Hooking up VME crate and WIENER Power Supplies ---------------------------------------------- Tools needed: Sockets and/or wrenches: 10mm, 13mm, 17mm 6" socket extension Special Very Flat 10mm wrench Perhaps - 8mm and 11mm (?) wrenches Phillips screwdriver Flathead screwdriver Small wire cutters Parts Needed: +/- 12 and return cable bundles (4 rings per bundle each end) +5V, +3.3V, and return cables (big thick cables, 4 per rack) Sense Wire bundle (25-pin D-Sub connector on one end, bare wires the other) Fiberglass spacers (yet to come from FNAL, description omitted) Small cable ties (6" or so) Large cable ties (9" or so) 4 rectangular fiberglass spacers, each with two holes. These are custom-machined by FNAL to prevent the large power leads from rotating once attached to the power supply and crate. 1) Mount Power Supply in Rack Be sure that the power supply is held into the rack via the standard 10/32 front panel screws. There are 4, Phillips headed. The power supply is also resting on rails to support its weight. 2) Make sure the power posts are secure On the back, the power supply has a post for each cable end, labeled to match the pre-labeled cables. These posts each have a nut holding them in, on the back side of the Power Supply. The 12V nuts are 10mm, the 5/3.3V nuts are 13mm. The posts themselves may rotate in their collars, that fit is not tight. However, the nuts should not rotate independently of the posts. You should not need to tighten them. If you do, here's how: a) Find the black plastic thumbscrews at the upper front corners of the power supply module. These are a few inches behind the front panel of the unit. Unscrew them, perhaps with the help of a straight screwdriver. You can then grab the power module's handles and pull it forward in the rack. b) This revels the side of the posts on the front side of the back wall of the power supply. You can use an 8mm or 11mm(?) wrench to hold the bolt steady while you tighten the nuts on the back side of the wall. c) Push the power supply module to the back of the unit, tighten the thumbscrews. 3) Install the AC power cable a) Take the pigtail end of the power cord and attach the three wires to the power input of the power supply (upper left corner as you look at the back, labeled "MAINS INPUT:) as follows: o Left - "PE" Green wire o Middle - "N" White wire o Right - "LI" Black wire b) Cable tie the power cord to the strain relief bar. Run the cable along the outer edge of this bar, so it does not get in the way when you want to use a socket on the power posts. 4) Mount the +/-12V and return wires: a) remove the outer nut and lock washer (10mm) from each of the 12V posts. b) Put the appropriate cable end ring on the post. c) put the lock washer and nut back on over the ring, tighten down using a 10mm socket on the nut, and the special, thin 10mm wrench to hold the nut that's holding the post itself onto the power supply wall. Be careful that the ring terminals don't rotate such that they touch each other or the chassis. d) Cable tie the wires to the strain relief bar. 5) Mount the +5V and +3.3V and return big thick wires a) See the following pictures for cable routing suggestions (these are printed out and sit in the box with the wires): http://neutrino.d.umn.edu/~numi/PIC00005.jpg http://neutrino.d.umn.edu/~numi/PIC00007.jpg http://neutrino.d.umn.edu/~numi/PIC00008.jpg b) Remove the outer nut (13mm) and lock washer from each post. c) Put the fiberglass rectangles over the posts. One rectangle fits over both source and return for each voltage. Their job is to prevent the cables from rotating - the tab on the end of the cable fits into the rectangles securely once the bolts are tightened down. d) Wrestle the appropriate cable onto the post. e) Put on the lock washer and nut. Use the 13mm socket to turn the nut, holding the first nut still with the 13mm wrench. The angle is poor for getting a good grip on that first nut. f) Be careful that the flanges on the cables don't rotate into each other or the chassis. Use strips of G10 to prevent this if needed. Use the FNAL-supplied fiberglass spacers if available. g) Cable tie the thick cables to the strain relief bar as shown in the pictures, both for strain relief and to help keep them from rotating. 6) Attach the +/-12V and return wires to the VME Crate a) Remove the outer nut (10mm) and lock washer from the 12V posts on the upper-back of the VME crate. The 6" socket extender is very useful for operations here. b) Attach the appropriately labeled 12V cable end rings to the posts. Put back the lock washer and nut, tighten. c) Be careful that the rings do not rotate into contact with each other and/or the chassis. 7) Attach the +5V, 3.3V and return wires to the VME Crate a) Remove the outer nut (17mm) and lock washer from the big posts on the upper-back of the VME crate. The 6" socket extender is very useful for operations here. b) Place another of the fiberglass rectangles over each pair of posts, to prevent rotation of the power leads. c) Attach the appropriately labeled big thick cable end rings to the posts. Look at the pictures for cable routing suggestions. Put back the lock washer and nut, tighten. d) Be careful that the rings do not rotate into contact with each other and/or the chassis. There are chunks of G10 in place to help prevent this, but they are fragile. 8) Attach the sense wires a) Take wire cutters and trim back 1/3-1/2 of the length of each bare wire end, as built they are a bit too long for the sockets. Be sure these ends are tinned for strength, add solder if needed. b) Attach the 25-bin D-sub connector end to the matching socket in the upper middle of the VME's back face. Use a small straight screwdriver to tighten it in. c) Attach the loose end wires to the power supply. There is a long horizontal row, numbered 1-16, of small holes with a which plastic lever on top of each hole. Press the plastic lever back toward the VME crate with horizontal pressure on a screwdriver. These are pretty stiff spring clips! Put the end of the wire in the hole, let the spring clip snap back, and tug to see if it's in good. Use the following map (the wires are twisted together into pairs): Voltage Module + wire, pin - wire, pin ------------------------------------------------------------------- +5Vdc ________ U0 ________+Red -> pin 2 _______ - Black -> pin 1 +12Vdc _______ U1 ________+Green -> pin 4 _____ - Black -> pin 3 +3.3Vdc ______ U3 ________+White -> pin 8 _____ - Black -> pin 7 -12Vdc ________U5 ________+Black ! -> pin 12 __ - Blue !! -> pin 11 c) Cable tie the cable to the strain relief bar.