jummy58
Hi All
First time post need help, I run all Hornby trains and track and control the lay out with NCE Pro Cab 5Amp , the lay out has been running for the last six months all good, We had a derailment last week
when my R3111 Princess Coronation Class City of Edinburgh was going over a Hornby left hand curved point part number R8074 and derailed , this caused the point clip to heat up and melt the track in two separate part of the lay out and lost power too part off the track.

Replaced the clips on the damaged point and still have no power to all of the lay out , is this a common fault or should I replace all off the clips as I have 20 points on the lay out.

Any help would be good as I am new to the age of DCC

Regard
Robert
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Briperran
Im surprised the NCE Pro Cab did not cut out before allowing burn outs on the layout are you sure the procab is working properly cutting out when a short occurs?
As you have no power to the layout first check the pro cab is actually still working properly connect it to a spare bit of track and check with a multimeter or a loco to see if it still working right before going any further.

Brian
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jummy58
The Pro Cab is still working and have tried it out with a loco all is ok and after I replaced 4 clips there is some power too part of the layout not all of it.

Robert
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Briperran
Is it cutting out if you deliberately create a short across the tracks Robert?
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jummy58
Hi Brian,
Just tried your suggesting too create a short across the tracks the Pro cab stayed on and one off the clips melted the track.

Robert
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Bunkerbarge
It sounds like the current trip setting in the Pro Cab is either turned off or set way too high.
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Briperran
jummy58 wrote:
Hi Brian,
Just tried your suggesting too create a short across the tracks the Pro cab stayed on and one off the clips melted the track.

Robert


Robert i believe you have a problem with the Procab as it should cut out immediately as it is at present that is potentially dangerous and could start a fire.
It may be possible to fit another circuit breaker board between the procab and the bus thus ensuring power being cut off when there is a short. Or send the procab away for repair if possible.  I am assuming you have a bus? if you just have rail joiners between tracks joints for electrical connection some of them may be damadged thus your getting only part of the layout working. When one of the dcc concepts team come online they my be able to suggest a suitable circuit breaker or if the procab is repairable. Or ring them on their support line that may well be the quickest way to resolve the problem

Brian
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AHJAY
I actually do not think that the Powerhouse Pro system is faulty.   (Procab is the name for the handset, not the system)

I would probably replace that point to start with.

However a power supply that backs up the overload protection properly (and switches off so the system does not constantly try to re-set power) would be a good idea - such as the Alpha Power.

regards, Ahjay
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Tom G
Once you have found the source of the problem I suggest you divide the layout into power districts using DCC circuit breakers.  This will protect the DCC booster primarily but also track and locos.  The circuit breaker trip current can typically be set at predetermined levels depending upon the manufacturer and depending on the scale of your layout - G scale trip current set much higher than OO / HO scale.

Depending upon the size and complexity of your layout this could be a simple or more time consuming task but the end result is well worth it since you will be able to identify the section of the layout where the short is plus adding protection for your DCC system and motive power.
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jummy58
Just back from the shops had the power supply and hand held tested and all is ok , the man in the train shop Sayed I should fit DCC  circuit breakers
3 off and make 3 different circuits with the power.
Is there any  ones that I should buy our would normal household ones do the job.
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AHJAY
They need to be DCC specific types.

Actually before you do that why not send in your track diagram and we will look at it for you. With respect to the man in the train shop, unless its a large layout 3 is a lot of breakers and may not really be necessary. (after all you already have one in the main system)

Kind regards, Ahjay
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m.bryan
If the short caused the point clip to heat up, then that is indicative of a bad connection at the point clip.
There will be a resistance and it will generate heat on the higher current drawn by the short.
It is also possible that this would delay the short circuit protection on the PH Pro base station.
The PHPro would also try to continually reset - thus generating even more heat.

Regrading being unable to connect power again:
It may be more than the clip that is damaged - the rail where the clip fits could be burnt - thus creating a bad, or no, connection.

Best practice is to solder power feeds to the rails and not rely on the mechanical connection of the clips. 
Similarly, using rail joiners to carry power between sections of the layout is not ideal, as they can become unreliable over time and a similar resistive joint could occur. Again best practice is to solder droppers to each section of rail.

The clips and rail joiners are potential sources of resistive joints creating issues with the speed of response of any short circuit protection system.
Mick
DCCConcepts Tech/Customer support
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