Williams crown sd 45

There are only a handful of wires on the Williams boards.  Since there are several styles, it's hard to be specific without seeing the board.  Basically, it's just the motors and the power pickups.  Some of them have a direction lockout switch, some don't.  There is also an optional connection for the basic sound board on some of them.

I will post a photo tomorrow.  I knew that you would be the one with the info.  thanks again. Bill

Billsrr,

I'd like to chat with you about your SD45. My email is in my profile.

Thank you

Here us the photo of the board.

H

Bill, That is a QSI DCRU.  If you look at the holes the wires are soldered into (near the relays).  You should see markings AC, ACG, M1 and M2.  AC is center rail, ACREG is outer rail.  Since you don't have sound board it doesn't matter which is hooked up to which.

M1 and M2 are motor leads.  A picture of the bottom of the board also would help.

The other 2 wires are probably the lock out switch, but they could be the lights.  I need to see where the wires go.  The lock out switch would go to the header near the blue capacitor.  So a closer picture of that area, and the bottom of the board and we can identify your wires.  G

Yep, it's a QSI board as George says.

I suspect the other wires are lights, I've taken a couple of those out that have lights soldered directly to the board.  I believe this denotes the location of the reverse lockout connections, this was connected to a switch when I took this board out of a brass Williams locomotive.

Here is a pic of the bottom of the board.

Bill, Still can't make it out clearly, but they did solder those black wires directly to the rectifier.

If you remove the brass bracket from the square rectifier you will see markings.  +, - and 2 squiggly lines.  The 2 lines are AC input.  I imagine the wires with terminals go to the trucks for ground and pickup roller.  I think the blue is also attached a terminal on the black and that goes to a light socket?

The + is positive for fwd and the negative is return for the motors.

That is the best I can do for you with those pictures.

This is also an early board with the smaller 4 diodes to make the equivalent of 1 6amp diode.  They were not very reliable boards.  The later version used single larger 6amp diodes.  G

Thanks, I found thing as you said and I presume that both m1 and m2 are used.  How are the motors grounded and how do the lights hookup.  Each light has a diode and the wires length seem to indicate that they connect to either side of the motors. Is that correct?

For directional lighting, one way is to use a diode and connect to the motors, so that's probably what was in this one.

Bill,  Yes M1 and M2 are both used and go to the motor terminals.  M1 is normally + in forward.  So test to see which terminal rotates the motor in the correct direction for fwd.  You will have to test both motors to get them turning in the correct direction for forward.  After that the e-unit does the rest.

The Motor is not grounded per say.  Just gets motor leads from M1 and M2.

Normally direction lighting can be pulled off the QSI board, but that is using 1.5V bulbs.  IF these bulbs are 18V track bulbs, you don't want them attached to the board, but they may be attached at the motor leads as John stated.

Those other 2 black wires coming off the board from the middle.  Are they connected to M1 or M2 traces?  There are 2 holes that connect to M1 and M2.  If so, they used that for motor power for lights via the diode. 

This is an interesting one, I have not seen a diesel wired like this before. 

Williams did use a bracket on the motor mount for AC ground.  I also have seen this used for light ground also.  Hence the terminal with a black and blue wire attached.  G

Thanks I got it running and it will only go forward, what pins do the lock out go and is the normally open lock out the reversing? There is a switch on the bottom of the fuel tank, I presume that is the lock out switch.

I thought NO was the norm, try shorting the two pins I posted previously.

If I remember correctly, the pins go in slots 3&4 reading from right to left of the relays.

Bill

Something like my previous illustration, right?

John,

 I didn't even see your post. The good thing is my memory is not as bad as I thought. 

Bill

Thanks for all your help, the two pins when closed puts the forward reverse in action.  You are the greatest audience with so much expertise and so willing to share information. What a great hobby, it brings out the best.

Yes, it need to be closed to jump power to the logic circuit.  You can skip the switch and put in a jumper like you see on the other header if you want.

Glad you got it working.  Headlights too?  G

Usually the reverse lockout is closed to disable the reverse sequencing on most boards, odd that they decided to do it in reverse.