Post by casey on Apr 20, 2024 2:15:10 GMT -5
Might help others
Every DCC decoder has 3 CVs that will create a custom speed table or curve. These are CV2 start volts and CV range is usually zero to 254 or 255, CV6 middle volts, and CV5 max volts. So you need to know your track voltage, on your basic system For Z 10 to 12 volts is suggested but some systems are 15 volts so for cv2 you want lowest voltage that gives you a smooth start rather than a jump start, so start with the value of 5 and adjust it up or down to get a smooth start, next CV5 your max voltage. I personally use 6 v for the shorties but you can set it lower,or higher, so equation to solve is desired voltage divided by track voltage times the CV max value of 254 or 254, so 6/12x254=1/2x254=127, so 127 is value you set for CV 5. For CV 6 you want half of CV5 or 63, . Now you can play with this as this setting can lower your acceleration in first half of the speed range. A bit more about these values, and how the decoder processes them PWM pulse width modulation. This means that you are not getting pure DC from the decoder to your motor, but a modulated voltage that does not exceed value set by cv 5, but has a pulse duration or width set by speed table across range from CV2 to CV5. in addition you can adjust CV3, acceleration, for how quickly you progress from step 1 to the next step in the speed table like wise CV4 will set deceleration rate. There is a lot more about CVs in your decoder manual. CV is a control variable which allows you to tune your decoder performance to your liking. hope this helps
Information taking from another forum with permission
Every DCC decoder has 3 CVs that will create a custom speed table or curve. These are CV2 start volts and CV range is usually zero to 254 or 255, CV6 middle volts, and CV5 max volts. So you need to know your track voltage, on your basic system For Z 10 to 12 volts is suggested but some systems are 15 volts so for cv2 you want lowest voltage that gives you a smooth start rather than a jump start, so start with the value of 5 and adjust it up or down to get a smooth start, next CV5 your max voltage. I personally use 6 v for the shorties but you can set it lower,or higher, so equation to solve is desired voltage divided by track voltage times the CV max value of 254 or 254, so 6/12x254=1/2x254=127, so 127 is value you set for CV 5. For CV 6 you want half of CV5 or 63, . Now you can play with this as this setting can lower your acceleration in first half of the speed range. A bit more about these values, and how the decoder processes them PWM pulse width modulation. This means that you are not getting pure DC from the decoder to your motor, but a modulated voltage that does not exceed value set by cv 5, but has a pulse duration or width set by speed table across range from CV2 to CV5. in addition you can adjust CV3, acceleration, for how quickly you progress from step 1 to the next step in the speed table like wise CV4 will set deceleration rate. There is a lot more about CVs in your decoder manual. CV is a control variable which allows you to tune your decoder performance to your liking. hope this helps
Information taking from another forum with permission
