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El ev evator Faul t Fi nd ndi ng ngs … M ititsubi sh shi ( VFCL ) | Engi ne neer For Al l'l' s Blog
Elevator Fault Fault Findings … Mitsubishi ( VFCL ) Fault : Lift is tripped at level and door is closed. Can reset and run a few hours and then fault again. Finding fault step: ( We are checking without computer ) – Check the card LED display ( 29, 89, 60, 4DG, etc) . Found that all is normal. – Check the card supply. It read about 4.9V. So normally can accept. So we decided to replace #5 relay. It is sometime happen this kind of condition. – Before replacing, we try to reset the system. test again with hand speed up and down. At that time, we check again CPU supply voltage because power supply voltage can drop with load. Lucky………. +5V supply suddenly drop to 4.1 V and awhile it back to normal 4.9V. We check again and test a few with auto mode to monitor supply. Correct……… after testing 20 min, supply drop to 3.9V and lift is tripped. So replaced the power supply ( 5V/20A ) and lift run back to norma
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