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Post by Deleted on Jan 28, 2016 23:31:20 GMT
![]() I have in front of me a portion of a rack of contactors. Unfortunately I can't upload photos here but I can describe them as being white blocks a good six inches long being held above a steel bar by L shaped steel bars. There is a small copper contact surface inside each of the white blocks. Are these the main traction control contactors? Does anyone know where the resistance grids were located? Kind regards, Aidan. |
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Post by Deleted on Jan 29, 2016 0:06:58 GMT
Unfortunately I can't upload photos here You can upload photos to, for example, photobucket and then insert them on here. Tutorial. Or, even more straightforward, if you don't fancy that, you can just upload them to, say, flickr and copy and paste a link. |
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Post by Deleted on Jan 29, 2016 0:15:51 GMT
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DWS
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Post by DWS on Jan 29, 2016 9:51:03 GMT
![]() I have in front of me a portion of a rack of contactors. Unfortunately I can't upload photos here but I can describe them as being white blocks a good six inches long being held above a steel bar by L shaped steel bars. There is a small copper contact surface inside each of the white blocks. Are these the main traction control contactors? Does anyone know where the resistance grids were located? Kind regards, Aidan. Are you building a new Tardis for Doctor Who, have you checked the contactors do not have asbestos in the arc shields ? The resistance grids are located on the sole bar under the D stock car. |
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Post by Deleted on Jan 29, 2016 13:21:50 GMT
Anything since 2000 should not have asbestos in a new item and its illegal to refit a item with asbestos since then regardless if the original had this when originally made.
So aslong as them contactors were made after 1999 then your fine and to be double safe don't start breathing in near them if they are broken,cracked or damaged. Just treat it with respect and you will be fine if it contains asbestos and please do not just put them in the normal rubbish only approved waste disposal experts trained in and licensed to handle asbestos can remove them.
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Post by 1018509 on Jan 29, 2016 21:51:24 GMT
They are RPA (rotary pneumatic accelerator) contactors, as you say, traction control contactors and also used for rheo braking. I don't know about D78 but there are about 21 sets of these per motor car on a 73 stock. I've changed hundreds. It's the tips which are changed 2 per contactor forty odd per motor car - a fortune in copper. This is just the RPA never mind the G's, PB's, linebreakers. Sometimes the contactor body including the tips needs to be changed - a pig of a job. Ahhhhhh! retirement is wonderful.
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Post by Deleted on Jan 29, 2016 23:33:17 GMT
They are RPA (rotary pneumatic accelerator) contactors, as you say, traction control contactors and also used for rheo braking. I don't know about D78 but there are about 21 sets of these per motor car on a 73 stock. I've changed hundreds. It's the tips which are changed 2 per contactor forty odd per motor car - a fortune in copper. This is just the RPA never mind the G's, PB's, linebreakers. Sometimes the contactor body including the tips needs to be changed - a pig of a job. Ahhhhhh! retirement is wonderful. Nice details, thank you. Aidan. |
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Post by fish7373 on Jan 31, 2016 0:32:52 GMT
They are RPA (rotary pneumatic accelerator) contactors, as you say, traction control contactors and also used for rheo braking. I don't know about D78 but there are about 21 sets of these per motor car on a 73 stock. I've changed hundreds. It's the tips which are changed 2 per contactor forty odd per motor car - a fortune in copper. This is just the RPA never mind the G's, PB's, linebreakers. Sometimes the contactor body including the tips needs to be changed - a pig of a job. Ahhhhhh! retirement is wonderful. HI 1973 RPA is the same D78 and most of the equipment is the same as the 73. and not to bad to change. 1018509 did you work at northfields i still do. FISH7373 81C NFP |
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Post by fish7373 on Feb 1, 2016 0:37:10 GMT
Unfortunately I can't upload photos here You can upload photos to, for example, photobucket and then insert them on here. Tutorial. Or, even more straightforward, if you don't fancy that, you can just upload them to, say, flickr and copy and paste a link. Still long winded if haven't got photobucket . FISH7373 81C NFP |
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Post by Deleted on Feb 1, 2016 16:46:20 GMT
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Post by Deleted on Feb 2, 2016 11:30:10 GMT
Pretty much!! Regarding the resistance grids, whereabouts on this photo might they be located and do you know what they look like?  Are the field weakening resistors in the same location? Aidan. If you look at the front carriage, imbetween the two bogies there are some grey box covers and a black tube. The resistors are located it a big bank of three sets behind the grey box covers. This is repeated in the undm (8--- numbered car). |
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Post by Deleted on Feb 2, 2016 21:26:50 GMT
Are those the two boxes between the front door and second-to-front door? I presume those are the traction control resistance grids that are switched out for the speed increase? Are the field weakening resistors also located there?
Aidan.
