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Guidance on Troubleshooting
Chapter 3 Troubleshooting
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Guidance on Troubleshooting
Following table is the summary of the main failure causes based on the failure conditions and their inspection items.
Refer to the page of each item for the check method, treatment and the details of countermeasure.
3
Guidance on Troubleshooting Guidance on Troubleshooting
Conditions Main fault contents Check item
Reference
page
Unable to restart the VFD by resetting with emergency stop
(the case when the VFD cannot be reset even after cool down)
Those related to VFD Check the error code of
VFD referring to “VFD
Manual”.
“VFD
Manual”
(annex)
Electric chain
hoist does not
operate without
load
Sounds no brake operating sound Improper source voltage Power 95
Breakage and burning of
control circuit
Faulty electrical part
Circuit breaker 95
Power Cable 96
Internal wiring 98
HBB Board 101
VFD 101
Upper/Lower Limit Switch 99
Push Button Switch 100
Breakage and burning of
power circuit
Failure of motor or brake
Motor 97
Internal wiring 98
VFD trip due to motor
overheat (electronic
thermal relay)
VFD 101
VFD overheat VFD 101
Sounds brake operating sound Breakage of driving part
Sticking of Bearing
Gears 107
Bearing 108
Electric chain
hoist operates
without load
Does not operate with a load
(Motor sounds howling)
Overload
(Clutch activated)
Friction Clutch 102
Operates slowly with a load Voltage drop Power Cable 96
Electric chain hoist operates in low speed
mode, but does not operate in high speed
mode or operates slowly.
Low source voltage Power 95
Voltage drop Power Cable 96
Does not operate in lowering or in low speed mode.
Faulty Braking Resistor Braking Resistor 101
Operates
differently from
the indication
of the Push
Button Switch.
Operates differently from the indication of the
Push Button Switch
(operates in the opposite direction)
Negative phase connection
of motor lead wires
Motor 97
Wrong connection Internal wiring 98
Push Button Switch 100
Does not operate when operating any one of
the Push Button Switch
Breakage of control
circuit
Internal wiring 98
Push Button Switch 100
Faulty electrical part VFD 101
HBB Board 101
Upper/Lower Limit Switch 99
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