Author Topic: Need help with a BLI sound decoder configuration  (Read 535 times)

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mecgp7

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Need help with a BLI sound decoder configuration
« on: September 12, 2016, 11:48:55 AM »
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I changed a CV on a dual DCC/DC N loco; CV248 = the start up delay. The factory setting was 20 and I changed it to 1 which reduced the loco's start up time ( don't have to wait for the start up sounds) so that in DC the loco runs like a normal DC loco except that I have to use the upper half of the throttle and I need to start it at almost full throttle to get it to start. Once it gets up to the desired speed (which it does slowly), I back off the throttle. It then responds almost as a normal DC loco, but very high on the throttle.
There are two other CVs that affect DC operation, CV251 and CV252. 251 is the enhanced DC motor control Vmax and controls the voltage at which 100% of track power is sent to the motor. 252 is enhanced DC motor control Vmin which controls the voltage at which the motor will start moving (lower value=lower start voltage). I played with these and only managed to make the loco inoperable.
Would someone explain the relationship of the three CVs? I want the loco to operate like a normal DC loco. Why doesn't lowering both CV251 and 252 allow the loco to run at a lower setting on the throttle and why does it take full throttle to start and then it lets up?
Thanks in advance,
Clint
« Last Edit: September 12, 2016, 05:51:13 PM by mecgp7 »

woodone

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Re: Question for DCC/electrical Gurus
« Reply #1 on: September 12, 2016, 01:13:41 PM »
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Would help if we knew whos decoder you are working with.
I would guess that looking at the CV's you have been working with, suggest that this might be a ESU decoder?

peteski

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Re: Question for DCC/electrical Gurus
« Reply #2 on: September 12, 2016, 03:41:48 PM »
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Judging by his other active thread in the N scale froum, it is a BLI decoder.

None of those CVs are standard CVs - they are implemented specifically by that decoder manufacturer, so a person which will help here needs to knwo the ins and outs of BLI decoders.  Generic DCC knowledge is not very helpful here.

I have couple of BLI sound-equipped locos but I have not really dove into their tuning.

That is a kind of a problem with sound decoders - they all have the basic standard CVs (and utilize most of them), but then manufacturers add dozens of non-standard CVs to suit their individual needs. Those aren't standardized and each decoder is different.

I also think that the subject of this thread should be a bit more informative that what it is now. Something like "Need help with a BLI sound decoder configuration"  Would make much more sense, and attract the right kind of modelers to look at it.

« Last Edit: September 12, 2016, 03:44:01 PM by peteski »
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mecgp7

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Re: Question for DCC/electrical Gurus
« Reply #3 on: September 12, 2016, 06:08:48 PM »
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Judging by his other active thread in the N scale froum, it is a BLI decoder.

None of those CVs are standard CVs - they are implemented specifically by that decoder manufacturer, so a person which will help here needs to knwo the ins and outs of BLI decoders.  Generic DCC knowledge is not very helpful here.

I have couple of BLI sound-equipped locos but I have not really dove into their tuning.

That is a kind of a problem with sound decoders - they all have the basic standard CVs (and utilize most of them), but then manufacturers add dozens of non-standard CVs to suit their individual needs. Those aren't standardized and each decoder is different.

I also think that the subject of this thread should be a bit more informative that what it is now. Something like "Need help with a BLI sound decoder configuration"  Would make much more sense, and attract the right kind of modelers to look at it.
Subject changed. What may seem obvious to many is completely new territory for me when it comes to DCC. I have very limited knowledge when it comes to DCC. I made assumptions about CVs from ignorance. Some of the questions that I had about CVs 251 and 252 (see above) really didn't need to be explained in DCC terms. I figured that lowering the voltage that allows 100℅ of the track power to the motor (CV251) would be allow the loco to start without a delayif the delay was turned off. I also thought that CV252  which controls the voltage when the motor will start moving would do the same if set on the lowest setting (the lower the number the lower voltage needed). It seems to make sense to me, but it doesn't affect the loco that way.
If I have turned off the start up delay, reduced the voltage needed to send 100℅ of the track power to the motor and reduced the voltage needed for the motor to move why wouldn't the loco respond quickly and at a lower voltage?