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  1. MVRockwell

    starting synchronous motor

    LionelHutz We designed and build our own synchronous control (based on PLC hardware) and DC bridges, upto 11kw (single phase) and 65kW (3 phase), with solid-state discharge resistor switch. You get more information from the links below...
  2. MVRockwell

    starting synchronous motor

    Below is a snippet of a Rockwell white paper outline some of the concerns when applying any soft-starter to Synchronous motors. " Applying soft starter technology to any synchronous machine does require a closer look at the overall impact on the motor and driven load. The key issue, as in any...
  3. MVRockwell

    starting synchronous motor

    You can also check out the links below for complete mv controllers, http://www.ab.com/mvb/1906bbrush.html http://www.ab.com/mvb/1906lbrushless.html Here is are a couple of suggestions for GE SPM alternatives * Allen-Bradley SyncPro * Kinetics Industries (http://www.kinetics-industries.com)
  4. MVRockwell

    VFD on a Synchronous Motor

    Zoobie, As you can see you have a few options and issues. As a drive supplier, like others, we have used VFD on various types of synchronous motors. For your application (9000HP) here are some drives that can work (granted discussion are required with the various vendors)...
  5. MVRockwell

    VFD on a Synchronous Motor

    Dear Zoobie, Synchronous motors with VFD are not necessarily unusual, however they are a little more complicated. What makes things interesting is that synchronous motors have a wide range of designs. For example there are two basic types, brush and brushless. This refers to how DC is applied...
  6. MVRockwell

    4160 softstarters and motors (ex-prf)

    Just a small correction, AB/Rockwell soft-starters do not have motortronic "guts", we have our own. Generally for conveyor applications tach feedback is recommended. However soft-starting a conveyor has greater risk as it is harder to ensure consistent starting condition. You may request a...
  7. MVRockwell

    Using soft-starter for motors with PFCC

    harris1975, If you're thinking of replacing autotransformer starters with a solid-state starter, you'll need to determine why an autotransformer was used/needed. The reason I mention this is that for voltage drop/sag concerns an autotransformer will always be better than a SCR based controller...
  8. MVRockwell

    3330V 50Hz

    You can also try Ferraz Shawmut 5kV class of current limiting R-type fuses. Regardless of who's fuse you request, please keep in mind that most medium voltage motor controller vendors derate the fuse manufacture published ratings. The reason for this is that fuse manufacture ratings are based...
  9. MVRockwell

    Motor Starting Study

    buckeyemurphy, I would still suggest you look at an autotransformer starter. I know this may seem like old technology, but with a 12% voltage drop solid-state soft-starters start hitting their effective limits. When it comes to getting the smallest system voltage drop and still start your...
  10. MVRockwell

    Does Canada have co.s for Heavy duty Drives

    Jraef, Rockwell/Allen-Bradley manufacture medium voltage drives, starters and soft-starters in Cambridge, Ontario, Canada. That is the only place in the world that Rockwell does manufacture MV controllers. From there we ship them to anywhere in Canada, including Alberta, and to the rest of the...
  11. MVRockwell

    Does Canada have co.s for Heavy duty Drives

    Dear Dhaval Shah, Rockwell Automation offers a wide range and full support for Low Voltage and Medium Voltage VFD's. In fact the Medium Voltage VFD are made in Cambridge, Ontario, Canada. You can contact them at 519-740-4100 or www.ab.com/drives. The operator should be able to direct your...
  12. MVRockwell

    Nec

    Let keep this type of comment out. I'm a proud Canadian, and I don't need to prove anything!!!. "...(mostly because Canadians are constantly needing to prove to the world that they are NOT part of the US)."
  13. MVRockwell

    Using Java

    Has anyone started or ooked into using Java to create desktop applications such as those that communicate to PLC's? If so can you recommend a book and tools to use.
  14. MVRockwell

    How to select the correct motor starting method - Overview

    The selection of a suitable starting method for a motor/load combination is becoming increasingly important as additional loads are added to existing utility and distribution systems. In the past, ample capacities were available in the utility networks to support the needs of industry. As well...
  15. MVRockwell

    Response to missing Motor Starting Post

    Hi ScottyUK, Quick question, how do I change this to a FAQ?. I'm still new to this powerful forum.
  16. MVRockwell

    Response to missing Motor Starting Post

    I'm not sure what happened but here is a response to a post on the difference between autotransformers and soft-starters for motor starting that seems to of dissappeared. How to Successfully apply Medium Voltage Soft Starters The selection of a suitable starting method for a motor/load...
  17. MVRockwell

    Timing circuit help

    Instead of a PLC you could you a hybrid PLC/Timer unit. Checkout the Rockwell Pico unit, it "performs simple logic, timing, counting, and real-time clock operations" http://www.ab.com/plclogic/pico/ http://www.ab.com/manuals/cp/1760-um001b-en-p.pdf Approx. cost $150.00 (USD)
  18. MVRockwell

    From Motor Feeder to Transformer Feeder

    Arevaengineer When converting existing motor controller to a feeder controller there are at least four main areas to look at. 1. Control circuit and contactor configuration 2. Current Transformer selection 3. Protection 4. Power Fuse selection The first point is to address the use of the...
  19. MVRockwell

    selecting correct overload relay for motor

    Which AB relays are you using?
  20. MVRockwell

    Synchronous Motor Protection

    From what I understand Fn87 is to measure/trip on a level that is based on a difference. The difference typically looked at is the current going into and out a motor. (I know that sounds very simplistic, I'm sorry) The use of an overcurrent is not what makes it Fn 87, it the way the 3 diff...

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