There are no rules on setting CV's. Look at
our reviews and you will see DCC decoder CV recommendations. In the early reviews I even drew some nice graphs. These are made on experience and trial and error. You don't expect to see main line locos being overtaken by shunters do you. See the review and comments on the
Class 09 shunter. We studied the speed of the actual loco and tried to equate it to CV values. I think that we sorted it out, but it took some time.
NMRA guidelines do not cover all CV's. For CV54 & CV55, there doesn't seem to be a consensus on use and settings. Lenz uses them for Stopping time in Push-Pull set-up (CV54) and Brightness of A and C Function outputs (CV55). ESU uses them for Back EMF control on their decoders.
With ESU LokPilot and Loksound decoders, the two variables CV54 and CV55 are used to adjust the back EMF effect.
The settings would depend on the specific motor used in the loco.
CV 54 Load control „K“-component of the internal PI-controller. Range: 0 - 80, Default: 32
parameter K Determines how strongly load control effects.
The higher the value, the stronger the impact on the motor.
CV 55 Load control „I“-component of the internal PI-controller.
Range:0 - 80, Default: 24
parameter I Determines the momentum of the motor.
Motors with large flywheels of large diameter require
a smaller value.
From the LokPilot manual:
Adjusting Load control
The load control of the LokPilot V2.0 can be adapted
to different types of motors. The standard settings
match most motors very well but may have to be
adjusted for other models. This is particularly true
for coreless motors (Faulhaber, Maxxon) where we
recommend to set the K-value (CV 54) to a lower
value.
Parameters for Fleischmann
Locomotives with the traditional round motor by
Fleischmann should be programmed as follows:
CV 54 = 14 - 18
CV 55 = 20
Parameters for Märklin® high performance
motors
The 5-pole high performance motor by Maerklin®
(series 37xxx) is best suited for the LokPilotDCC when
programmed as follows:
CV 54 = approx. 20 - 25
CV 55 = 38
Parameters for coreless motors
CV 54 = approx. 4 - 10
CV 55 = approx. 3 - 8