Hornby class 153 back emf settings

[Hipwell]

Morning guys.

I recently picked up an old hornby class 153 and have just fitted a locksound decoder to it.

Does anybody have one of these and could share the back emf settings of cv 51 to 56 I can't get the thing running smoothly at all. I've tried the auto config using cv 54, this gets it in the ball park but not brilliant.

It runs OK on analogue. Not the smoothest of runner, but better than it does on dcc.

Regards

[Jupiter 1707822591]

Which loksound have you fitted and does the loco jerk when setting off or stopping .

More detail on what is happening

[Hipwell]

It's a loksound 5 from coastal.

It's starts and stops perfect with cv 51 and 52 on 0.

But say its going down the straight it almost looks as though somebody is apply the footbrake in a car for a mili second.

Cv 54 is on 54 and cv 55 is on 100.

Cv 53 is on 85

[Jupiter 1707822591]

First off you need to service the loco any problems with running on DC will be amplified on DCC.

Could it be a tight spot on the gearing showing this footbrake effect? .

Turning CV 49 bit 0 to 0 turns off load compensation .if you still have a running issue this further highlights a mechanical issue with the loco.

You say there are no issues with starting and stopping

This appears to rule out the k and I settings controlling pid control.

[Hipwell]

I'll give it a go with load compensation turned off.

Managed to get it much better by lowering cv 54, it's almost there but not perfect

It ran fine with a hornby r8249 chip in it.

[Jupiter 1707822591]

If you are happy with CV 54 then maybe tweeking CV 116 to CV 119

The sampling rate of the bemf .probably best to note these values before adjusting.

[Hipwell]

Yeh she's running much better now after a good surface and a small capacitor installed

I don't think the motor or the gearing is a particularly great combo either.

I'll have a play with 116 to 119 to see if I can get it any better

[Fishmanoz]

Just for my curiosity:

Jupiter - CVs 116-119 - adjust in turn in ascending order? And if you end up in a mess, can always reset by writing 8 to CV8?

Hipwell - small capacitor installed - stay alive or RF suppression across the motor? If the latter, not needed? Or something else entirely?

[Hipwell]

A stay alive of my own making.

It's only 2000uf but it seems ti have smoothed out the power delivery and stopped the lights flickering.

This 153 seems really sensitive to even the slightest bit of dirty track

[ColinB]

Surely the best idea is to fix why it doesn't run smoothly on DC before jumping in and changing CV values.

[Hipwell]

Well for anybody else reading, i managed to get the bogie apart enough to get a couple of drops of oil onto the motor shaft behind the worm gear, and she's running perfect now in both directions.

Do these motors have proper ball bearings? Of is it just a shaft through a hole type affair? Which would explain how it's dried up.

[96RAF]

I doubt anything in the model railway world at our scale runs ball bearings except a rolling road.

[Jupiter 1707822591]

Well for anybody else reading, i managed to get the bogie apart enough to get a couple of drops of oil onto the motor shaft behind the worm gear, and she's running perfect now in both directions.

Do these motors have proper ball bearings? Of is it just a shaft through a hole type affair? Which would explain how it's dried up.

Shaft and bushing is the norm .I don't know if they are oilite bushes .

[morairamike]

Aren't they Phosphor Bronze. They dry out usually squeal with it.

[Hipwell]

Ah right, I've seen mentioned the word bearing quite a few times so just assumed ball bearing.

I also race rc touring cars, where every rotating part is on a ball bearing! Fairly new to the model railway hobby.