Author Topic: Loksound V4 cutting Out  (Read 236 times)

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Chinapig

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Loksound V4 cutting Out
« on: June 23, 2019, 05:11:07 AM »
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Hi,
I've an Intermountain cab forward that I'm running on our club layout.  With the help of a powered box car made from a kit by Randgust it's pulling 51 reefers plus a caboose but after a couple of minutes the loco stops working.  The powered box car keeps struggling on.
The loco's lights, bell and whistle still work though.  After a couple of minutes everything returns to normal.
Does anyone know whether this is likely to be the decoder cutting out or the motor somehow refusing to work?  Indeed, can the decoder cut out just on the motor output and not the sound and lights?
If I reduce the number of reefers by a dozen I don't get the problem.
Cheers, Ted
Member of Gosport Model Railroad Club: www.gosportrailroadgroup.org.uk
modelling oNeTrack modules.

Steveruger45

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Re: Loksound V4 cutting Out
« Reply #1 on: June 23, 2019, 09:46:59 AM »
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From what you mention it Sounds like decoder overload protection is kicking in.  What current does the problem loco draw in your scenario?
Steve
Atascocita, Texas

Chinapig

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Re: Loksound V4 cutting Out
« Reply #2 on: June 23, 2019, 10:01:08 AM »
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Hi Steve,
It'll be a while before I can test a train that long again but it does sound like the decoder overload kicking in.  But would that happen and still leave the sound and lights system working still?
Cheers, Ted
Member of Gosport Model Railroad Club: www.gosportrailroadgroup.org.uk
modelling oNeTrack modules.

Steveruger45

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Re: Loksound V4 cutting Out
« Reply #3 on: June 23, 2019, 12:45:52 PM »
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Hi Ted,
I’m not sure on that exactly, but I do believe it would behave as you mentioned if motor was drawing too much current. I say this because similar happened to me once on an old Kato gp50 with a select micro 73800 a long while ago when one of the universals froze up. That little spider thingy in those universals came out and jammed the drive enough for the motor to still spin but the drive train on that end would not turn which overloaded the motor.  I thought I’d damaged the decoder at first but after I fixed the drive train issue, the decoder was ok.  I’m thinking there is some sort of thermal overload device in the decoders motor circuitry that resets when cooled down again.  I’ve never had the same issue again and loco is running great.
Steve
Atascocita, Texas

Chinapig

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Re: Loksound V4 cutting Out
« Reply #4 on: June 24, 2019, 04:17:02 AM »
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Hi Steve,
I'm going to have to test the current draw on the loco next we we set the club modules up.  I don't think I've a big problem I'll just have to limit the length of the train somewhat.  Pretty sure it's the motor part of the decoder that's cutting out.
Cheers, Ted
Member of Gosport Model Railroad Club: www.gosportrailroadgroup.org.uk
modelling oNeTrack modules.

peteski

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Re: Loksound V4 cutting Out
« Reply #5 on: June 24, 2019, 05:29:49 AM »
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How well is the speed matched between the loco and the power car?  If the loco runs faster than the power car, it will be laboring very hard to pull the power car and the rest of the train behind it.
--- Peteski de Snarkski
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jdcolombo

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Re: Loksound V4 cutting Out
« Reply #6 on: June 24, 2019, 09:22:56 AM »
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How well is the speed matched between the loco and the power car?  If the loco runs faster than the power car, it will be laboring very hard to pull the power car and the rest of the train behind it.

Peteski is correct.  The very first thing to check is the speed matching between the power car and the engine.  If they are significantly off, then that could be causing excessive current draw which in turn causes the protection circuits to kick in. 

John C.

Chinapig

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Re: Loksound V4 cutting Out
« Reply #7 on: June 25, 2019, 01:08:00 PM »
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Just had a look at the speed matching.  It was pretty near perfect but I have adjusted the power car from very slightly slower to very slightly faster.  It may make a difference but it will be at least a month before we have our club layout up again so that I can test a train of this length.
Thanks, Ted
Member of Gosport Model Railroad Club: www.gosportrailroadgroup.org.uk
modelling oNeTrack modules.

jdcolombo

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Re: Loksound V4 cutting Out
« Reply #8 on: June 25, 2019, 02:34:58 PM »
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Just had a look at the speed matching.  It was pretty near perfect but I have adjusted the power car from very slightly slower to very slightly faster.  It may make a difference but it will be at least a month before we have our club layout up again so that I can test a train of this length.
Thanks, Ted

Hi Ted.

Remember that the train drag will affect the power car first.  That is, it will have a tendency to run slower even if it is correctly matched to the front engine because it will be bearing most of the initial weight of the train, and with 51 cars + caboose, that's not an insignificant weight amount.  In this case, setting the power car to run a tiny bit faster than the lead loco would be prudent to overcome the train drag.

John C.