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Loksound v5 unable to adjust cv29/becomes erratic with lights or sound on.


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I've tried many times to adjust cv29 and every time it returns to 18. I want to set it to 2 in line with all the other similar decoders. Is there a way forcing it to change?

Edited by LNERGE
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I'm assuming that the problem i'm encountering was caused by my inability to adjust cv29. I have been unable to get the loco to respond to asymetric brake. cv27 is set to 1 and i've fiddled with cv134 endlessly but to no avail.

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I have been fighting this decoder for a coup!e of days now. Sometimes it will stop in abc sections and sometimes not. It appears to be totally random what it chooses to do. I have several other loksound v5's that behave impeccably. 

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  • LNERGE changed the title to Loksound v5 unable to adjust cv29/becomes erratic with lights or sound on.

It's  now had two long session where it has behaved impeccably but without the lights or sound on. As soon as one or both are on it ceases to follow the signalling.

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It does seem to be voltage related. It will skip an abc section when a pair of 76’s with an MGR train is climbing a gradient. It looks like they pull the overall voltage down about 0.5 of a volt.
 

It will run reliably with the sound on. At all does wrong when I put the loco headlights on. The loco has had a shop modification so the tail lamps are on f6/7. It will run reliably with a tail lamp on 

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15 hours ago, LNERGE said:

It does seem to be voltage related. It will skip an abc section when a pair of 76’s with an MGR train is climbing a gradient. It looks like they pull the overall voltage down about 0.5 of a volt.

 

Where are you measuring the voltage, and what with?

 

You should not see any voltage drop anywhere under normal operating conditions.

 

What DCC system?

 

If the voltage drops at the command station/booster output then your system is not up to supplying the current being drawn by the layout. Check whether the power supply input is dropping under load. If so, and the system supports it, replace the PSU with one with a higher current rating. Otherwise, split the layout and add a booster to power half the layout, leaving the remainder connected to the command station.

 

If the voltage drops by varying amounts around the layout, especially on that gradient, then your wiring is not up to the job.

 

Have you created a track bus around the layout with lots of droppers to the track? What sort of wire did you use?

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The voltage is fairly constant at the rear of the Hornby Elite. It is possible to see an increase in current drawn and a mild drop in voltage at the distribution board. This is measured using a Fluke meter calibrated for use on NR. Measurements have been taken with the bare meter and with the recommended 150k shunt. The wiring to each track circuit via each block detector is possibly suspect but every other loco with abc active works perfectly. Of unknown influence at this stage is how much current is drawn by the layout in static condition with regard to rolling stock fitted with lighting and wheelsets fitted with resistors. Hopefully a  job for this evening. 

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Is it possible to swap the DCC output polarity directly at the Elite?

This device is known for sometimes having asymmetrical signal output.

 

It is also strange that other Loksounds behave ok.

Can you swap decoders with one of these locos?

 

Loksounds sometimes have problems to detect asymmetrical ABC signal if

- track voltage is too low (which can happen if load on the Elite is high)

- DCC signal itself is already asymmetrical.

 

Asymmetrical signal can be caused by

- weak DCC amplifier (which the Elite is), and

- asymmetrical load in the locomotive if example one of the lights is not connected to U+ (blue) but instead to chassis or so.

 

EDIT: you mentioned block decoders. Sometimes there can be interference between detector and ABC.

Edited by Hamburger
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I've had a brief play just now. The loco has disc headcode lights and there are four of them. The loco was on course to pass through and abc section with stopping and turning the lights off caused it to stop. I tried this several times with the same result. Leaving them on causes non stop. Would it be possible to reduce the brightness of these four lights to the barest glow?

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