John D
Hi Everybody,

Just as a background, started collecting the Model Railway Kit 12 years ago.  Started putting track down 8 years ago.  Only just re- started after a long lay off. I am 72 and have to say the electric are a foreign language to me so, please bare with me for asking daft questions.

I am using a Guagemaster Prodigy Advance to control the track and a DCC Concepts Alpha Central to control the Cobalt Digital IP points. I have just installed the first sets of points (two connecting points to change between tracks).  I have followed all of the alterations recommended for DCC points in YouTube i.e. taken out connecting wires, connected the outside tracks and insulated the inside track and connecting track connectors.

Have set up a power BUS for the points taking a lead to each motor and a return and connected the frog lead.to the motor.  Power to the track is via a separate power BUS.

If I connect one frog wire, train will move across with no problem but as soon as I connect a frog wire to each motor, I get a short as the train passes.

Any recommendations please? 
Quote 0 0
Bunkerbarge
Hi John and welcome to the forum.  It sounds like the supply to the frog is from the wrong side.  At the terminals on the IP Digital the two cables that go to the switch that then supplies the frog need changing over.

Hopefully this will resolve the issue.
Quote 0 0
John D
Thanks Bunkerbarge - will give that a try - have given up for today - in lockdown, there is always tomorrow!!!
Quote 0 0
m.bryan
Hi John,
You say you have a separate power bus for track and point motors.
(It's not entirely clear if you have a Central with Sniffer as an accessory bus, or Central is linked to your GM Prodigy using an Alpha Box).
If this is the case (i.e they are electrically isolated from each other) then track power/frog is connected via the S2 changeover switch terminals.

The frog terminal S1 only switches the DCC IN terminals, so will not switch track power if you have two separate buses.

Connect track power to the S2L/S2R and frog to S2C.
If it shorts, then swap over the two feeds to S2L/R
Mick
DCCConcepts Tech/Customer support
Quote 0 0
John D
Thanks Mick,  Will wire up as suggested tomorrow.  Using the Central with a sniffer so 2 independant systems.
You helped me with other bits on email - I was the one that had the wrong power supply and called you Steve!
Once again many thanks - ignore the email I also sent you today. 

John.
Quote 0 0
John D
Hi Mick,  Have done as suggested and moved wiring across to S2L & R and S2C - nothing moves!  Have tried re setting them - nothing.  Move wires back to pwr in and motors move.  HELP.
Quote 0 0
Bunkerbarge
Did you try just changing the two frog supplies over? I am not so sure from the above but am I right in saying the motor was originally working to change the point correctly but the only challenge you had was a short?
Quote 0 0
John D
No, did not change just frog wire. Have blown too many units in the past so very weary of sticking wires in wrong terminals! Will give it a try.
Quote 0 0
John D
And yes, only problem was shorting from the frog when both wires connected.  No short when just one frog connected.
Quote 0 0
m.bryan
John D wrote:
Hi Mick,  Have done as suggested and moved wiring across to S2L & R and S2C - nothing moves!  Have tried re setting them - nothing.  Move wires back to pwr in and motors move.  HELP.


Hi John,
You need accessory power to the motor DCC In terminals from your Sniffer powered circuit. This will control the motor
You will need track power to S2L/R and S2C to frog. This will switch the frog

See the attached diagram.
https://www.dccconcepts.com/manual/cobalt-ip-digital-wired-from-an-accessory-bus/
Mick
DCCConcepts Tech/Customer support
Quote 0 0
John D
Thanks Mick - now have it sorted.  Sorry, did not read your first reply properly but now understand how it works!

kind regards - John
Quote 0 0