 c\u1ea5p ngu\u1ed3n gi\u00e1 \u0111\u1ee1 ch\u1ed5i than v\u00e0 s\u1eeda ch\u1eefa.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-10-slip-ring-open-circuit\">1.10 V\u00f2ng tr\u01b0\u1ee3t h\u1edf m\u1ea1ch<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>V\u00f2ng tr\u01b0\u1ee3t v\u00e0 c\u1ee5m ch\u1ed5i than b\u1ecb nhi\u1ec5m b\u1ea9n<\/td><td>L\u00e0m s\u1ea1ch k\u1ef9 l\u01b0\u1ee1ng<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-ac-electromagnet-failures\">2. H\u1ecfng h\u00f3c nam ch\u00e2m \u0111i\u1ec7n xoay chi\u1ec1u<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"2-1-coil-overheating\">2.1 Cu\u1ed9n d\u00e2y qu\u00e1 n\u00f3ng<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Nam ch\u00e2m \u0111i\u1ec7n b\u1ecb qu\u00e1 t\u1ea3i (l\u1ef1c l\u00f2 xo qu\u00e1 l\u1edbn)<\/td><td>\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 c\u0103ng c\u1ee7a l\u00f2 xo<\/td><\/tr><tr><td>C\u00f3 m\u1ed9t khe h\u1edf gi\u1eefa c\u00e1c b\u1ed9 ph\u1eadn c\u1ed1 \u0111\u1ecbnh v\u00e0 b\u1ed9 ph\u1eadn chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a m\u1ea1ch t\u1eeb.<\/td><td>Lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1ed1ng<\/td><\/tr><tr><td>\u0110i\u1ec7n \u00e1p cu\u1ed9n d\u00e2y kh\u00f4ng kh\u1edbp v\u1edbi \u0111i\u1ec7n \u00e1p ngu\u1ed3n.<\/td><td>Thay cu\u1ed9n d\u00e2y ho\u1eb7c thay \u0111\u1ed5i ph\u01b0\u01a1ng ph\u00e1p k\u1ebft n\u1ed1i<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"2-2-excessive-humming-noise-during-operation\">2.2 Ti\u1ebfng \u1ed3n\/ti\u1ebfng vo ve qu\u00e1 m\u1ee9c trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Nam ch\u00e2m \u0111i\u1ec7n b\u1ecb qu\u00e1 t\u1ea3i<\/td><td>\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 c\u0103ng c\u1ee7a l\u00f2 xo<\/td><\/tr><tr><td>B\u1ee5i b\u1ea9n tr\u00ean b\u1ec1 m\u1eb7t l\u00e0m vi\u1ec7c c\u1ee7a m\u1ea1ch t\u1eeb<\/td><td>L\u00e0m s\u1ea1ch k\u1ef9 l\u01b0\u1ee1ng<\/td><\/tr><tr><td>H\u1ec7 th\u1ed1ng t\u1eeb t\u00ednh b\u1ecb l\u1ec7ch<\/td><td>\u0110i\u1ec1u ch\u1ec9nh c\u00e1c b\u1ed9 ph\u1eadn c\u01a1 kh\u00ed c\u1ee7a h\u1ec7 th\u1ed1ng phanh, kh\u1eafc ph\u1ee5c s\u1ef1 l\u1ec7ch tr\u1ee5c.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"2-3-unable-to-overcome-spring-force\">2.3 Kh\u00f4ng th\u1ec3 v\u01b0\u1ee3t qua l\u1ef1c \u0111\u00e0n h\u1ed3i<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Nam ch\u00e2m \u0111i\u1ec7n b\u1ecb qu\u00e1 t\u1ea3i \/ L\u1ef1c l\u00f2 xo ch\u00ednh qu\u00e1 cao<\/td><td>\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 c\u0103ng c\u1ee7a l\u00f2 xo ch\u00ednh phanh<\/td><\/tr><tr><td>\u0110i\u1ec7n \u00e1p ngu\u1ed3n th\u1ea5p<\/td><td>T\u1ea1m ng\u1eebng ho\u1ea1t \u0111\u1ed9ng cho \u0111\u1ebfn khi \u0111i\u1ec7n \u00e1p \u0111\u01b0\u1ee3c kh\u00f4i ph\u1ee5c.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-ac-contactor-and-relay-failures\">3. H\u1ecfng c\u00f4ng t\u1eafc t\u01a1 v\u00e0 r\u01a1le AC<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"3-1-coil-overheating\">3.1 Cu\u1ed9n d\u00e2y qu\u00e1 n\u00f3ng<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Cu\u1ed9n d\u00e2y b\u1ecb qu\u00e1 t\u1ea3i<\/td><td>Gi\u1ea3m \u00e1p l\u1ef1c ti\u1ebfp x\u00fac di \u0111\u1ed9ng so v\u1edbi ti\u1ebfp x\u00fac c\u1ed1 \u0111\u1ecbnh<\/td><\/tr><tr><td>Ph\u1ea7n chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a m\u1ea1ch t\u1eeb kh\u00f4ng ch\u1ea1m t\u1edbi ph\u1ea7n c\u1ed1 \u0111\u1ecbnh.<\/td><td>Kh\u1eafc ph\u1ee5c t\u00ecnh tr\u1ea1ng l\u1ec7ch tr\u1ee5c, k\u1eb9t, b\u1ee5i b\u1ea9n; thay th\u1ebf cu\u1ed9n d\u00e2y n\u1ebfu b\u1ecb h\u01b0 h\u1ecfng.