93
Chapter 3
Troubleshooting
■
Guidance on Troubleshooting ........................................................94
■
Safety Precautions ..........................................................................98
■
Troubleshooting...............................................................................99
• Power .............................................................................................99
• Circuit breaker ..............................................................................99
• Power Cable ................................................................................100
• Motor ............................................................................................101
• Brake ............................................................................................102
• Internal wiring .............................................................................104
• Transformer .................................................................................104
• Electromagnetic Contactor, Relay ............................................105
• Fuse .............................................................................................105
• Upper/Lower Limit Switch ..........................................................106
• Push Button Switch ....................................................................107
• VFD ...............................................................................................108
• Interface Board ...........................................................................108
• Braking Resistor .........................................................................108
• Electric shock .............................................................................109
• Friction Clutch ............................................................................109
• Friction Clutch with Mechanical Brake .....................................110
• Hook ............................................................................................. 111
• Load Chain ..................................................................................113
• Load Sheave, Idle Sheave ..........................................................115
• Chain Guide A .............................................................................115
• Gears and Joints .........................................................................115
• Bearing ........................................................................................116
• Traveling motion of the Trolley ..................................................116
This chapter describes the main failure cause and inspection items based on the
fault conditions. The repair work (and maintenance work as well) of the electric
chain hoist is accompanied with disassembling/assembling work. Refer to the
separate “Disassembling/Assembling Manual” for the correct work.
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