a customer has a table saw with 3 kw 17 amp single phase motor , capacitor start with centrifugal switch (18 years old hardly used)
it worked all the years no problem but lately every time you start it ,it trips the 20 amp breaker.
the motor was tested at the armature winders. no problem. starts easy when the belt is off. i installed a 20 amp slow curve breaker . doesnt trip ,but the 3 phase 45 amp main switch of the house now trips ( with everything else off)
the capacitor was replaced. no difference.
i suggested a new 3 phase motor ,but the mounting bracket is non standard and will be a mission to mount.
then i suggested a ac drive but electro mechanica dont sell them for single phase . they say it messes with the capacitor frequency.
a soft start they sell,but they cant tell me if it will work or not.
i'm surprised it didnt trip before as start up current will be high.
the mechanicals are all fine. blade spins easy.