Help needed with Hornby R8247 Acc Decoder

[SLFR]

Hi i have a Elite controller( version 1.42 )and 2 x R8247 the old type decoders. both are doing the same after programming, throws to one side but don't throw back . Have used the simple addressing option group Address 61-64. Point / Accessory no 241- 244 on one R8247 and have tried cv 8 reset , After reprograming on program track then reconnect to main track same thing. P.S using new Hornby points .

[96RAF]

Did you connect a point motor (without a point) to port four of the R8247 when you programmed it. If you set the solenoid to centre of travel when the device completes programming it will throw the motor. The reason for putting it mid travel is no matter how you wired it it will throw one way or the other.

Any reason why you have chosen such a high addressing group. You can have points 1-4, 5-8, etc in parallel with locos running those numbers as the command string is different for locos and points.

After reset by writing value 8 to CV8 the device will be set to ports addresses 1-4.

The obvious thing is have you wired the solenoid correctly, as Hornby and Peco motors use the same wiring colours but connected in a different order.

[Chrissaf]

You are describing a perfect example of crossed point motor wiring.

See the 7th post down in this thread.

Track plan eLink :: Hornby Hobbies

[SLFR]

Yes Hornby point motor (with out point) to port one , Not port 4. Is there a reason why it has to be port four?. Blade on point motor was all the way to right hand side when programming, wiring on point motor was right, Red + Green com and Black - . Reason for higher grouping tried it out of the box first as set by Hornby group adress1 was doing what I describe throws to one side but wont throw back.

[SLFR]

You are describing a perfect example of crossed point motor wiring.

See the 7th post down in this thread.

Track plan eLink :: Hornby Hobbies

 

 

Thanks Chris for that bit of info I have wired the points wrong. I assumed Red + Black - Green was Com. I will try the right wiring tomorrow and let you know how I get on. Thanks so much.

[Chrissaf]

When you reverse the green & black wires. If no improvement or situation is worse, then look at the alignment of the motor relative to the point. Alignment is critical to robust both way operation.

You haven't said which Hornby point motor. The R8014 underboard motor or the R8243 surface mount motor. If it is the R8243 then make sure that you have not overtightened the mounting screws. The screws should just be done up enough to hold the motor in place and stll allow slight movement to be detected by finger pressure. If the screws are too tight, the motor case can be distorted and cause the inner soft iron Solenoid slug to stick.

As per my linked post content. Hornby's choice of using + & - labels is very misleading, these symbols have absolutely nothing to do with voltage polarity. These two terminals BOTH output a negative voltage. R for Right and L for Left would have been a better choice for the labels.

[96RAF]

The reason for hanging a test motor on port four is that when the R8247 has finished programming each port it fires it. Using port four tells you it has completed the whole programming task by firing the last port. The other ports firing don’t deplete the capacitors and possibly interrupt the programming as nothing is connected.

You can program whatever address group you like but there is no advantage in going high if you only have a few points.