by Nelson Bay
Mr. Locotester said:
[quote]
EMD’s earliest attempt at wheel slip control was pre dash 2 and called the “IDAC” system (Instantaneous Detection And Correction). Simply put, the motor currents of two motors were compared in opposition and the current of the slipping wheel would drop rapidly creating an imbalance in the circuit. If both motors of the set slipped simultaneously, and the currents remained equal, you could expect divots in the rail along with sparks and smoke.[quote]
Wheel slip control existed on EMD locomotives prior to IDAC. Simply put for sure. IDAC had 3 levels of correction severity. Simultaneous slips were controlled, abruptly, by the overvoltage protection circuitry of the control system.
[quote]
EMD’s earliest attempt at wheel slip control was pre dash 2 and called the “IDAC” system (Instantaneous Detection And Correction). Simply put, the motor currents of two motors were compared in opposition and the current of the slipping wheel would drop rapidly creating an imbalance in the circuit. If both motors of the set slipped simultaneously, and the currents remained equal, you could expect divots in the rail along with sparks and smoke.[quote]
Wheel slip control existed on EMD locomotives prior to IDAC. Simply put for sure. IDAC had 3 levels of correction severity. Simultaneous slips were controlled, abruptly, by the overvoltage protection circuitry of the control system.