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"3-2-excessive-contactor-buzzing\">3.2 Ti\u1ebfng vo ve qu\u00e1 m\u1ee9c c\u1ee7a c\u00f4ng t\u1eafc t\u01a1<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Cu\u1ed9n d\u00e2y b\u1ecb qu\u00e1 t\u1ea3i<\/td><td>Gi\u1ea3m \u00e1p l\u1ef1c ti\u1ebfp x\u00fac<\/td><\/tr><tr><td>B\u1ee5i b\u1ea9n tr\u00ean b\u1ec1 m\u1eb7t m\u1ea1ch t\u1eeb<\/td><td>L\u00e0m s\u1ea1ch b\u1ec1 m\u1eb7t<\/td><\/tr><tr><td>Hi\u1ec7n t\u01b0\u1ee3ng k\u1eb9t trong h\u1ec7 th\u1ed1ng t\u1ef1 \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1eddng d\u1eabn t\u1eeb t\u00ednh<\/td><td>Lo\u1ea1i b\u1ecf v\u1eadt c\u1ea3n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"3-3-contact-overheating-or-burned-destroyed\">3.3 Ti\u1ebfp \u0111i\u1ec3m b\u1ecb qu\u00e1 nhi\u1ec7t ho\u1eb7c b\u1ecb ch\u00e1y\/h\u1ecfng<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>\u00c1p su\u1ea5t ti\u1ebfp x\u00fac kh\u00f4ng \u0111\u1ee7<\/td><td>\u0110i\u1ec1u ch\u1ec9nh \u00e1p su\u1ea5t<\/td><\/tr><tr><td>C\u00e1c ti\u1ebfp \u0111i\u1ec3m b\u1ea9n<\/td><td>L\u00e0m s\u1ea1ch ho\u1eb7c thay th\u1ebf<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"3-4-main-contactor-wont-engage\">3.4 C\u00f4ng t\u1eafc t\u01a1 ch\u00ednh kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>C\u00f4ng t\u1eafc dao ho\u1eb7c c\u00f4ng t\u1eafc kh\u1ea9n c\u1ea5p ch\u01b0a \u0111\u01b0\u1ee3c \u0111\u00f3ng<\/td><td>\u0110\u00f3ng c\u00f4ng t\u1eafc<\/td><\/tr><tr><td>C\u00f4ng t\u1eafc c\u1eeda s\u1eadp\/c\u1eeda ra v\u00e0o \u0111ang m\u1edf<\/td><td>\u0110\u00f3ng c\u00f4ng t\u1eafc c\u1eeda<\/td><\/tr><tr><td>Tay c\u1ea7m \u0111i\u1ec1u khi\u1ec3n kh\u00f4ng \u1edf v\u1ecb tr\u00ed s\u1ed1 kh\u00f4ng.<\/td><td>\u0110\u01b0a tay c\u1ea7m tr\u1edf v\u1ec1 v\u1ecb tr\u00ed s\u1ed1 kh\u00f4ng.<\/td><\/tr><tr><td>C\u1ea7u ch\u00ec m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n b\u1ecb \u0111\u1ee9t<\/td><td>Ki\u1ec3m tra ho\u1eb7c thay th\u1ebf c\u1ea7u ch\u00ec.<\/td><\/tr><tr><td>Kh\u00f4ng c\u00f3 \u0111i\u1ec7n \u00e1p tr\u00ean \u0111\u01b0\u1eddng d\u00e2y<\/td><td>Ki\u1ec3m tra ngu\u1ed3n \u0111i\u1ec7n l\u01b0\u1edbi<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"3-5-frequent-tripping-during-crane-operation\">3.5 Hi\u1ec7n t\u01b0\u1ee3ng v\u1ea5p ng\u00e3 th\u01b0\u1eddng xuy\u00ean trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh c\u1ea7n c\u1ea9u<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>\u00c1p su\u1ea5t ti\u1ebfp x\u00fac kh\u00f4ng \u0111\u1ee7<\/td><td>\u0110i\u1ec1u ch\u1ec9nh \u00e1p l\u1ef1c ti\u1ebfp x\u00fac<\/td><\/tr><tr><td>C\u00e1c ti\u1ebfp \u0111i\u1ec3m b\u1ecb ch\u00e1y<\/td><td>Thay th\u1ebf c\u00e1c \u0111i\u1ec3m ti\u1ebfp x\u00fac ho\u1eb7c m\u00e0i v\u00e0 s\u1eeda ch\u1eefa.<\/td><\/tr><tr><td>C\u00e1c ti\u1ebfp \u0111i\u1ec3m b\u1ea9n<\/td><td>Lau d\u1ecdn<\/td><\/tr><tr><td>Ho\u1ea1t \u0111\u1ed9ng qu\u00e1 t\u1ea3i g\u00e2y ra d\u00f2ng \u0111i\u1ec7n qu\u00e1 m\u1ee9c<\/td><td>Gi\u1ea3m t\u1ea3i<\/td><\/tr><tr><td>Ti\u1ebfp x\u00fac k\u00e9m gi\u1eefa \u0111\u01b0\u1eddng d\u00e2y thu v\u00e0 \u0111\u01b0\u1eddng d\u00e2y d\u1eabn.<\/td><td>S\u1eeda ch\u1eefa \u0111\u01b0\u1eddng ray ho\u1eb7c h\u1ec7 th\u1ed1ng d\u1eabn \u0111i\u1ec7n r\u00e3nh<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-hydraulic-electromagnet-thruster-failures\">4. H\u1ecfng h\u00f3c nam ch\u00e2m \u0111i\u1ec7n th\u1ee7y l\u1ef1c (\u0111\u1ed9ng c\u01a1 \u0111\u1ea9y)<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"4-1-push-rod-wont-move-after-power-on\">4.1 C\u1ea7n \u0111\u1ea9y kh\u00f4ng di chuy\u1ec3n sau khi b\u1eadt ngu\u1ed3n<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>C\u1ea7n \u0111\u1ea9y b\u1ecb k\u1eb9t<\/td><td>Lo\u1ea1i b\u1ecf v\u1eadt c\u1ea3n<\/td><\/tr><tr><td>\u0110i\u1ec7n \u00e1p ngu\u1ed3n d\u01b0\u1edbi 85% c\u1ee7a \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c<\/td><td>T\u0103ng \u0111i\u1ec7n \u00e1p l\u00ean m\u1ee9c \u0111\u1ecbnh m\u1ee9c.