Motor Overload

[whazza22]

Can you use I = P/V to work out the FLA for a three phase motor if it isn't printed? If so, do you divide the power by 3 because its 3 phase?

 

[pmac10]

transpose power=v*a*sq rt 3*pf

 

[sparkymark1]

i have got 0.63ohms written on my motor for the am2 and ive been told i need to work the overload setting out by a formula what do i do, i have to do it tomorrow

 

[jojo devera]

how to recconectwye delta motor with out tag

 

[thepurple1]

D.O.L is 110% of the FLC and star delta is about 60% of the FLA

 

[Guest123]

Nice to know it's not just me that does this.

 

[johnboy6083]

no its not, i was taught the same also. I was taught to measure current with clampmeter, and then set to 110% of that.

 

[davelerave]

no its not, i was taught the same also. I was taught to measure current with clampmeter, and then set to 110% of that.

if you set according to FLA the windings should be protected


but the motor may be oversized and run well under FLA -so a lower setting could be used as long as nuisance is avoided