175 motor query

[ClintonHills]

Hi, I picked up a decent ex- college 3 phase 175 on eBay. However I assumed my 2.2 KW converter would be ok for it,based on the Alt saws manuals, however, it has turned up with a 2.2/2.5 KW Aesa motor. It will start on my convertor, but runs backwards, I think due to the convertor dropping phases, it's only rated to 1.5 KW on a single motor (Transwave). I haven't checked the wiring yet/ engage my star delta brain! Does anyone know if this is a standard motor on more recent 175 saws, and anymore theories about its wayward rotation!. Cheers, Mark

 

[CHJ]

Changing rotational direction on a 3 phase motor is just a case of swapping over any two phase wires.

I would not continue to run that motor on your convertor, even if it self protects from any overload it's an undesirable thing to subject your convertor to.

 

[ClintonHills]

Thanks Chas, yes wasn't thinking 3 phase. Of course you are right , I need a bigger converter. Just thought it off that it runs and doesn't appear to be self protecting?. Also I wasn't expecting a motor that big, so I kept seeing it as HP( at least that is my excuse). Checked, and the contractor is full of sawdust and loose wires, but obviously enough to run. Mark

 

[Myfordman]

If/when you swap the wires to reverse the motor, do it on the motor or on the output of the starter/contactor. This will ensure that the control coil continues to be driven from the full 400v and not from the artificial phase supplied by the converter which can cause problems.

 

[ClintonHills]

Thanks Myforman, that was what was happening initially. I sorted out which wire's supplied the coil and it ram much more quietly! I really should have read the convertor destructions more carefully as that as dwhatthey also say. It seems my 175 has been pimped, not sure how common that is? It has a 12 in blade on( very blunt and plastered in resin). On Translates advice, once I shad sorted out the contractor I checked the volts under zero load, and at ' heavy' load. It will start not maxed out (6 vs8), runs at 450 no load, and a lump of knotty oak about 6 in tall, only dropped it to 400 V? I didn't want to push it as it really is that blunt, but doesn't seem heat damaged. Peter at Translate has been very helpful throughout, I think even though it appears to cope I will upgrade to the properly speed convertor. Thanks for all the help, Mark