<\/td><\/tr><tr><td>R\u01a1le tr\u1ec5 th\u1eddi gian (tr\u00ean b\u1ed9 ch\u1ec9nh l\u01b0u silicon ZLO) \u0111\u01b0\u1ee3c \u0111\u1eb7t qu\u00e1 ng\u1eafn.<\/td><td>\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ebfn kho\u1ea3ng 0,5 gi\u00e2y<\/td><\/tr><tr><td>B\u1ed9 ch\u1ec9nh l\u01b0u kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng<\/td><td>S\u1eeda ch\u1eefa ho\u1eb7c thay th\u1ebf<\/td><\/tr><tr><td>B\u1ed9 ch\u1ec9nh l\u01b0u b\u1ecb h\u1ecfng<\/td><td>S\u1eeda ch\u1eefa ho\u1eb7c thay th\u1ebf<\/td><\/tr><tr><td>Ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng m\u1edf c\u1ee7a r\u01a1le th\u1eddi gian kh\u00f4ng \u0111\u00f3ng<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa ti\u1ebfp \u0111i\u1ec3m<\/td><\/tr><tr><td>Kh\u00f4ng c\u00f3 d\u1ea7u ho\u1eb7c r\u00f2 r\u1ec9 d\u1ea7u nghi\u00eam tr\u1ecdng<\/td><td>S\u1eeda ch\u1eefa gio\u0103ng, ch\u00e2m th\u00eam d\u1ea7u<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"4-2-push-rod-stroke-too-short\">4.2 H\u00e0nh tr\u00ecnh c\u1ea7n \u0111\u1ea9y qu\u00e1 ng\u1eafn<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Thi\u1ebfu d\u1ea7u<\/td><td>Ch\u00e2m th\u00eam d\u1ea7u<\/td><\/tr><tr><td>Kh\u00f4ng kh\u00ed b\u1ecb k\u1eb9t gi\u1eefa p\u00edt-t\u00f4ng v\u00e0 \u1ed5 tr\u1ee5c<\/td><td>X\u1ea3 kh\u00ed<\/td><\/tr><tr><td>C\u00e0i \u0111\u1eb7t h\u00e0nh tr\u00ecnh qu\u00e1 th\u1ea5p<\/td><td>\u0110i\u1ec1u ch\u1ec9nh n\u00e9t v\u1ebd cho ph\u00f9 h\u1ee3p<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"4-3-stroke-gradually-decreases-after-operation\">4.3 \u0110\u1ed9t qu\u1ef5 gi\u1ea3m d\u1ea7n sau ph\u1eabu thu\u1eadt<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>R\u00f2 r\u1ec9 d\u1ea7u xi lanh<\/td><td>Thay th\u1ebf xi lanh<\/td><\/tr><tr><td>Van \u0111\u0129a ki\u1ec3u b\u00e1nh r\u0103ng ho\u1eb7c van \u0111\u0129a l\u00f5i di \u0111\u1ed9ng kh\u00f4ng k\u00edn kh\u00edt.<\/td><td>Lo\u1ea1i b\u1ecf c\u00e1c t\u1ea1p ch\u1ea5t c\u01a1 h\u1ecdc kh\u1ecfi \u0111\u0129a van.<\/td><\/tr><tr><td>V\u00f2ng \u0111\u1ec7m b\u1ecb h\u01b0 h\u1ecfng nghi\u00eam tr\u1ecdng<\/td><td>Thay th\u1ebf v\u00f2ng \u0111\u1ec7m<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"4-4-start-up-time-too-long\">4.4 Th\u1eddi gian kh\u1edfi \u0111\u1ed9ng qu\u00e1 l\u00e2u<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>\u0110i\u1ec7n \u00e1p qu\u00e1 th\u1ea5p<\/td><td>T\u0103ng \u0111i\u1ec7n \u00e1p<\/td><\/tr><tr><td>C\u00e1c b\u1ed9 ph\u1eadn chuy\u1ec3n \u0111\u1ed9ng b\u1ecb k\u1eb9t<\/td><td>Lo\u1ea1i b\u1ecf v\u1eadt c\u1ea3n<\/td><\/tr><tr><td>M\u00f4-men xo\u1eafn phanh \u0111\u01b0\u1ee3c \u0111\u1eb7t qu\u00e1 cao<\/td><td>\u0110i\u1ec1u ch\u1ec9nh m\u00f4-men xo\u1eafn phanh v\u1ec1 gi\u00e1 tr\u1ecb \u0111\u1ecbnh m\u1ee9c.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"4-5-braking-time-too-long\">4.5 Th\u1eddi gian phanh qu\u00e1 d\u00e0i<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>Ti\u1ebfp \u0111i\u1ec3m c\u1ee7a r\u01a1le th\u1eddi gian kh\u00f4ng m\u1edf<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa ti\u1ebfp \u0111i\u1ec3m<\/td><\/tr><tr><td>C\u00e1c b\u1ed9 ph\u1eadn chuy\u1ec3n \u0111\u1ed9ng b\u1ecb k\u1eb9t<\/td><td>Lo\u1ea1i b\u1ecf v\u1eadt c\u1ea3n<\/td><\/tr><tr><td>\u0110\u01b0\u1eddng d\u1eabn d\u1ea7u b\u1ecb t\u1eafc<\/td><td>\u0110\u01b0\u1eddng d\u1eabn d\u1ea7u th\u00f4ng tho\u00e1ng<\/td><\/tr><tr><td>L\u1ed7i