91
Chapter 3
Troubleshooting
■
Guidance on Troubleshooting ........................................................92
■
Safety Precautions ..........................................................................94
■
Troubleshooting...............................................................................95
• Power .............................................................................................95
• Circuit breaker ..............................................................................95
• Power Cable ..................................................................................96
• Motor ..............................................................................................97
• Brake ..............................................................................................98
• Internal wiring ...............................................................................98
• Upper/Lower Limit Switch ............................................................99
• Push Button Switch ....................................................................100
• VFD ...............................................................................................101
• HBB Board ...................................................................................101
• Braking Resistor .........................................................................101
• Electric shock .............................................................................102
• Friction Clutch ............................................................................102
• Hook .............................................................................................103
• Load Chain ..................................................................................105
• Load Sheave ................................................................................107
• Chain Guide .................................................................................107
• Gears ............................................................................................107
• Bearing ........................................................................................108
• Traveling motion of the Trolley ..................................................108
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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