Model Railway Forum banner
1 - 9 of 9 Posts

·
Premium Member
Joined
·
6,202 Posts
Hi All,

I would like some advice as to what to do with some locos of a friends which are fitted with sound and run on a layout with a Prodigy advanced squared, the locos start off fine the horn doesnt operate on the function button but the chuff carries on then the horn sounds but cant be stopped.
Bringing the loco to a halt or stop it carries on at the previous speed, could it be a contact issue intermittant ? as the track/wheels were cleaned and still it persists.
 

·
Just another modeller
Joined
·
9,983 Posts
Hello Nick: A broad question which needs information for remote diagnosis. Controller brand really tells nothing useful by itself.

What Scale
Big layout or small layout
Describe the wiring structure for the layout
Does it happen with all locos
Does it happen in any particular part of the layout
Age of layout
Set track or flex
Decoder brand
Power supply brand

Richard
 

·
Premium Member
Joined
·
6,202 Posts
Discussion Starter · #3 ·
Thanks Richard,

I will find out more
 

·
Premium Member
Joined
·
6,202 Posts
Discussion Starter · #4 ·
I got the niformation from my friend this evening

What Scale ................. N Scale

Big layout or small layout ............ Large 80 foot main line run

Describe the wiring structure for the layout ................... one section with three feeding points on main line

Does it happen with all locos ................................Yes

Does it happen in any particular part of the layout ........................... No ... anywhere

Age of layout ......................... Less than 1 yr

Set track or flex ............... All Set Track Kato make

Decoder brand Pre-fitted ............ Athearn Challenger loco, ~ MRC self fitted in Kato P8, ~ Loc-Sound in Bachmann J Class fitted by Digitrains And, ~ ? Can't find instruction book yet! in Kato GS4 {Post modification} Fitted by

Power supply brand ........................... Gauge-master / MRC Prodigy 2

Hope it helps Richard, many thanks.
 

·
Registered
Joined
·
2,342 Posts
Details about filter I'm referring to is as below borrowed from another post

Adding a suppressor / filter/terminator across the end of the track power bus will help: This is a 100~150 ohm resistor of 3 watt or greater plus a 0,1mfd ceramic capacitor in series. 100 ohm is strong filter, 150 ohm is weaker.

Regards Zmil
 

·
Just another modeller
Joined
·
9,983 Posts
*** This certainly looks like communication problems. Test is connect the system to a simple loop of track and see if the problem repeats. Try and let us know

Re wiring: For an 80 foot main line the 3 points are totally inadequate - especially with set track. I would think no more than 4 to 6 feet between pairs of droppers would be sensible.

The use of the term feeders makes me wonder too. does that mean pairs of thin wire from controller to track at 3 points?

The bus on this layout should be following the main line under the board and be certainly not less than 32/.02 wire. If its a long thin layout its getting big enough to consider twisting the 2 wires of the bus at a rate of about 4 turns per foot too in order to reduce inductance. If twisting is too hard (it can be) then just separate the wires by 100mm or more.

The wire weight is NOT a current draw thing - its to do with voltage drop and keeping things in shape bus communication wise.

the Power unit should connect to the bus at the approximate mid point, and ideally the bus should not be a ring. there should be droppers from bus to rails each few feet.

Each end of the bus should be terminated/filtered. The termination/filter should be one 150 ohm resistor (about 1/2 watt) and one 0.10 Microfarad ceramic disc capacitor (sometimes called a monolithic capacitor). The wiring is bus wire 1 to lead 1 of resistor, lead 2 of resistor to lead 1 of capacitor, lead 2 of capacitor to bus wire 2. No component is polarity sensitive.

Until the layout is wired properly there's not much point further troubleshooting really....

Regards

Richard

QUOTE (upnick @ 9 Dec 2008, 09:15) <{POST_SNAPBACK}>I got the niformation from my friend this evening

What Scale ................. N Scale

Big layout or small layout ............ Large 80 foot main line run

Describe the wiring structure for the layout ................... one section with three feeding points on main line

Does it happen with all locos ................................Yes

Does it happen in any particular part of the layout ........................... No ... anywhere

Age of layout ......................... Less than 1 yr

Set track or flex ............... All Set Track Kato make

Decoder brand Pre-fitted ............ Athearn Challenger loco, ~ MRC self fitted in Kato P8, ~ Loc-Sound in Bachmann J Class fitted by Digitrains And, ~ ? Can't find instruction book yet! in Kato GS4 {Post modification} Fitted by

Power supply brand ........................... Gauge-master / MRC Prodigy 2

Hope it helps Richard, many thanks.
 

·
Premium Member
Joined
·
6,202 Posts
Hi Richard,
My friends layout is now sorted after adding more feeder wires, as you suggested and i added his bus wires should form a T shape away from the control following the track route.
Many thanks all once again
 

·
Just another modeller
Joined
·
9,983 Posts
QUOTE (upnick @ 28 Dec 2008, 11:54) <{POST_SNAPBACK}>Hi Richard,
My friends layout is now sorted after adding more feeder wires, as you suggested and i added his bus wires should form a T shape away from the control following the track route.
Many thanks all once again


***Thats fantastic Nick - I'm always delighted when something does the trick & I hope he can now enjoy his layout. He's lucky to have a friend like you close enough to help him.

All the best for the new year

Richard
 
1 - 9 of 9 Posts
Top