c\u01a1 kh\u00ed trong h\u1ec7 th\u1ed1ng phanh<\/td><td>S\u1eeda ch\u1eefa l\u1ed7i c\u01a1 kh\u00ed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"part-2-control-and-circuit-system-failures\">Ph\u1ea7n 2: C\u00e1c l\u1ed7i h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 m\u1ea1ch \u0111i\u1ec7n<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/www.kscranegroup.com\/wp-content\/uploads\/2026\/06\/2Overhead-Crane-Electrical-System-Failures-Electromagnet.jpg\" alt=\"\" class=\"wp-image-11540\" srcset=\"https:\/\/www.kscranegroup.com\/wp-content\/uploads\/2026\/06\/2Overhead-Crane-Electrical-System-Failures-Electromagnet.jpg 600w, https:\/\/www.kscranegroup.com\/wp-content\/uploads\/2026\/06\/2Overhead-Crane-Electrical-System-Failures-Electromagnet-150x150.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-protection-box-knife-switch-closed-\u2192-control-circuit-fuse-blows\">1. C\u00f4ng t\u1eafc dao trong h\u1ed9p b\u1ea3o v\u1ec7 \u0111\u00f3ng \u2192 C\u1ea7u ch\u00ec m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n b\u1ecb \u0111\u1ee9t<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>L\u1ed7i ch\u1ea1m \u0111\u1ea5t trong m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n<\/td><td>S\u1eed d\u1ee5ng m\u00e1y \u0111o \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh pha n\u1ed1i \u0111\u1ea5t v\u00e0 lo\u1ea1i b\u1ecf n\u00f3.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-over-current-relay-trips-when-controller-engaged\">2. R\u01a1le qu\u00e1 d\u00f2ng ng\u1eaft khi b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>C\u00e0i \u0111\u1eb7t r\u01a1le kh\u00f4ng ch\u00ednh x\u00e1c cho \u0111\u1ed9ng c\u01a1<\/td><td>\u0110i\u1ec1u ch\u1ec9nh c\u00e0i \u0111\u1eb7t: I_set = (2,25\u20132,5) \u00d7 I_rated<\/td><\/tr><tr><td>C\u01a1 c\u1ea5u truy\u1ec1n \u0111\u1ed9ng c\u01a1 kh\u00ed b\u1ecb k\u1eb9t, g\u00e2y qu\u00e1 t\u1ea3i cho \u0111\u1ed9ng c\u01a1.<\/td><td>X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed v\u00e0 lo\u1ea1i b\u1ecf v\u1eadt c\u1ea3n c\u01a1 h\u1ecdc<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-main-contactor-engages-\u2192-incoming-line-fuse-blows\">3. C\u00f4ng t\u1eafc t\u01a1 ch\u00ednh \u0111\u00f3ng \u2192 C\u1ea7u ch\u00ec \u0111\u01b0\u1eddng d\u00e2y v\u00e0o b\u1ecb \u0111\u1ee9t<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>L\u1ed7i ch\u1ea1m \u0111\u1ea5t \u1edf pha \u0111\u00f3<\/td><td>X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 ch\u1ea1m \u0111\u1ea5t<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-controller-engaged-but-motor-doesnt-rotate\">4. B\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u00e3 \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t nh\u01b0ng \u0111\u1ed9ng c\u01a1 kh\u00f4ng quay.<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>M\u1ed9t pha b\u1ecb h\u1edf \u2014 \u0111\u1ed9ng c\u01a1 k\u00eau vo vo<\/td><td>X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed \u0111\u1ee9t g\u00e3y v\u00e0 k\u1ebft n\u1ed1i l\u1ea1i.<\/td><\/tr><tr><td>M\u1ea1ch r\u00f4to b\u1ecb h\u1edf<\/td><td>X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed \u0111\u1ee9t g\u00e3y v\u00e0 k\u1ebft n\u1ed1i l\u1ea1i.<\/td><\/tr><tr><td>Kh\u00f4ng c\u00f3 \u0111i\u1ec7n \u00e1p tr\u00ean \u0111\u01b0\u1eddng d\u00e2y<\/td><td>X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed \u0111\u1ee9t g\u00e3y v\u00e0 k\u1ebft n\u1ed1i l\u1ea1i.<\/td><\/tr><tr><td>C\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a b\u1ed9 \u0111i\u1ec1u khi\u1ec3n th\u1ef1c t\u1ebf kh\u00f4ng ti\u1ebfp x\u00fac.