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Re: SD40's to Dakota Minnesota & Eastern

"Rainer Auer" <[email protected] #18 To Bob, Drew et al I appreciate your comments and the descriptions of the workings of P.T.C.. My questions and terms of reference were based on the terminology used in the "Canadian Trackside Guide". These twelve units are upgraded SD40s to SD40-2 electricals, but definitely are not SD40-2s. As to Q-Tron and whatever components they manufactured to enhance the tractive effort of these units, I merely presumed there to be a distinction between their components (as used in the SD40s) as opposed to those used on the SD40-2 units. There were 24 CP SD40s (plus 5 of the ex QNSL SD40s) upgraded to the 82,500 lb. rating. The question then arises, did Q-Tron supply the Positive Traction Control for the 208+ SD40-2s that had their tractive effort upgraded, or was this equipment provided by another supplier? No, I won't bring RaiL...Amer... into the picture. Rainer toggle quoted message Show quoted text ----- Original Message ----- From: Sooke's <keiko@...> To: <C-P-R@...> Sent: May 18, 1999 8:29 PM Subject: Re: [C-P-R] SD40's to Dakota Minnesota & Eastern From: "Sooke's" <keiko@...> Bob and all, One point of interest, Rainer. Q-Tron is an electronics company, based in Calgary, I believe, not the name of a device. And for the record, Q-Tron (yes they are in Calgary) was just bought/obsorbed or otherwise taken over by MPI, Motive Power Industries! Q-tron builds numerous electronic devices used on CPR, including about 90% of the speedometers used on the SD-40s when the original mechanical analogue speedos were replaced, and the Speed Control which controls the speed of the locomotive when the train is loading with coal. As well as the Datacord 6000 Event Recorders, which in fact are a 'black box'. (even RaiLink[oops] uses Q-Tron) The feature you refer to which increased the hauling capacity of the locomotive was known as the PTC or Positive Traction Control. This device replaced some of the Electronic modules used in the -2s and, from what I understand, monitored the amperage going to each traction motor and when the electricity was cut back to a particular traction motor to stop the slipping, the extra electricity was transferred to a motor that was not slipping. You will notice that some units have an 'axle generator' and cable on each axle. Those are the units that have PTC or some form of it. As the axle turns, it 'generates' a pulse/signal that is sent up to the Isolation Amp. From there, the signal can be used for such things as the speedometer, pace setter, event recorder, crew alert/RSC, as well as being able to look at all six pulses and determine when a wheel is slipping! A locomotive with only one or two axle generators would have the older, more primitive relay type of wheel slip protection.

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#18

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