20 is shown a car-wiring diagram for alternating- and direct-current unit-switch control, types 255-H and 251-] switch groups, schedule T-l, with four motors. The change-over switch is operated for direct current as follows: The plug is inserted into the controller cut-out of the lefthand controller. Contact 3+ is connected to contact 8.4, and current flows to 8.4astud 11awire 8acontact point 8 on A.-C. relayanbsp;...
|Title||:||Transmission Systems for Heavy Traction|
|Author||:||International Correspondence Schools|