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Discussion Boards => General Discussion => Topic started by: bobv on January 29, 2009, 08:33:39 PM

Title: switching from dcc to dc
Post by: bobv on January 29, 2009, 08:33:39 PM
Hi
Here is a question I haven't seen yet.  I have a new dcc  system and dcc locos.  Since I have mostly older DC locos, I have a way to switch from the DC transformer to the DCC- depending on the locos I want to run.
Question: Once I program a new dcc loco, it doesn't work anymore on the DC power.  Prior to the initial DCC programing, it did run on DC.  Is this correct?
Also, is it bad to leave non operating DCC loco's on a DC track?
Title: Re: switching from dcc to dc
Post by: Jim Banner on January 29, 2009, 11:19:55 PM
Add 4 to the value in CV29 to turn analogue conversion back on.  It sounds like it was accidentally turned off when changing address.
Title: Re: switching from dcc to dc
Post by: Hunt on January 30, 2009, 12:31:42 AM
Are you using one of the MRC Prodigy DCC systems?

If so which one, if not, what did you use to program your locomotive?
What were you trying to program? Address? what?
Title: Re: switching from dcc to dc
Post by: jestor on January 30, 2009, 04:25:45 AM
This happened to me; a couple of locos wouldn't run on DC after being run and CV's messed with on DCC. I went back and set CV 29 to the factory value of 6 and they worked again on DC.  :)
Title: Re: switching from dcc to dc
Post by: bobv on January 30, 2009, 06:31:20 PM
Yes, I am using a new MRC prodigy Advanced2
Do I need to change CV 29 to 6 or 4?
Do I need to do it for each engine?
Also when programmin a loco it asked for an address 1st and then a loco number.  Can I input the road number both times?  Or is the address different from the loco #  .  All programming manuals don't really explain the difference
Title: Re: switching from dcc to dc
Post by: Hunt on January 30, 2009, 09:22:07 PM
During programming of a locomotive address the Alternate Power Source, which is Bit2 of CV29, is disabled by the Prodigy Advance2

Not knowing the current value of CV29 is the reason Jim told you to add 4 to the current CV29 value. Current value of CV29 + 4 will enable the Alternate Power Source, thus allow the decoder to automatically use DC when it is used.

>>>>>

As I advised --- I have deleted from this reply the addition details about MRC Prodigy Advance2 and MRC decoders. The details removed are accurate.
Title: Re: switching from dcc to dc
Post by: bobv on January 31, 2009, 01:25:33 AM
Hunt/all
Thank you very much!  I really appreciate your help.   So it appears there is a difference between Loco address(which refers to the stack) and Loco # (which is its road #) I'll give it a try.