Momentum
The delay in starting and stopping the motor is called momen-
tum or acceleration and deceleration delay. It is generated by
the microprocessor. You turn the throttle from 0 speed to 50%
speed and the microprocessor tells the motor to go 0%, then
1%, then 2%, etc., until it reaches 50%. The quicker these com-
mands to the motor are sent, the less the momentum.
Stopping works in reverse: 50%, 49%, etc.
Emergency stop removes the delay: 50% goes directly to 0%.
Function Driver and Lighting Functions
The function driver switches full voltage to the function pads
or wires. It doesn’t have to work with reversing the polarity, as
the motor driver needs to do.
10
10: Function Driver equivalent circuit with an external
bulb or 12 volt LED – rear (yellow) function shown.
DCC Impulses Column - 7
MRH-Feb 2013
