CV 6
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NMRA CV 6 - Vmid (Mid Volts)
CV 6 specifies the voltage drive level at the middle speed step (63/126). CV 6 is used to generate a performance curve in the decoder that translate speed step values into motor voltage drive levels, and is specified as a fraction of available rectified supply voltage. CV 6 is used to "slide" the curve in one direction or another, where the value in CV 6 will adjust the curve for greater or less sensitivity in the later half of the speed curve. CV 6 should be left unmodified when setting up "speed limits" in decoders unless you are unsatisfied with the default speed curve calculation.
NOTE: CV6 will not be "in use" as part of the speed curve calculation if programmed with a value of 0 or 128.
CV 6 is used in conjunction with CV 2 and CV 5 as part of the 3 Point Speed Curves feature.
From S-9.2.2 of the NMRA Standards and Recommended Practices:
"Vmid specifies the voltage drive level at the middle speed step. Vmid is used to generate a performance curve in the decoder that translate speed step values into motor voltage drive levels and is specified as a fraction of available rectified supply voltage. Values of 0 or 128 shall indicate that Vmid is not used in the calculation of the speed table."