28
Three Point Motor Control
Analysis
Vstart is
Vmid is
Vmax is
Whether the speed steps are set to 14, 28 or 126, the above graph
illustrates how these CV’s control the motor speed. The midpoint is
63 for 126-speed step mode, 14 for 28-speed step mode and 7 for 14-
speed step mode. DC mode is fixed at 126 speed steps.
In addition, should the forward or reverse direction speeds not be
matched, a small correction may be applied to either direction.
allows a small increase or decrease in forward speed while
allows a small increase or decrease in reverse speed. (See
Note that whether operating in DCC or DC, the above CV’s control
the speed of the motor.