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  • Users: Ares
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  1. Ares

    Sinusoidal filter on VFD does not cure all

    I belive the impedance and capacitance to ground of the long line results in some sort of resonance with output filter. Isolation transformers "a delta primary star secondary transfomer on the output of the drive" should solve the issue. I would connect the shield of cable to that transformer...
  2. Ares

    electrical feeders for residence

    You may donload a free software (Ampacity Calc.) that calculates the derating from http://www.mc-group.ca/download.htm
  3. Ares

    Cable Pulling

    Proper solution is to use 2000A rated bus. 3 runs of 600MCM would produce voltage drop over 5% and I do not think any arrangment would provide the ampacity you need. Check Underground Ampacity calculator @ http://www.mc-group.ca/download.htm It is for U/G but shows cable configurations - there...
  4. Ares

    Autodesk Building Systems M&E - does it work - are you using it?

    Does any of you use the Autodesk Building Systems for Mechanical/Electrical design. Does the system work in real life? I will appreciate info from M&E designers who tried or is using it. Thank you
  5. Ares

    Processors for AutoCad 2004

    Celeron and the low cost version of Athlon do not have so called math coprocessor which is vital for ACAD.
  6. Ares

    Lisp that draws ceiling grid - like 2'x4'

    Does anyone know where to find lisp that draws ceiling grid - like 2'x4' within a selected entity? Thx
  7. Ares

    Creating a tif image from AutoCAD/Getting good quality?

    Once you select TIF as a printer go to properties (in PLOT dialog box) and set custom resolution as large as you need to get your dpi. I do not now of any limitation the higest I needed was 1600x1200 pixels
  8. Ares

    How to limit variable speed drive power draw

    Thank you, The pre-programmed speed - selected by an contact closure is all I need.
  9. Ares

    How to limit variable speed drive power draw

    During power outage when a 40 HP fan (on a VSD) is on emergency supply I would like to limit its power consumption arbitrarily to 25% nominal to avoid the generator overload. What is the best, foolproof way to do it?
  10. Ares

    ISOLATE A LAYER in 2002

    Create custom icon and use this Diesel string ^C^C_ai_molc;\_-layer;_off;*;;; it turns all but selected layer off. experiment with freeze but you may not be able to freeze the current layer, unless you change the "selected" to "current" first - can be done.
  11. Ares

    NEC CABLE AMBIENT TEMPERATURE ADJUSTMENT

    You may want to check software from http://members.rogers.com/mcgroup/download.htm Or just download http://members.rogers.com/mcgroup/Uground.zip It contains tabulated ampacity values for different feeder sizes configurations, plus ambient and cable temperature rating correction factors that...
  12. Ares

    Lighting calculation, voltage drop

    PS The voltage drop calc from the same site is exceptional http://members.rogers.com/mcgroup/download.htm
  13. Ares

    Lighting calculation, voltage drop

    Try lighting calculator from MC Group http://members.rogers.com/mcgroup/download.htm It is very fast, but no frils. You may try it without registering. There is also some usefull freeware there
  14. Ares

    UPS Battery Types

    Peebee comments are right on Additional considerations should be: -Wet cell usually fails by shorting, failure not trivial to diagnose and may lead to catastrophic failure. -Wet cell may short the UPS electronics if system is not floating (isolation transformers on input and output. -Wet cell...
  15. Ares

    Computer aided cable sizing software

    >Ampacity rating of cable in free air, above grade >conduits with Ambient temperature & corresponding >correction factors Try FREE Ampacity Calculator from http://members.rogers.com/g.cygalski/download.htm OR http://www.execulink.com/~cygalski/download.htm If you like it you will also like...
  16. Ares

    balancing panelboard loads in excel?

    Go to http://members.rogers.com/g.cygalski/download.htm at the bottom of page point to "Last updated...) link and click or use the save us option and download the spreadsheet It is in Excell 2000
  17. Ares

    Hydroforming press power and control?

    Where can I find a good primer on Large hydroforming press motors - related power supply and control issues.
  18. Ares

    Moving robot grounding problem

    Your system does not have to be grounded. Isolate both power terminals from the chassis and monitor if the isolation is maintained. If that isolation is breached shut down the battery. Isolated power cct’s provide the highest level of safety. Power you employ may be dangerous only if a circuit...
  19. Ares

    Lightning grounding conductors

    I hope it is 24 times #14AWG Aluminum is OK. In some countries galvanized steel tape is also used, as long as it conducts electricity, has decent crosssection, it is OK. Steel will not last as long as copper. Make sure all bends in the wire are no less than 12" radious.
  20. Ares

    How To add mouse wheel functionality to VB4 application

    I would like to change numerical value in text boxes up and down by a certain increment using the wheel Are there any scrol OCX.s or other ways of dooing it?

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