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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...

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...

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)

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)...

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...

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...

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...

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...

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...

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...

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...

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)."

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.

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

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...

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)

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...

Which AB relays are you using?

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...