| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, in an inverter type crane device, since a connection is different from regular one in the case where a three-phase power source is a reverse phase, even when simple switching is performed in an operation direction similar to a positive phase, any unexpected problem such as damage of equipment may occur in accordance with the configuration of a control device and in the case where the power source is not grounded, there is the risk of electrical shock if a user touches a winch.SOLUTION: The inverter type crane device includes the three-phase power source, a device for winching including a motor for winching, a winch inverter device for controlling operation of the motor for winching, and a detection part for detecting whether any specific phase of the three-phase power source is grounded. The inverter type crane device also includes means for outputting information indicating that the specific phase is not grounded, to the outside in the case where it is detected by the detection part that the specific phase is not grounded. Thus, a grounded phase is monitored in the inverter type crane device and if the phase cannot be grounded, abnormality is reported, thereby preventing the electrical shock. |
