| Subject: |
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D stock refurbishment |
| Name: |
|
D.Butler |
| Date Posted: |
|
Feb 8, 05 - 10:41 PM |
| Email: |
|
CHOPPERTUNE1984@aol.com |
| Message: |
|
Just a few views on the D-stock refurbishment....cosmetically bombardier have it spot on. its a new train, it has fantastic ergonomics in the design for driver and passenger....From an engineering point of view i feel there is a flaw. An additional 600v supply is taken off the auxilary fuses on the DM. Then fed through a new intercar jumper to the trailer car where it supplies a rather bulky 600VDC/415 3 phase AC converter. then the AC is supplied back to the DM via another intercar jumper to a huge air con unit in the ceiling directly above the J door. and the benefactor of this is just the driver with cab air conditioning?? Astonishing from a private firm like bombardier looking to obviously make money back through highher ambience scores and better customer survey results......If they goto such extreme for air con why doesnt the entire unit benefit from it (i.e passengers also) imagine a hot day when a train sits down in a tunnel and a passenger alarm is pulled..when the driver opens his J door to go reset the alarm and theres a blast of cold air whats the customer going to think then? I have spoke to bombardier and spitfire at Ealing common and they have been unable to provide an answer. will let you know on here when i get one. Also as i undertstand it with these additional components the Variable load control valve settings are going to have to be adjusted too as the tare weight has been increased. Im not complaining just because i am depot staff but as a qualified engineer to HND standard i have studied buisness management in engineering, surely cost outweighs return when you take into account man hours, materials etc. This is what prompted me into posting this. i believe also with the 3 phase AC there was an issue with signalling interference, although i'm not sure of the frequency. As you maybe aware Motor alternators output 230V single phase Ac at 850Hz, this is a very high frequency so does not interfere with the signals.....but i assume bombardier done their homework on signalling frequencies when they planned to install the 600VDC/415 3phaseAC converter....email me if you want anymore more info on technical detail. One last thing i spoke to the project liason manager today 8/2/2005 and he said train 2 was due out today, but it didnt venture out..all planned depot maintenance bar 14 daily exam and 24hr prep have been carried out |
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