by Pneudyne
Baldwin’s introduction of an optional compatible control system, including field loop dynamic brake control, was mentioned in a Railway Locomotives and Cars 1954 October article, attached below. The option was said to have been introduced within the last year. It was said that Baldwin units fitted with this control system would MU with EMD units in motoring and braking, and with Alco units in motoring only. That tends to confirm that only field loop dynamic braking was available, not – at that time anyway – the potential wire type.
Presumably the Wemco system used by Baldwin was essentially the same as had been used by Fairbanks Morse in its Consolidation line. As far as I know, in that case, the exciter battery fields were connected in the loop, each being shunted by a lowish value resistor that diverted most of the loop current. But from the viewpoint of the loop, as it were, the shunted exciter field looked like a similar impedance as an EMD main generator battery field.
Cheers,
Presumably the Wemco system used by Baldwin was essentially the same as had been used by Fairbanks Morse in its Consolidation line. As far as I know, in that case, the exciter battery fields were connected in the loop, each being shunted by a lowish value resistor that diverted most of the loop current. But from the viewpoint of the loop, as it were, the shunted exciter field looked like a similar impedance as an EMD main generator battery field.
Cheers,
You do not have the required permissions to view the files attached to this post.