CV 189: Difference between revisions

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== NMRA CV 23 - Consist Acceleration Adjustment ==
==NMRA CV 189 - Dynamic Brake Min. Speed==
This CV contains additional acceleration rate information that is to be added to or subtracted from the base value contained in Configuration Variable #3. This CV will only affect the momentum when CV19 is a non-0 value, meaning the decoder is configured for advanced consisting. The total momentum value can be calculated using the following formula:
Since Dynamic Brakes lose braking power at low speed this CV can be used to simulate that. The locomotive won't go below the speed (0-126) in this CV when the dynamic brakes are applied.  
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([the contents of CV#23] multiplied by [0.896]) divided by (number of speed steps in use)
 
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This is a 7 bit value (bits 0-6) with bit 7 being reserved for a sign bit (0-add, 1-subtract). The product of this formula is added to the value in CV 3. In case of overflow (CV23 + CV3 > 255), the maximum acceleration rate shall be used (255). In case of underflow (CV3 + (-)CV23 < 0) no acceleration shall be used (0). The expected use of this configuration is for changing momentum to simulate differing train lengths/loads. Consisted/MU's tend to pull/push more cars, and therefore can have simulated higher loads by using this configuration.
''' See Also '''
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*[[{{NAMESPACE}}:Dynamic_Brakes|Dynamic Brakes]]
*[[{{NAMESPACE}}:CV_190|Dynamic Brake Deceleration Rate]]
*[[{{NAMESPACE}}:CV_191|Dynamic Brake Speed Decrement]]
 
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Revision as of 18:26, 5 August 2025

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NMRA CV 189 - Dynamic Brake Min. Speed

Since Dynamic Brakes lose braking power at low speed this CV can be used to simulate that. The locomotive won't go below the speed (0-126) in this CV when the dynamic brakes are applied.


See Also


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