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Recent content by drjorde

  1. drjorde

    MTL SD32X Grounding

    I don't know how to do that. The search I did, turned up a closed thread on the same subject. So I just clicked on start a new thread and it placed it here. This is not power related. it has to do with grounds and very low level signals. Dave DrJorde http://plansbyjorde.tripod.com
  2. drjorde

    MTL SD32X Grounding

    This ground would not be energized unless there was lightning or other electrical surges. We have over 300 EE's here and they have 3 different solutions. That is why I came here to find an expert in Surge protection. WE have been using these for years and I suspect they have been grounded to all...
  3. drjorde

    MTL SD32X Grounding

    This device has a common ground with the Din rail when mounted on it. We isolate this din rail in our Turbine Control System. The question I have is where is the best place to take this din rail to ground? 1. IE where we have shields from many 4-20 devices terminated. 2. FG which in our case is...
  4. drjorde

    DC relays capable of 150Vdc & 3Amps?

    RoHS and WEEE which are being adopted by California as SB20 Jan 1, 2007 will pohibit the use of mercury. AB has an office in my department and we are, I think, their biggest account worldwide. Anyway, they have not been able to step up to the plate on this either. I need a SSR manufacturer...
  5. drjorde

    DC relays capable of 150Vdc & 3Amps?

    Skoggs I need 420 watts in extreme cases. We are looking at using 3ea 140 watt heaters in parallel with a single TC and Relay or thermostat. The heaters are running on 120 Vdc, but the Charger when it kicks in goes up to 150Vdc, hence the high limit. This equates to almost 3Amps at that voltage...
  6. drjorde

    DC relays capable of 150Vdc & 3Amps?

    I won't go into all the details, but in short EP boxes are not possible. Being a World class supplier of Turbines with on-skid controls means we have to have all the certifications. On-skid controls don't work in -40 deg F weather. I need to be able to heat these boxes to at least 0 deg F in...
  7. drjorde

    DC relays capable of 150Vdc & 3Amps?

    I am searching for an ATEX and CSA/UL approved thermostat or relay capable of switching 150Vdc at 3Amps. We have an application that can only use DC and needs to comply with these certifying bodies. The relay must either be hermetically sealed or solid state. DrJorde http://plansbyjorde.tripod.com
  8. drjorde

    Pump, Valve and Fitting Graphics?

    I am designing a pond/waterfall, filtration and circulation system for myself. I would like to do it in Autocad with the proper graphics. Does anyone know where I can download free dxf or dwg files for this purpose? DrJorde
  9. drjorde

    Weight Estimation

    Calculate your cubic inches of material (Height X Width X thickness) and multiply that times the density in Lb/Cu In. For example the density of most Aluminum is .10 Lb/in3. So a 2X3X2" block would weigh 1.2 Lbs. The density can be looked up in any Machinist handbook, your material supplier...
  10. drjorde

    I was recently hired as a production engineer for a factory which desi

    I have been in manufacturing for 36 years. There are no ideal solutions/programs for performing estimating. As a former estimator, I can say, use your favorite spreadsheet program and break down each completed assembly into individual operations. You can establish material cost, handling and...
  11. drjorde

    Pressing Bushings

    Consider using LN2, then you won't need a press or fancy fixturing. In tooling, with a nominal .0003-.0005" pressfit bushing, a few minutes in LN2 allows it to fall into the hole. There is little opportunity for the bushing to "cock" in the hole or "shear" the sides of...
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