soft starting single phase motor

Author	Message
phil99 Guru Joined: 11/02/2018 Location: Australia Posts: 3273	Posted: 01:03am 21 Mar 2026       Something I forgot to mention, if the motor isn't new measure the value of the start capacitor. A few times I have encountered motors where the measured capacitance was much less than the marked value. Worth testing. The reduced starting torque results in a slower start at full mains volts but if the voltage sags with the high inrush it may not start at all. Eg. on a long extension lead it may just sit and hum till the overload trips. Or in your case the inverter shuts down. Cutting open those caps. open found they had 2 or 3 smaller caps inside, with one or two open circuit.