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Post by fish7373 on Feb 2, 2016 22:19:45 GMT
Are those the two boxes between the front door and second-to-front door? I presume those are the traction control resistance grids that are switched out for the speed increase? Are the field weakening resistors also located there? Aidan. HI in the photo you see the side of train is number 1 equipment case with the line brakers and the PBs and the shed box for the overhead trolley lead, the resistance grids are between the center of the frames of the car on the other side of the car is number 2 equipment case with the RPA and field shunts and GI G2 G3 G4 contactors, motor brake switch and forward and reverse switches. FISH7373 81C NFP |
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Post by fish7373 on Feb 2, 2016 22:22:38 GMT
Pretty much!! Regarding the resistance grids, whereabouts on this photo might they be located and do you know what they look like? Are the field weakening resistors in the same location? Aidan. If you look at the front carriage, imbetween the two bogies there are some grey box covers and a black tube. The resistors are located it a big bank of three sets behind the grey box covers. This is repeated in the undm (8--- numbered car). HI the two grey box covers have relays in them FISH7373 81C NFP HI in the photo you see the side of train is number 1 equipment case with the line brakers and the PBs and the shed box for the overhead trolley lead, the resistance grids are between the center of the frames of the car on the other side of the car is number 2 equipment case with the RPA and field shunts and GI G2 G3 G4 contactors, motor brake switch and forward and reverse switches. FISH7373 81C NFP |
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Post by Deleted on Feb 2, 2016 23:15:57 GMT
So in this photo from left to right I can see what look like two document holders jutting out under the second door from the front followed by two grey boxes under the front window - these contain line breakers and PBs (PBs?  ) citytransport.info/Digi/P1240580a.jpgWhilst on the other side from left to right are two grey boxes under the front window again plus one long box under the second door and roundel - this large box contains the RPA (ie the main camshaft that controls series/parallel/field weakening contactors? ). s68.photobucket.com/user/1288gaje/media/Thameslink%20Day-Save/ThameslinkDay-SaveMeet200021.jpg.htmlAnd the traction resistance grids (NOT braking resistors) are right underneath the frame in the middle out of sight? Are there any photos about of the field weakening and traction control resistors about at all? I hope I've understood all of this correctly!! Aidan. |
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Post by fish7373 on Feb 3, 2016 0:57:18 GMT
So in this photo from left to right I can see what look like two document holders jutting out under the second door from the front followed by two grey boxes under the front window - these contain line breakers and PBs (PBs? ) citytransport.info/Digi/P1240580a.jpgWhilst on the other side from left to right are two grey boxes under the front window again plus one long box under the second door and roundel - this large box contains the RPA (ie the main camshaft that controls series/parallel/field weakening contactors? ). s68.photobucket.com/user/1288gaje/media/Thameslink%20Day-Save/ThameslinkDay-SaveMeet200021.jpg.htmlAnd the traction resistance grids (NOT braking resistors) are right underneath the frame in the middle out of sight? Are there any photos about of the field weakening and traction control resistors about at all? I hope I've understood all of this correctly!! Aidan. HI as i said from the front to the second set of doors the two grey boxes with white labels have relays in them, this side of train in photo the large box contain no RPA it is on the other side of the car. there are three banks of grids underneath the frames in the middle out of sight for traction and rheo braking . i will have to see on putting some illustrated parts on here if i can. FISH7373 81C NFP |
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Post by fish7373 on Feb 3, 2016 1:18:51 GMT
 1973 t/stock grid FISH7373 81C NFP |
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Post by Deleted on Feb 3, 2016 17:39:45 GMT
Fantastic! So those huge grids are the ones that get switched out to give speed increase and are also later involved in field weakening?
Aidan.
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Post by Deleted on Feb 6, 2016 21:02:19 GMT
So in this photo from left to right I can see what look like two document holders jutting out under the second door from the front followed by two grey boxes under the front window - these contain line breakers and PBs (PBs? ) citytransport.info/Digi/P1240580a.jpgWhilst on the other side from left to right are two grey boxes under the front window again plus one long box under the second door and roundel - this large box contains the RPA (ie the main camshaft that controls series/parallel/field weakening contactors? ). s68.photobucket.com/user/1288gaje/media/Thameslink%20Day-Save/ThameslinkDay-SaveMeet200021.jpg.htmlAnd the traction resistance grids (NOT braking resistors) are right underneath the frame in the middle out of sight? Are there any photos about of the field weakening and traction control resistors about at all? I hope I've understood all of this correctly!! Aidan. HI as i said from the front to the second set of doors the two grey boxes with white labels have relays in them, this side of train in photo the large box contain no RPA it is on the other side of the car. there are three banks of grids underneath the frames in the middle out of sight for traction and rheo braking . i will have to see on putting some illustrated parts on here if i can. FISH7373 81C NFP Did you have any luck in finding illustrated parts? Aidan. |
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Post by fish7373 on Feb 6, 2016 22:19:36 GMT
HI yes i have them just got to work out how to load them on here.FISH7373 81C NFP
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Post by fish7373 on Feb 7, 2016 23:47:09 GMT
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Post by Deleted on Feb 8, 2016 13:07:14 GMT
Lovely diagrams. Which of frames A, B or C contain the resistors for speed increase control and field weakening?
Aidan.
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