The Queen Mother

[71mach1]

Hi

I have recently acquired a Class 47 diesel R 319 "The Queen Mother"

I want to make it digital and would like an opinion as to the feasibility of such a project.

 

[Flashbang]

How does it run on dc power? If it has any tendency to stall, not move off correctly at low power or any erratic running then its needs further attention before conversion. Service the loco and motor and retest. If ok convert it, if its still hesitant

 

or at all poor don't convert as it will become far worse on DCC if its a poor runner.

 

Assuming its ok and there are three or more wires on the motor, remove them all. Next and importantly test the two silver coloured brush retaining strips for any connection

 

to the motor bogies wheels. You can do this with a multimeter set onto its OHMs range or use a battery and buzzer and two test leads. Any short (connection) discovered MUST be removed before proceeding. Failure to remove a connection found brush strip

 

to any wheel will result in immediate decoder failure upon placing the loco onto DCC power rails.

 

Once all is 100% proved and there is no connection wheels to brush strips, connect the wire from the rear bogie that went to the motor to the decoders

 

Red wire. Remove the other two wires on the rear unpowered bogie that run to each lamp, these will be reused later.

Connect the decoders Black wire to the metal of the motor block somehow, via a screw loosened and the wire wrapped under the screwhead and

 

retightened or if there was a short link wire between left hand brush strip and motors metal chassis use that wire and join it to the black wire on the decoder, ensure its other end is a good fit onto the chassis. Connect the decoder orange and grey wires

 

to the top of the brush strips, one wire to each strip. Doesn't matter at this stage which way around they are connected.

 

Take the two wires that ran originally from the rear unpowered bogie to each lamp and cut off the any in-line diodes that may be

 

found in each wire, these are no longer needed. Joint the wire from the front end lamp to the decoders White wire. Connect the other ends lamp wire to the decoders Yellow wire. Each lamp now has one connection wire not connected to anything. Join these together

 

ensuring then add to that joint the decoders blue wire. If there is any in line components in either of these wires cut it out. before making the joint.

 

Ensure all jointed wires are securely taped or have heat shrink tubing over them and no bare wires

 

are visible. Locate the decoder and tidy all wires. Don't refit body as yet.

 

Place loco onto the programming track and set its address to whatever is needed from the default 3 address number. Assuming all is ok, place the loco onto the main track, set

 

address number in console and test loco. If it moves in the opposite direction from that shown on the DCC console reverse the orange and grey wires on the motor brush strips. Retest and all should be ok. If all ok now refit the body and your done.

The

 

headlights will come on with F0 and be automatic in direction with a white light for forward movement in either direction.

[Flashbang]

Hi again,

I should have asked.. Which QM loco is it? If its the Virgin livery one then the above will not be correct.

If its the earlier one, then hopefully it's like this service sheet and the above then applies...http://www.hornbyguide.com/service_sheet_details.asp?sheetid=27

 

Sorry

 

for any confusion.

[71mach1]

Flashbang said:

Hi again,
I should have asked.. Which QM loco is it? If its the Virgin livery one then the above will not be correct.
If its the earlier one, then hopefully it's like this service sheet and the above then applies...http://www.hornbyguide.com/service_sheet_details.asp?sheetid=27

Sorry

for any confusion.

[71mach1]

Hi Flashbang

It's not the virgin livery so we're ok so far.

Thanks for your detailed answer, very helpful.

I'll carry out the tests with my trusty Fluke meter and will post my results.

Also ,the feed you sent is now saved .

 

Once again

 

- Thank you