What is the starting current in star / delta connected motor?

Answer 1

that depends on the parameters of the coils

a starting motor always needs a lot of current to build up magnetic fields around the coils.
while in star configuration the coils are connected between phase and neutral which means the current by given resistance in the coils is lower than connected in delta configuration without neutral.
therefore the starting current which can be a multiple of the operating current is reduced by reducing the voltage using star configuration.
once the motor is running older non-electronic circuitry switches the coils in delta configuration, which enhances the current in the coils.
if you would start the motor in delta configuration it would possibly blew the fuses cause the resistance of coils without a magnetic field is much lower.

so the Star current is lower than the delta current
on startup this difference can cause a problem for the circuitry.

you can do a calculation depending on Ohms law

I= U / R

take a look on the circuitry and see which Voltage you have in which configuration and calculate the current with given R

Answer 2

Hey(: . Open the motor junction box where power is fed. If you see three wires joined together, it is STAR. If you see two wires joined in a total of 3 pairs, it is a Delta. Do not count the power lines. -Etri<3