| 摘要 |
A method for operating an electric crane (12), comprises the steps of activating a magnet controller (26) to cause a current to flow through a magnet (14) for creating a magnetic field about the magnet (14) for securing a load (L S, L M, L L) to the magnet (14), receiving a feedback input value (102a) at a logic controller (28) from a device (22, 32a-32c) associated with the electric crane (12), in response to the received feedbac k input value (102a) at the logic controller (28), receiving a command value (104) at the magnet controller (26) from the logic controller (28), and in response to the received command value (104) at the magnet controller (26), modifying the current flow from the magnet controller (26) to the magnet (14) to change the magnetic field about the magnet (14). A system (10 a- 10d) is also disclosed.
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