DREU reverse unit wiring connections for AC motor

The motor and power connect to the 6-pin black molex plug.  You can buy this harness from Lionel with the pins already inserted.

6 PIN MOLEX HARNESS / ACMC / SINGLE MOTOR

The also have this one.

HARNESS / 4-POS / BATTERY & LAMP / ACMC

gunrunnerjohn posted:

The motor and power connect to the 6-pin black molex plug.  You can buy this harness from Lionel with the pins already inserted.

6 PIN MOLEX HARNESS / ACMC / SINGLE MOTOR

The also have this one.

HARNESS / 4-POS / BATTERY & LAMP / ACMC

John

Do you know how each of the 6 pins of the DREU are connected to the Pumore Motor and is the DREU powered by AC or DC source.  I have a DREU board and trying to use it to replace a mechanical e unit .  If the DREU is fed by DC,  then I will most likely get a Dallee electronic E unit, but was just trying to use the DREU I already have.

Thanks,

Bob D

You have an AC part there, if it were DC the black plug would only have four pins.  When you turn it over, is there some stuff silk-screened by the connectors identifying the connections?  Many Lionel boards have this.  I don't have one of those to look at right now.

Typically blue and yellow go to brushes and green to field.  The other 2 are AC input.  Gray center rail.  The sixth is a jumper.

Not all 6 pin motor drive units are AC though.  In your case as long as no bridge rectifier on the board it is an AC board.   Plus it is an AC MC.  G

I don't think something labeled the ACMC would be running DC George.   I agree that the Odyssey I boards had six contacts, but we're a ways from those.

GGG posted:

Typically blue and yellow go to brushes and green to field.  The other 2 are AC input.  Gray center rail.  The sixth is a jumper.

Not all 6 pin motor drive units are AC though.  In your case as long as no bridge rectifier on the board it is an AC board.   Plus it is an AC MC.  G

G 

The sixth lead is a jumper for what?  What do I jump?

John & G

Of the 3 connectors on the ACMC/DREU board, I now have info for two of the 3 connectors.  Does anyone know what the third White 2 pin connector is used for.

Thanks for all your help,

Bob D

gunrunnerjohn posted:

I don't think something labeled the ACMC would be running DC George.   I agree that the Odyssey I boards had six contacts, but we're a ways from those.

That is what I said.  So yes.

rad400 posted:

 

 

GGG posted:

Typically blue and yellow go to brushes and green to field.  The other 2 are AC input.  Gray center rail.  The sixth is a jumper.

Not all 6 pin motor drive units are AC though.  In your case as long as no bridge rectifier on the board it is an AC board.   Plus it is an AC MC.  G

G 

The sixth lead is a jumper for what?  What do I jump?

John & G

Of the 3 connectors on the ACMC/DREU board, I now have info for two of the 3 connectors.  Does anyone know what the third White 2 pin connector is used for.

Thanks for all your help,

Bob D

 

 

Just the 5 matter.  Do you have harness?  G

GGG posted:

rad400 posted:

 

 

GGG posted:

Typically blue and yellow go to brushes and green to field.  The other 2 are AC input.  Gray center rail.  The sixth is a jumper.

Not all 6 pin motor drive units are AC though.  In your case as long as no bridge rectifier on the board it is an AC board.   Plus it is an AC MC.  G

G 

The sixth lead is a jumper for what?  What do I jump?

John & G

Of the 3 connectors on the ACMC/DREU board, I now have info for two of the 3 connectors.  Does anyone know what the third White 2 pin connector is used for.

Thanks for all your help,

Bob D

 

 

Just the 5 matter.  Do you have harness?  G

G

I don't have the harness, but John provided info for the harness in his first response which I will order from Lionel 

thanks,

bob d

I think you'll find that you only have five connections to that board with the black Molex connector, the 6th will be empty.  I don't remember what the 2-pin connector is for, probably the reverse lockout switch if I had to guess.

