TimeTraveller

46 minutes ago, 5BarVT said:

Certainly opposite to the SR.  Confused me when looking at the block switch at Exeter Central as it connected the block line to earth when switched out.  Eventually worked out that it was just a polarity change.

 

WR Standard block circuits show 12V to line (as that’s what the box battery would have been) through a 15 ohm resistor (in case the line goes short circuit).  +12V for Train on Line (red key depressed), -12V for Line Clear (white key depressed).  You shouldn’t need anything near 12V as the indicator is current driven and designed for miles of pole wire or cable in circuit.

 

I’m familiar with C Z L & E on a block bell meaning exactly what Michael said above.  Note that the top coil has L and E as it’s the non-pegging display- just shows what comes in on the line.

 

I suspect that Y and R are connected when the red key is pressed, and A and Z when white.  On a standard GWR block you can’t set LC and TOL together as it’s a single commutator, not sure if some of the extra connections on LC key are to prevent both being sent together.  Test out the keys to see which terminals are connected when.

 

If you could say where the wires disappearing though the backboard go to that might help.  Possibly a ‘bare end’ where they were cut off!

 

Paul.

 

 

Thankyou for your reply.

Just to add the wires going through the backboard I have simply put there so I could connect the coils up to a current while the front cover is on. They don't go anywhere.

Daniel.

10 hours ago, The Stationmaster said:

Do you get any response at all from an indicator when a key is wired to it?   Don't forget they are keys - NOT tappers - on these instruments.

The way I have currently wired it allows for the line clear key to function correctly. The train on line key does allow current to flow through it too.

Hello all.

I'm not sure whether you can help me. I'm hoping you can. 

I have an old block instrument which I'm trying to wire up.

I will attach some photographs to show you what I'm up against.

It a GWR Spagnoletti Up line, Down line block instrument.

I have tested both coils and they both function correctly in both directions. 

What I would like to do and cannot work out is how to wire up one of the dials so it functions when I press either the white or red tapper.

I know it can be done as I've done it on all my other block instruments. I just cannot work out what wire goes where on this instrument.

A wiring diagram would be very handy but I cannot find much out about these specific instruments.

Any advice and help you can give would be greatly appreciated.

Many thanks.