<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa b\u1ed9 \u0111i\u1ec1u khi\u1ec3n<\/td><\/tr><tr><td>L\u1ed7i ch\u1ed5i thu gom<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa b\u1ed9 thu gom<\/td><\/tr><tr><td>L\u1ed7i phanh \u2014 kh\u00f4ng nh\u1ea3<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa phanh<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Ki\u1ec3m tra nhanh:<\/strong> N\u1ebfu \u0111\u1ed9ng c\u01a1 ph\u00e1t ra ti\u1ebfng \u1ed3n nh\u01b0ng kh\u00f4ng quay, h\u1ea7u h\u1ebft \u0111\u00f3 l\u00e0 do s\u1ef1 c\u1ed1 m\u1ed9t pha. Tr\u01b0\u1edbc ti\u00ean, h\u00e3y ki\u1ec3m tra ngu\u1ed3n \u0111i\u1ec7n v\u00e0 d\u00e2y d\u1eabn m\u1ea1ch r\u00f4to.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-controller-engaged-\u2192-motor-runs-in-one-direction-only\">5. B\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t \u2192 \u0110\u1ed9ng c\u01a1 ch\u1ec9 ch\u1ea1y theo m\u1ed9t h\u01b0\u1edbng.<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>C\u00e1c ti\u1ebfp \u0111i\u1ec3m \u0111\u1ea3o chi\u1ec1u c\u1ee7a b\u1ed9 \u0111i\u1ec1u khi\u1ec3n ho\u1ea1t \u0111\u1ed9ng k\u00e9m ho\u1eb7c kh\u00f3a li\u00ean \u0111\u1ed9ng c\u01a1 kh\u00ed b\u1ecb l\u1ed7i.<\/td><td>Ki\u1ec3m tra b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, \u0111i\u1ec1u ch\u1ec9nh c\u00e1c ti\u1ebfp \u0111i\u1ec3m<\/td><\/tr><tr><td>L\u1ed7i \u1edf h\u1ec7 th\u1ed1ng d\u00e2y d\u1eabn ph\u00e2n ph\u1ed1i \u0111i\u1ec7n<\/td><td>S\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p n\u1ed1i t\u1eaft d\u00e2y d\u1eabn \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1.<\/td><\/tr><tr><td>C\u01a1 c\u1ea5u di chuy\u1ec3n \u1edf v\u1ecb tr\u00ed c\u1ef1c \u0111\u1ea1i, c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t<\/td><td>Ch\u1ec9 c\u00f3 th\u1ec3 ch\u1ea1y theo m\u1ed9t h\u01b0\u1edbng \u2014 h\u00e0nh vi b\u00ecnh th\u01b0\u1eddng<\/td><\/tr><tr><td>C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n b\u1ecb tr\u1ee5c tr\u1eb7c<\/td><td>Ki\u1ec3m tra c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-limit-switch-activated-\u2192-main-contactor-wont-release\">6. C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t \u2192 C\u00f4ng t\u1eafc t\u01a1 ch\u00ednh kh\u00f4ng nh\u1ea3<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>M\u1ea1ch h\u1edf trong m\u1ea1ch c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n<\/td><td>Ki\u1ec3m tra v\u00e0 s\u1eeda ch\u1eefa m\u1ea1ch h\u1edf<\/td><\/tr><tr><td>D\u00e2y d\u1eabn \u0111\u1ebfn b\u1ed9 \u0111i\u1ec1u khi\u1ec3n b\u1ecb \u0111\u1ea5u n\u1ed1i sai.<\/td><td>\u0110\u1ea5u d\u00e2y \u0111\u00fang c\u00e1ch<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"7-controller-returned-to-off-\u2192-main-contactor-wont-release\">7. B\u1ed9 \u0111i\u1ec1u khi\u1ec3n tr\u1edf v\u1ec1 v\u1ecb tr\u00ed T\u1eaft \u2192 C\u00f4ng t\u1eafc t\u01a1 ch\u00ednh kh\u00f4ng nh\u1ea3<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>C\u01a1 c\u1ea5u h\u00e3m b\u1ecb l\u1ed7i<\/td><td>S\u1eeda ch\u1ed1t h\u00e3m<\/td><\/tr><tr><td>C\u00e1c ti\u1ebfp \u0111i\u1ec3m b\u1ecb k\u1eb9t trong bu\u1ed3ng h\u1ed3 quang<\/td><td>\u0110i\u1ec1u ch\u1ec9nh v\u1ecb tr\u00ed ti\u1ebfp x\u00fac<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"8-controller-handle-jammed-during-operation\">8. Tay c\u1ea7m \u0111i\u1ec1u khi\u1ec3n b\u1ecb k\u1eb9t trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>C\u01a1 c\u1ea5u h\u00e3m b\u1ecb l\u1ed7i<\/td><td>\u0110i\u1ec1u ch\u1ec9nh \u00e1p l\u1ef1c ch\u1ed1t h\u00e3m<\/td><\/tr><tr><td>C\u00e1c m\u1ed1i n\u1ed1i \u0111\u01b0\u1ee3c h\u00e0n v\u1edbi nhau<\/td><td>Danh b\u1ea1 t\u1ec7p s\u1ea1ch<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"9-generator-fails-to-excite-for-crane-with-onboard-generator-set\">9. M\u00e1y