Overhead Gantry Cranes

[Knobhead]

I have never designed crane controls and would not normally get involved TBH, I had not considered what you have said TBH, and it does make sense.
Mind, I have worked on repairing a few where the motors were not "crane" duty as you describe it.

Did you have fun stripping the motor? Took me ages to work out how to get the bearings out of the end bells.

Large crane control is weird, especially Allen West. The first stage resistances are shorted by single pole contactors pulsing in and out in time with the slip speed. Arcs and sparks galore.

Rotormatic control near drove me mad to set up. Again they work on slip feed back to bring in the shorting contactors.

I really wish I took photographs of the panels, they were frightening.

EDIT

Ooopps Just spotted the NOT

 

[Knobhead]

Paul if you have never done crane control not much point commenting lol

Joel,
That was uncalled for.

 

[joel89]

ok sorry Paul, they're all on 10 x 38 fuses. same with cross travel and long travel but they're on inventer's so will have thermal trip on the inverter's cheers for telling me that tony, they also have a master contactor on the hoist circuit guessing thats a fail safe system?

 

[Knobhead]

The master contactors will be for top over wind.