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Member postings for Jon

Here is a list of all the postings Jon has made in our forums. Click on a thread name to jump to the thread.

Thread: Anyone used an Inverter with a Colchester Student
15/12/2010 23:46:04
Posted by Steve Garnett on 15/12/2010 10:29:30:  It is that most of the inverters have two bits of internal switching that will cause havoc with an RCD; they have a braking mechanism that can switch in a socking great resistor (sometimes external ones are provided for), and even worse, use a system that injects DC into the motor windings when running to achieve additional braking, and on a good system (like Lenze ones), effectively lock the shaft when it's still. The chances are that if the control system braking changes don't trip the RCD when they occur, the DC injection certainly will. And that trip will occur exactly at the point that you really don't want it to happen.
 

Think i am going to have problems in this respect.
I already have trouble starting a 1 1/2hp single ph motor 1 in 3 blows a 13a fuse but never the 20a MCB B type Starbreaker.
 
I now need to run a 3hp 415V motor plus coolant pump etc, non are dual voltage. Took a flyer 6 weeks ago since i was in direct drives area and collected the single to 3ph 220V outputs which they will glady exchange for the 415V output.
30a MCB C type feed 4mm cable ok or do you reckon i will still have trouble?
 
Lastly the electric co changed from 100A fuse to a 65A a few years ago, is this the norm? Hob draws 32A, mill will throw 20A MCB forget the welder slightest touch lowest setting spend more time resetting fuse. C type cure it?
 
 

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