Selecting the Right Magnet
How do I properly and safely size a magnet to optimize the capabilities of my crane?
How do I properly size a magnet to a controller/generator?
For your generator, multiply the volts x cold amps and you will get a kW rating. This number must be below the kW rating of your generator.
– What is DUTY CYCLE and how does it affect the performance of my magnet?
For a 75% duty cycle magnet, the magnet can be operated approximately 7 minutes out of every 10.
Exceeding the duty cycle will have a negative impact on the productivity and life of the magnet.
– What are the main causes of magnet failures and are there tests that I can run to determine its electrical condition?
You can test the resistance with an ohm meter and compare with the nameplate data to determine the integrity/condition of the conductor.
Also take a meggar reading to test for grounding between the coil and case.
Two key components are operator training programs to help crane operators understand the consequences of mishandling/abusing a magnet, as well as developing and maintaining a consistent magnet inspection program.
Operators are the front line defense in preventing premature magnet failures, and if they truly understand the potential consequences of mishandling a magnet, as a scrap processor, they can be your best asset in extending service life.
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