some motors have the six terminal arrangement which allows your motor to be configured in star or delta while on DOL starting
is the 3 phase motor connected to a DOL starter or star delta starter?
many would have the 6 terminal arrangement, which you need for the starter to be able to re-configure the windings from star delta, most larger motors i have worked on would have 12 terminals, becuase they use two windings per phase
It usually says on the motor rating plate what connection should be, IE 240v star (or star symbol), or 415 delta (or triangle). Best have a look at plate and see what it says.
hi spud, dont see where you get the 240V star 415V delta from
If its a three phase motor its 415 from line to line wether its in star OR delta
Thing that changes is the amount of current being drawn
Cant think of an application where a motor would be started in delta
If it its small enough to get away with a DOL (generally about 3kw or less, then it would need to be in star, if it is big enough to need star delta then it would have to start in star
Plus gents, we are assuming its a star delta contactor (ie a squiirel cage motor)
Could be a three phase resistance starter with a wound rotor induction motor
Could be a synchronous reaction motor, could be an auto syncronous induction motor with with banks of contactors switching resistors out (which is entriely diferent to star/ delta)
or it could be a cage rotor, but using a soft starter with a BPC (by pass contactor) and the BPC has failed
could be running of an invertor
either way, he has implied that this something that has 'happened', which is why you could discount any wiring/confuguration faults
my money is its a automatic star/delta running a squiirel cage, and the change over timer has failed
C'mon fella, give us a clue!!!!!
*Shakey rambles off into the distance*