Diesel Version 5:CV 112
| |
|---|---|
| Range of Values | 0-255 |
| Default Value | 50 (decimal, 0x32 hex) |
NMRA CV 112 (Beta testing short circuit trip point)
This CV is temporarily used for beta testing and can be hard to understand. Only mess with this CV if you find the decoder talking to you and saying there is a motor or light short circuit when there isn't actually one. TCS is available to help you get this set right. TCS allowed the trip point to be programmable by beta testers because we are assuming not all locomotives act alike and will need customizing. Once we get feedback from the Beta testers we will modify the default values and find an easier way to set this up, thanks for helping us figure out the best values!
CV112 does two things, bits 0-3 allow for more amperage when the motor is running. Bits 4-7 give a baseline amperage level that is active all of the time.
Each value adds .35Amps to the trip point, and the value can go up to 15. giving a total range of 0 Amps to 5.25 Amps.
Example:
Set a trip point of 1.05 amps while idling and an additional .7 amps when the motor is on
I use hexadecimal numbers (because it makes this bitwise calculation easier), on a windows computer open the calculator, then select "view" then "programmer", then select the radio button that says "hex". If you aren't using a windows computer there do an internet search for hexadecimal calculator, or from a smartphone look for a programmers calculator app, or just call TCS :-)
Baseline current of 1.05A / .35A per value = value of 3 in bits 4-7.
Additional amperage allowance when motor is on .7A / .35A per value = value of 2 in bits 0-3.
So set a value of "3" into the calculator first, this gives the baseline current, then enter "2" for the motor draw allowance (shifts the first value over 4 bits). The calculator should now say "32" but remember we set it "hex" mode and our DCC command stations work in decimal only, so set the radio button back to Decimal, the display will now say "50". 50 is the value to program into CV112 to get a baseline limit of 1.05amps and an additional .7A when the motor is on. Additionally the harder the motor is working the higher the trip point will get set by decoder code internally, but you don't need to worry about that.