ph\u00e1t \u0111i\u1ec7n kh\u00f4ng kh\u1edfi \u0111\u1ed9ng (\u0111\u1ed1i v\u1edbi c\u1ea7n c\u1ea9u c\u00f3 m\u00e1y ph\u00e1t \u0111i\u1ec7n t\u00edch h\u1ee3p)<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>M\u1ea1ch k\u00edch th\u00edch b\u1ecb h\u1edf<\/td><td>Ki\u1ec3m tra m\u1ea1ch k\u00edch th\u00edch<\/td><\/tr><tr><td>M\u00e1y ph\u00e1t \u0111i\u1ec7n quay ng\u01b0\u1ee3c chi\u1ec1u<\/td><td>Ho\u00e1n \u0111\u1ed5i hai pha c\u1ee7a d\u00e2y d\u1eabn r\u00f4to m\u1ea1ch truy\u1ec1n \u0111\u1ed9ng<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"10-power-cut-but-protection-box-contactor-wont-drop-out-control-circuit-de-energized\">10. M\u1ea5t \u0111i\u1ec7n nh\u01b0ng c\u00f4ng t\u1eafc t\u01a1 h\u1ed9p b\u1ea3o v\u1ec7 kh\u00f4ng ng\u1eaft (M\u1ea1ch \u0111i\u1ec1u khi\u1ec3n b\u1ecb ng\u1eaft \u0111i\u1ec7n)<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th><th>Bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c<\/th><\/tr><\/thead><tbody><tr><td>N\u1ed1i \u0111\u1ea5t ho\u1eb7c ng\u1eafn m\u1ea1ch \u1edf \u0111\u00e2u \u0111\u00f3 trong m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n<\/td><td>X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed v\u00e0 lo\u1ea1i b\u1ecf<\/td><\/tr><tr><td>C\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a c\u00f4ng t\u1eafc t\u01a1 b\u1ecb h\u00e0n d\u00ednh \u2014 m\u1ea1ch ch\u00ednh v\u1eabn \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n.<\/td><td>L\u01b0u tr\u1eef c\u00e1c li\u00ean h\u1ec7 b\u1ecb ch\u00e1y \u0111\u1ec3 kh\u00f4i ph\u1ee5c l\u1ea1i li\u00ean h\u1ec7 b\u00ecnh th\u01b0\u1eddng.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"quick-diagnostic-flow-for-overhead-crane-electrical-problems\">Quy tr\u00ecnh ch\u1ea9n \u0111o\u00e1n nhanh c\u00e1c s\u1ef1 c\u1ed1 \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao<\/h2>\n\n\n\n<p>Khi kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 \u0111i\u1ec7n, h\u00e3y l\u00e0m theo tr\u00ecnh t\u1ef1 n\u00e0y tr\u01b0\u1edbc khi m\u1edf b\u1ea5t k\u1ef3 b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n n\u00e0o:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1532\" height=\"904\" src=\"https:\/\/www.kscranegroup.com\/wp-content\/uploads\/2026\/06\/Quick-Diagnostic-Flow-for-Overhead-Crane-Electrical-Problems.png\" alt=\"\" class=\"wp-image-11558\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"replace-vs-repair-guide-for-crane-electrical-components\">H\u01b0\u1edbng d\u1eabn thay th\u1ebf so v\u1edbi s\u1eeda ch\u1eefa c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Th\u00e0nh ph\u1ea7n<\/th><th>Thay th\u1ebf<\/th><th>C\u00f3 th\u1ec3 s\u1eeda ch\u1eefa<\/th><\/tr><\/thead><tbody><tr><td>\u0110\u1ed9ng c\u01a1 c\u00f3 cu\u1ed9n d\u00e2y b\u1ecb ch\u00e1y<\/td><td>\u2713<\/td><td>\u2014<\/td><\/tr><tr><td>\u0110\u1ed9ng c\u01a1 ch\u1ec9 b\u1ecb m\u00f2n \u1ed5 bi<\/td><td>\u2014<\/td><td>\u2713 Thay th\u1ebf b\u1ea1c \u0111\u1ea1n<\/td><\/tr><tr><td>C\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a c\u00f4ng t\u1eafc t\u01a1 b\u1ecb ch\u00e1y\/h\u00e0n<\/td><td>\u2713 (n\u1ebfu nghi\u00eam tr\u1ecdng)<\/td><td>\u2713 S\u1eafp x\u1ebfp v\u00e0 d\u1ecdn d\u1eb9p (nh\u1ecf)<\/td><\/tr><tr><td>V\u00f2ng tr\u01b0\u1ee3t b\u1ecb ch\u00e1y<\/td><td>\u2014<\/td><td>\u2713 Gia c\u00f4ng v\u00e0 \u0111\u00e1nh b\u00f3ng<\/td><\/tr><tr><td>B\u1ed9 ch\u1ec9nh l\u01b0u b\u1ecb h\u1ecfng<\/td><td>\u2713<\/td><td>\u2014<\/td><\/tr><tr><td>C\u1ea7u ch\u00ec b\u1ecb ch\u00e1y<\/td><td>\u2713<\/td><td>\u2014 (Tr\u01b0\u1edbc ti\u00ean h\u00e3y ch\u1ea9n \u0111o\u00e1n nguy\u00ean nh\u00e2n)<\/td><\/tr><tr><td>Nam