Looking to DCC my little MU2 switcher and it's not happy, no light. Using a cheapy Digitrax DH126. Might swap out the decoder for another DH126 on another loco just to check that it's not the decoder. Need to triple check the wiring, but things look OK. Has anyone DCC'd anything MU2 powered? It may just be oxidized wheels even though they look clean.
I'll snap pics tonight for the red and black wiring for power pickup.
Did you perform a stall test first? If you did what reading did you come up with?
I believe the 126 is a 1.25 amp decoder.
You say there is no light. Is that the only problem?
The problem as I see it; trying to DCC an MU-2 will be difficult because you MUST totally isolate the motor from track power. With an MU-2 getting power through the same metal motor case as the wheels/pickups run through I think you will have trouble.
It seems the only way to do this would be to insulate the motor truck from the rail and use the other truck with different axles to be able to use wheel wipers to pick up both rails.
Doing that would then cause intermittent pick up for sure.
Last Edit: May 17, 2019 8:30:13 GMT -5 by rbturner
Randy; operating the Vicksburg & Eastern Railroad.
You say switcher. Is this a 2 truck loco or a centrally mounted MU-2?
If you keep in mind that the motor MUST be totally isolated from track power while doing the install it is actually pretty simple.
2 wire in to the decoder and 2 wires out to the motor.
Once that is done I usually sit it on the programming track and do a address read back. If your work is OK then you'll get a read back. If not, you won't. Doing this simple test on the programming track can save you the cost of smoking a decoder by testing on the main.
Generally, there isn't enough power available on the programming track to burn up anything.
Last Edit: May 17, 2019 8:57:14 GMT -5 by rbturner
Randy; operating the Vicksburg & Eastern Railroad.
Post by NickelPlate on May 17, 2019 9:35:53 GMT -5
To isolate the motor on an MU-2 all you have to do is slip an insulator over the brush spring on the grounded side, then solder one of the motor control wires to the brush itself. You could also cut through the brass lug on the brush mounting plate that grounds the brush to the frame. The screw that holds the brush plate is a good spot to secure one of the track power wires for the decoder; the other goes to the wires from the pickup wipers.
methuener: My wife is always mad at me...Sixth day of 90+ heat today. A cool down is finally arriving tomorrow.
Jun 9, 2021 15:09:28 GMT -5
rbturner: Jim, when my wife gets 'fussy' with me I tell her; "play me or trade me-don't sit me on the bench".
Jun 10, 2021 9:51:11 GMT -5
umpdan31: Jim, if I told my wife that, I'm afraid she'd trade me. After all, she's 9 years younger than me.
Jun 10, 2021 11:29:25 GMT -5
JNXT 7707: Looks like it's going to be 90+ here in Buzzardly until October
Jun 10, 2021 16:44:08 GMT -5
rbturner: But it's a dry heat.
Jun 10, 2021 19:20:23 GMT -5
JNXT 7707: Actually it's a jungle heat, straight up from the Gulf. John gets the dry heat out west.
Jun 10, 2021 22:24:30 GMT -5
John: It was a cool Wet Spring, but is was 102 this week. The rain Delayed the Cotton Planting!
Jun 10, 2021 23:30:20 GMT -5
TK Dave: It's been gorgeous and hot the last few days. Today, I'm freezing my gheezah off again, at 59, and the high will only be 67. I'll take 80, 90, 100 any day.
Jun 11, 2021 5:35:58 GMT -5
umpdan31: I'm totally with you on that, TK Dave. I've always told people if you don't like the weather here, just wait.
Jun 11, 2021 7:26:58 GMT -5
JNXT 7707: That explains a lot about the both of you. Lizard DNA
Jun 11, 2021 14:18:45 GMT -5
dastumer: We’re wearing T-shirts when it gets above freezing up here. 59 is plenty warm!
Jun 11, 2021 17:10:37 GMT -5
ZeldaTheSwordsman: I prefer cooler. Too much heat does to my brain what leaving a soldering iron on it does to a plastic frame.
Jun 11, 2021 18:13:49 GMT -5
ZeldaTheSwordsman: Track erasers... There's a thing that's the same but not specifically branded for model trains, right?
Jun 11, 2021 18:15:04 GMT -5
dastumer: The bright boy is made by Walthers. One would last you several lifetimes. I never really use mine, I just go at the track with a rag and some alcohol to get the gunk off, and run a track cleaning car when it gets bad. I rarely need to clean track though.
Jun 11, 2021 20:27:34 GMT -5
ZeldaTheSwordsman: Well, my track is in dire need of cleaning and I've tried rag-and-alcohol.. Didn't make much of a difference. What I was asking was if there was an equivalent to the Bright Boy that you could buy in a regular department store.
Jun 11, 2021 22:24:54 GMT -5
umpdan31: As far as I know, track erasers are designed for model trains. I got mine at a LHS.
Jun 11, 2021 23:41:23 GMT -5
JNXT 7707: I don't know of any Bright Boy equivalent out there. Maybe one of those dish scouring pads?
Jun 12, 2021 7:18:00 GMT -5
TK Dave: ZeldaTheSwordsman, if it's general crud on the track, try ammonia on a rag. I've been able to remove thick, cigarette build up from tracks using it. If the track needs to be shined to clean metal, I use 3M dish pads, available at supermarkets
Jun 12, 2021 7:27:31 GMT -5
TK Dave: then vacuum afterward.
Jun 12, 2021 7:27:39 GMT -5
rbturner: Peco makes the best track eraser I have seen. Life-Like makes one too but it isn't very nice. For cleaning I switched to mineral spirits after reading the science about it on the MRH forum. It has to do with poplar and non-polar solvents leaving residues.
Jun 12, 2021 16:27:07 GMT -5