Inc Sound Module Decoder - Manual

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If V-start (CV02) is accidentally programmed to a CV value greater than that

programmed for V-mid (CV06), the decoder will force the output voltage for

all steps below the V-mid value to be fixed at the V-mid value. This is done to

prevent undesirable operational effects.

If a value of 00 or 01 is programmed into CV06 (V-mid), the decoder assumes

a “straight-line” throttle response curve. In this case, the decoder will run as

though V-mid were set at a value of 50% of total motor voltage.

V-mid is not available when loadable speed tables are in use.

8.2.5 Simple 3 Step Speed Table Examples

The following are examples of 3 step speed tables you might want to try. Keep

in mind that these are average examples for average locos that are not using

torque compensation or scaleable speed stabilization (Back EMF). Depending

on your particular locomotive, you may need to adjust the values to achieve the

results you want.

TABLE V: 3 Step Throttle Response Curve Examples

Throttle Response Curve Type

V-start

CV02

V-mid

CV06

V-max

CV05

Switcher

Concentrated low speed control. Limited top

speed.

026 038 064

Road Switcher

Prototypical top speed with evenly distributed

speed control over range of throttle operation.

026 048 098

Mainline Locomotive

Quick increase to cruising speed then levels o

to prototypical top speed.

026 128 154

8.3 High Res 28 Step Loadable Speed Tables CV65-95

For a more precise throttle response curve, Digitrax decoders also have avail-

able a 28 step loadable speed table option. With this method, you must program

values for up to 32 different CVs as detailed below. This can be time consum-

ing but you only have to do it once, since the settings will be remembered by

the decoder until you change them. If you have programmed a loadable speed

table into a decoder, you can preserve that speed table when performing a

decoder reset with CV08 by programming CV08 to a value of 09. If you do a

full reset by programming CV08 to 08, the loadable speed table will be reset to

the factory default with no values programmed.