ch\u00e2m \u0111i\u1ec7n b\u1ecb k\u1eb9t\/m\u1eafc k\u1eb9t<\/td><td>\u2014<\/td><td>\u2713 L\u00e0m s\u1ea1ch v\u00e0 b\u00f4i tr\u01a1n<\/td><\/tr><tr><td>Xi lanh \u0111\u1ea9y th\u1ee7y l\u1ef1c b\u1ecb r\u00f2 r\u1ec9<\/td><td>\u2713<\/td><td>\u2014<\/td><\/tr><tr><td>C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n b\u1ecb l\u1ec7ch<\/td><td>\u2014<\/td><td>\u2713 \u0110i\u1ec1u ch\u1ec9nh v\u1ecb tr\u00ed<\/td><\/tr><tr><td>C\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a c\u00f4ng t\u1eafc t\u01a1 ch\u00ednh \u0111\u01b0\u1ee3c h\u00e0n<\/td><td>\u2713<\/td><td>\u2014<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"preventive-maintenance-for-overhead-crane-electrical-systems\">B\u1ea3o tr\u00ec ph\u00f2ng ng\u1eeba cho h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao<\/h2>\n\n\n\n<p>Vi\u1ec7c ng\u0103n ng\u1eeba s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao ti\u1ebft ki\u1ec7m chi ph\u00ed h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi vi\u1ec7c ph\u1ea3i ng\u1eebng ho\u1ea1t \u0111\u1ed9ng kh\u1ea9n c\u1ea5p ho\u1eb7c thay th\u1ebf linh ki\u1ec7n. M\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh b\u1ea3o tr\u00ec \u0111i\u1ec7n b\u00e0i b\u1ea3n c\u00f3 th\u1ec3 gi\u1ea3m thi\u1ec3u c\u00e1c s\u1ef1 c\u1ed1 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9t xu\u1ea5t, c\u1ea3i thi\u1ec7n an to\u00e0n c\u1ea7n c\u1ea9u v\u00e0 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd thi\u1ebft b\u1ecb.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"inspect-electrical-connections-regularly\">Ki\u1ec3m tra c\u00e1c m\u1ed1i n\u1ed1i \u0111i\u1ec7n th\u01b0\u1eddng xuy\u00ean.<\/h3>\n\n\n\n<p>C\u00e1c \u0111\u1ea7u n\u1ed1i b\u1ecb l\u1ecfng, d\u00e2y d\u1eabn b\u1ecb h\u01b0 h\u1ecfng v\u00e0 ti\u1ebfp \u0111\u1ea5t k\u00e9m l\u00e0 m\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn nh\u1ea5t g\u00e2y ra s\u1ef1 c\u1ed1 \u0111i\u1ec7n \u1edf c\u1ea7n c\u1ea9u tr\u00ean cao. B\u1ea3ng \u0111i\u1ec7n, h\u1ec7 th\u1ed1ng d\u00e2y d\u1eabn v\u00e0 kh\u1ed1i \u0111\u1ea5u n\u1ed1i c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"monitor-motor-temperature\">Theo d\u00f5i nhi\u1ec7t \u0111\u1ed9 \u0111\u1ed9ng c\u01a1<\/h3>\n\n\n\n<p>Hi\u1ec7n t\u01b0\u1ee3ng \u0111\u1ed9ng c\u01a1 qu\u00e1 n\u00f3ng l\u00e0 nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y h\u1ecfng \u0111\u1ed9ng c\u01a1 c\u1ea7n c\u1ea9u. Ng\u01b0\u1eddi v\u1eadn h\u00e0nh n\u00ean theo d\u00f5i s\u1ef1 t\u0103ng nhi\u1ec7t \u0111\u1ed9, m\u00f9i l\u1ea1, \u0111\u1ed9 rung v\u00e0 d\u00f2ng \u0111i\u1ec7n ti\u00eau th\u1ee5 \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u1edbm c\u00e1c \u0111i\u1ec1u ki\u1ec7n v\u1eadn h\u00e0nh b\u1ea5t th\u01b0\u1eddng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"check-contactors-and-relays\">Ki\u1ec3m tra c\u00e1c c\u00f4ng t\u1eafc t\u01a1 v\u00e0 r\u01a1le.<\/h3>\n\n\n\n<p>Vi\u1ec7c chuy\u1ec3n m\u1ea1ch th\u01b0\u1eddng xuy\u00ean g\u00e2y m\u00e0i m\u00f2n b\u1ec1 m\u1eb7t c\u1ee7a c\u00f4ng t\u1eafc t\u01a1. C\u00e1c ti\u1ebfp \u0111i\u1ec3m b\u1ecb ch\u00e1y ho\u1eb7c h\u00e0n d\u00ednh c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn s\u1ef1 c\u1ed1 gi\u00e1n \u0111o\u1ea1n ho\u1eb7c m\u1ea5t \u0111i\u1ec7n ho\u00e0n to\u00e0n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"test-limit-switches-and-safety-devices\">Ki\u1ec3m tra c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 thi\u1ebft b\u1ecb an to\u00e0n<\/h3>\n\n\n\n<p>C\u00e1c c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n b\u1ecb l\u1ed7i th\u01b0\u1eddng g\u00e2y ra c\u00e1c s\u1ef1 c\u1ed1 d\u1eebng ho\u1eb7c thay \u0111\u1ed5i h\u01b0\u1edbng \u0111\u1ed9t ng\u1ed9t. C\u00e1c kh\u00f3a an to\u00e0n, h\u1ec7 th\u1ed1ng d\u1eebng kh\u1ea9n c\u1ea5p v\u00e0 c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n h\u00e0nh tr\u00ecnh c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra th\u01b0\u1eddng xuy\u00ean.