Same as P1 S21 Series Mtr. Contactor Connects No. 2 and 4 motors in series. Same as P1 TDR Time Delay Relay Delays opening of traction-motor contactor until excitation os removed. T1 Transformer Supplies power for field circuit, field limit and current limit control. Motors WS1-WS2 Wheel Slip Relay Energizes buzzer, lights warning light if wheels slip.
Idles engine in some cases.
Stabilizing - 36.7 ohms Xl, D1,D2 Saturable Reactor Current limit control. Varies a-c voltage in relation to CP voltage drop. D3,D4 Reference point for reactor operation. 50 turns, 0.860 ohm X2 Saturable Reactor Supplies voltage to rectifier R3 to be applied to resistor 152. D1,D2 Increases control accuracy.