I bought this board and the mentioned cables to run a PW FM Train Master. Had some problems getting it hooked up, my fault. It works as it should but the MOSFET’s get VERY hot. After about 5 minutes of running, not pulling any cars, the MOSFET’s get so hot, you can’t keep your finger(s) on them. The motors on the FM are extremely free spinning and require very little voltage to get it moving with a mechanical e-unit. The board is shown to be for a two (universal) F unit look. Any ideas what would cause this or is this the nature of how this works? FWIW, I ran the FM for about 10 minutes and pulling 4 postwar cars. The board did not fail, but got very hot. The aluminum heat sink, was even untouchable.

 Thanks 

Steve

Sounds like the motors are drawing excessive current.  First stop is to monitor the current to the track and see why you're pulling so much power.

gunrunnerjohn posted:

Sounds like the motors are drawing excessive current.  First stop is to monitor the current to the track and see why you're pulling so much power.

John, (I'm not challenging your knowledge, just trying to understand the physics, etc) so, if the motors are fairly free spinning and take very little current to get moving with a mechanical e-unit, that doesn't necessarily equate to a low amperage draw?  I also thoroughly disassembled both motors, down to the bearings and everything and cleaned and lubed, etc. The one thing I just thought of:  if the motors don't run at the same speed, IOW sort of working against each other could that cause and excessive power draw?  Seems likely but it would seem one would have to be way out of sync with the other.

Thanks,

Steve

Obviously, something is drawing excessive current to heat up the triacs on that board.  It's possible there's a wiring issue or one of the parts on the board is defective.  The motors not running at the same speed normally wouldn't have much of an effect if they're not binding.  It's normal for the two trucks not to be perfectly matched.

gunrunnerjohn posted:

Obviously, something is drawing excessive current to heat up the triacs on that board.  It's possible there's a wiring issue or one of the parts on the board is defective.  The motors not running at the same speed normally wouldn't have much of an effect if they're not binding.  It's normal for the two trucks not to be perfectly matched.

I bought two of the boards.  I didn't think to try the other board. Darn.

Thanks,

Steve

Is the board mounted on the heat sink?

FYI, there used to be an ACRU, made just for these.  I replaced all my E-units with these back around the late 80's.  Worked much better & quieter

If you want the pulmor motor direction to respond to the DC polarity of the DREU unit, use the following diagram. The DREU output should connect to the track power input point in the diagram.

Warning! The DREU reverse boards are not built to handle power requirements of a Pulmor motor.  As already noted, they get very hot to the point they melt the solder on the board. A Pulmore motor takes 1-11/2 amps each, and that board cannot handle 3 amps.

RoyBoy posted:

Is the board mounted on the heat sink?

Yes.

Chuck Sartor posted:

Warning! The DREU reverse boards are not built to handle power requirements of a Pulmor motor.  As already noted, they get very hot to the point they melt the solder on the board. A Pulmore motor takes 1-11/2 amps each, and that board cannot handle 3 amps.

FWIW: after some extensive research on the Lionel parts web site, 691-ACMC-103, is listed as being used in multiple 2 universal motor loks. Specifically, a number of F3’s and a couple of GG-1’s.  When I saw them listed for the GG-1’s, I started to have doubts. (Past experience with GG-1’s and ERU’s prompt me to say that) Chuck, I agree with you.  However, the 691-ACMC-103 is also listed as being used in a number of single universal motor units. I would think this ERU could handle a single universal motor. Or, Chuck, do you speak from experience?

Steve

A  ACMC will work for a AC Pulmor motor. A DREU board  is too light duty for Pulmor motors.

Check your email. maybe the spam. There were hyper-links included that may have filtered it to spam.

I've done some more research and wonder if one you guys would render an opinion.  I've found a  PWC FM with a different type of ERU.  Product link: https://www.lionelsupport.com/...b5-9f08-a359193a3030

Once there, please look at part sequence number 4.  

Do one of you guys think this will work?

Thanks,

Steve

ps: I was able to find the wiring diagram for an FM using this board. It is in supplement 45.  It cleared up some questions.

That driver board will not work as a stand alone. Must be used with a radio board.