Posted 26 August 2006 - 09:02 AM
Dear jerrif,
I'm convinced that there are different kind of situations, where you could take some risks. This is not the case, I think, this is not a cheap and small motor where such modifications - like a gearbox - can be made (with a risk) withouth the necessary design.
To give you an honest suggestion, we MUST know more details on your application, otherwise we can only give you partial suggestions.
Please collect all info in only one document (you will lose some tens minutes). Motor degree of protection, motor label data (star/delta? frequency? etc.), type of mechanical coupling on the shaft (pulley, plexible coupling, etc.) ambient temperatures, duty cycles, overload sequences, motor insulation, protections, type of application (horizontal, tilting) and type of factory, main cable lenght between soft starter and trafo, etc. ), location (cold mountains, desert), country (for power quality considerations). Historical info will help (how many year ago was installed? etc.)
Such document will be useful to discuss possible solutions without mistakes.
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If you need to have only 180% of first-detachment friction, an inverter need to output something more, i.e. 200 % during starting period. This means that probably you have to select a bigger inverter.
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Is possible that the sudden start will happens because there is some "glue" or "gum" effect between mobile and fixed structure in the conveyor? In this case you have to operate chemically (lubrication, powders, etc.)
Regards
Mario