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Post by Deleted on Dec 1, 2006 13:33:13 GMT
What is a lever operation board, and what does it look like?
A it of research shows that they came into vogue around 1961 when the West Kensington IMRs were commissioned, and went out of vogue when the signal frame at Ealing Broadway was modified to become IMR 'WP' in 1974. Were they provided because working the levers in an 'N' or 'V' frame is not normally done?
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Post by Deleted on Dec 1, 2006 15:44:10 GMT
the one at west ken (west) is now the oldest type of LO board in operation and thus has no spares. LO boards are just AND or OR gates and they check conditions i.e points,lever positions to see if the lever required can be released if so it supplys a feed to the NUM's and RUM's
NUM = this is what supplys the feed to the lever valve which puts the lever normal
RUM = this is what supplys the feed to the lever valve which puts the lever reverse
they are usually quite realible but they do not like the heat one bit in the summer the LO board at earls court has 3 fans pointing at it to try and keep it cool
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Post by Deleted on Dec 1, 2006 15:53:14 GMT
the one at west ken (west) is now the oldest type of LO board in operation and thus has no spares. LO boards are just AND or OR gates and they check conditions i.e points,lever positions to see if the lever required can be released if so it supplys a feed to the NUM's and RUM's NUM = this is what supplys the feed to the lever valve which puts the lever normal RUM = this is what supplys the feed to the lever valve which puts the lever reverse they are usually quite realible but they do not like the heat one bit in the summer the LO board at earls court has 3 fans pointing at it to try and keep it cool Interesting. Are they simply a large-scale type of logic circuit then? |
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Post by Deleted on Dec 1, 2006 16:09:58 GMT
very early form yeah its the same as programme machine circuits most of them are just AND or OR gates
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Post by Deleted on Dec 1, 2006 16:12:31 GMT
How does one actually use a lever op board? I'm imagining some kind of large plugboard where you install the gates in a specified setup to drive the IMR levers, in effect creating a non-safety-critical copy of the interlocking that can be triggered remotely.
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Post by Deleted on Dec 2, 2006 1:10:06 GMT
correct
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Tom
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Post by Tom on Dec 2, 2006 18:35:31 GMT
I've got some photos of the Earl's Court and Seven Sisters LOB's, but I can't put them online right now.
I thought the NUM, RUM and UKM came off the scanning read out panels and provided the feeds to the LOB for the route calls? Or is it so long since I last worked on any of this kit I'm starting to forget??
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Post by Deleted on Dec 2, 2006 20:00:31 GMT
other way round tom the NUM and RUM are the final step before the actual valve for the air motor what pushes the lever plus i have just thought of something the sites where we use the LO boards dont use scanning they all thin wire direct from earls court with no scanning strange  west ken east and west hammersmith turnham green (this has slow speed scanning) |
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Post by Deleted on Dec 2, 2006 20:16:30 GMT
Was the failure of the scanning component the reason why services fell over at Acton a few days ago?
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Tom
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Post by Tom on Dec 2, 2006 21:12:48 GMT
No.
Strage that about the NUM and RUM, must check my copies of the Walthamstow NUMs and RUMs that I revised a few years ago.
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DWS
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Post by DWS on Dec 2, 2006 23:20:32 GMT
Was the failure of the scanning component the reason why services fell over at Acton a few days ago? If you look on the Metronet web site, you will see it was the signal main which went down ;D |
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Post by Deleted on Dec 2, 2006 23:55:33 GMT
Was the failure of the scanning component the reason why services fell over at Acton a few days ago? If you look on the Metronet web site, you will see it was the signal main which went down ;D Open mouth, insert foot.  What is the link between a lever op board and scanning? |
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Post by Deleted on Dec 3, 2006 11:55:00 GMT
the scanning just makes the ability to work the site remotely and lets all of the operation of the site and see the visuals (tracks) in the control room slow speed scanning allows 5 functions ABCDE to travel down one line
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