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Anonymous Poster #1

Electronic Earthing on EOT Cranes

02/01/2016 11:55 AM

How on an EOT cranes - power earthing and elctronic earthing is made seperate
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PWSlack
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#1

Re: electronic earthing on EOT cranes

02/01/2016 11:57 AM

It is all in the Operation and Maintenance Manual for the equipment. Just look it up.

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TonyS
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Re: electronic earthing on EOT cranes

02/01/2016 2:42 PM

You can provide a separate earth to each piece of equipment but ultimately it will go back to the cranes main earth terminal.
Every piece of equipment is bolted to the crane chassis which forms the main earth.

Why are you bothering?

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JRaef
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#3

Re: electronic earthing on EOT cranes

02/01/2016 4:40 PM

Often in an EOT crane, the controls are run by a festoon cable, where the power is delivered by a bus bar system that has sliding fingers making contact with the bars.

That sliding finger contact is OK for safety grounding, but can cause significant electrical noise on low voltage electronics. So the electronic controls are grounded through the festoon cable. But if the power to the motors is significant, the ground wire required for them would make the festoon cable thick and heavy.

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Andy Germany
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#4

Re: Electronic Earthing on EOT Cranes

02/02/2016 2:28 AM

This also true of sensitive electronic equipment, for just the same reasons....electrical noise.

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BubbleRob
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#5

Re: Electronic Earthing on EOT Cranes

02/02/2016 2:50 AM

Some older cranes just earth through the track/building
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TonyS
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#6
In reply to #5

Re: Electronic Earthing on EOT Cranes

02/02/2016 5:06 AM

That caused us a lot of problems when the powers that be (fitters) decided composite bearing would give better service than the original phosphor bronze.

They were changed back when the drivers refused to get on the cranes and no one would touch the hooks.

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Andy Germany
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#7
In reply to #6

Re: Electronic Earthing on EOT Cranes

02/02/2016 5:20 AM

LOL!!

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TonyS
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#8
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Re: Electronic Earthing on EOT Cranes

02/02/2016 7:08 AM

One of the beasts, the other is hiding behind the camera.

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#9
In reply to #8

Re: Electronic Earthing on EOT Cranes

02/02/2016 7:25 AM

Nice :-) Wouldn't fancy changing the bearings on the end carriages tho, guessing about 250T SWL??
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TonyS
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#10
In reply to #9

Re: Electronic Earthing on EOT Cranes

02/02/2016 3:27 PM

170T but the two could be coupled together to give a 340T tandem lift. The one in the picture being the master.

Each had two cross travel crabs and three hoists. Get it wrong and there was a lot of rope to untangle.

The bogies were changed as a unit. Jack the main body up and wheel the bogie out, no bolts to undo, the whole lot was held together by the weight. The davit arms were then used to lower the bogie to the floor. Our wonderful fitters just had to drop a new bogie off the track as they were supposed to be fitting it, its only 110' down.

Sadly all gone now.

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