FAQ:QSI Throttle Control Modes

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  • Standard Throttle Control (STC): Percentage of full power applied to the motor is related to the throttle setting (speed step). As power to the motor is constant for a given throttle setting, the speed varies depending on the load. The locomotive may stall at low speeds from minor gear binding, turnouts, and curves.
  • Calibrated Speed Control (CSC)[1]: Power applied to the motor is varied to maintain a constant speed regardless of load conditions. The throttle setting (using 128 speed steps specifies the locomotive’s speed in 1 smph (scale miles per hour) increments. If the throttle is set at 35, the locomotive attempts to maintain 35 smph on level track, uphill and downhill. If locomotives in a consist differ slightly in speed calibration, some do all the work while the others are pulled along.
  • Load Compensated BEMF Speed Control (BEMFSC)[1]: Under BEMFSC, each speed step corresponds to a target BEMF value. The decoder adjusts the power applied to the motor so the locomotive’s measured BEMF matches the target BEMF.
  • Regulated Throttle Control (RTC): RTC combines the best of STC and Speed Control. It is the preferred method when consisting Quantum locomotives together as it automatically equalizes power between locomotives. Like Speed Control, RTC allows locomotive operation at very slow speeds without concern that it may stop abruptly from minor impediments, such as misaligned track joints, tight curves, or rough switches. RTC operates your locomotive as though it is a large mass; the locomotive will resist changes in speed once moving and resists starting up quickly when at rest.

Default is Regulated Throttle Control. See the Quantum DCC Reference manual for more detail. CV = 56.4

  1. 1.0 1.1 These features are not included in Q1 or Q1 multifunction decoders due to patent issues