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"follow-scheduled-electrical-inspections\">Tu\u00e2n th\u1ee7 l\u1ecbch ki\u1ec3m tra \u0111i\u1ec7n \u0111\u1ecbnh k\u1ef3.<\/h3>\n\n\n\n<p>Vi\u1ec7c b\u1ea3o tr\u00ec \u0111i\u1ec7n \u0111\u1ecbnh k\u1ef3 cho c\u1ea7n c\u1ea9u tr\u00ean cao c\u1ea7n bao g\u1ed3m ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n, x\u00e1c minh m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n, ki\u1ec3m tra \u0111\u01b0\u1eddng ray d\u1eabn \u0111i\u1ec7n v\u00e0 ki\u1ec3m tra h\u1ec7 th\u1ed1ng phanh.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"need-expert-support-for-overhead-crane-electrical-system-failures\">C\u1ea7n h\u1ed7 tr\u1ee3 chuy\u00ean gia khi x\u1ea3y ra s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n tr\u00ean c\u1ea7n c\u1ea9u tr\u1ee5c?<\/h2>\n\n\n\n<p>T\u1ea1i KUANGSHAN CRANE, ch\u00fang t\u00f4i cung c\u1ea5p c\u00e1c gi\u1ea3i ph\u00e1p \u0111i\u1ec7n ho\u00e0n ch\u1ec9nh cho c\u1ea7n c\u1ea9u tr\u00ean cao, bao g\u1ed3m \u0111\u1ed9ng c\u01a1, h\u1ec7 th\u1ed1ng bi\u1ebfn t\u1ea7n, b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n, thanh d\u1eabn \u0111i\u1ec7n, c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 c\u00e1c g\u00f3i \u0111i\u1ec7n kh\u00ed h\u00f3a c\u1ea7n c\u1ea9u tr\u1ecdn b\u1ed9.<\/p>\n\n\n\n<p>N\u1ebfu b\u1ea1n \u0111ang g\u1eb7p ph\u1ea3i s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao t\u00e1i di\u1ec5n, \u0111\u1ed9i ng\u0169 k\u1ef9 s\u01b0 c\u1ee7a ch\u00fang t\u00f4i c\u00f3 th\u1ec3 gi\u00fap ch\u1ea9n \u0111o\u00e1n l\u1ed7i, \u0111\u1ec1 xu\u1ea5t c\u00e1c b\u1ed9 ph\u1eadn thay th\u1ebf v\u00e0 h\u1ed7 tr\u1ee3 n\u00e2ng c\u1ea5p h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 tin c\u1eady v\u00e0 hi\u1ec7u su\u1ea5t.<\/p>","protected":false},"excerpt":{"rendered":"Overhead crane electrical system failures are one of the leading causes of crane downtime in manufacturing plants, warehouses, steel mills, and heavy industrial facilities. Compared with mechanical faults, electrical failures are often more difficult to diagnose because the symptoms can be misleading. For example, a motor that fails to start may be caused by a [&hellip;]","protected":false},"featured_media":11539,"parent":0,"menu_order":0,"template":"single-SEO-Table.php","posts_category":[189],"posts_tag":[768],"acf":[],"_links":{"self":[{"href":"https:\/\/www.kscranegroup.com\/vi\/wp-json\/wp\/v2\/xmxposts\/11538"}],"collection":[{"href":"https:\/\/www.kscranegroup.com\/vi\/wp-json\/wp\/v2\/xmxposts"}],"about":[{"href":"https:\/\/www.kscranegroup.com\/vi\/wp-json\/wp\/v2\/types\/posts"}],"version-history":[{"count":4,"href":"https:\/\/www.kscranegroup.com\/vi\/wp-json\/wp\/v2\/xmxposts\/11538\/revisions"}],"predecessor-version":[{"id":11559,"href":"https:\/\/www.kscranegroup.com\/vi\/wp-json\/wp\/v2\/xmxposts\/11538\/revisions\/11559"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.kscranegroup.com\/vi\/wp-json\/wp\/v2\/media\/11539"}],"wp:attachment":[{"href":"https:\/\/www.kscranegroup.com\/vi\/wp-json\/wp\/v2\/media?parent=11538"}],"wp:term":[{"taxonomy":"posts_category","embeddable":true,"href":"https:\/\/www.kscranegroup.com\/vi\/wp-json\/wp\/v2\/posts_category?post=11538"},{"taxonomy":"posts_tag","embeddable":true,"href":"https:\/\/www.kscranegroup.com\/vi\/wp-json\/wp\/v2\/posts_tag?post=11538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}