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Photograph:

🔗79752[linkphoto]79752[/linkphoto][/link]

Looking at the Schematic of the winding gear control, does anyone know what the components to the right (and above) of the the dynamic braking unit heading represent?

Thanks

Sorry Edwyn, when it comes to M&E Engineering then if you don't know, I certainly have no idea! :surrender:

Not wanting to stray too far :offtopic: ....I understand how it works in "power" mode, but my electrical knowledge from college is fading fast....how does it actually work in "braking" mode? That would be a brine bath resistor on the right? A hydraulic servo moves the plates?

The symbol I don't recognise is the one which looks like an aircraft propeller after a crash landing....

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Have a read of this.:)

https://www.edrawsoft.com/qualifying-symbol.php 

Edit: More reading.

https://en.wikipedia.org/wiki/Zigzag_transformer 

Ah.....

A zigzag transformer is a special-purpose transformer with a zigzag or "interconnected star" winding connection, such that each output is the vector sum of two phases offset by 120°. Its applications are for the creation of a missing neutral connection from an ungrounded 3-phase system to permit the grounding of that neutral to an earth reference point and also harmonic mitigation, as it can suppress triplet (3rd, 9th, 15th, 21st, etc.) harmonic currents, to supply 3-phase power as an autotransformer (serving as the primary and secondary with no isolated circuits), and to supply non-standard, phase-shifted, 3-phase power.

....its that old "harmonic mitigation" chestnut again. I should have known!

Yes it actually does make a bit more sense.....it also reinforces the decision I made aged 17 to go into mining and piling rather than electronics. :lol:

Still not sure how the "braking" mode works though.... :flowers:

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Ingenious. I knew I should have stayed awake more in lectures... Enormous help with my 'Biological Recombinant Algorithmic Intelligence Nexus' project... aka BRAIN. World domination just took a giant leap forward.

Thanks all. 😎

Still not sure how the "braking" mode works though.... :flowers:

While the stator magnetic field trundles around following three phases 120 degrees apart, the stator follows. The zigzag transformer apply's an adjustable, shifted angle/current onto two phases creating new vectors, which are behind the rotor so magnetically drawing it back... slowing down.

I'm going to lie down for a while now while someone corrects me;(.