FLA: Full Load Ampere. Its the current drawn by the motor when the motor is running at full load FLA = kW / (1.732*V*pf*efficiency*100)
FLA = full load amps <<>> It is a term that is associated with motors. It is the amperage of the motor when it operates at its full rated horsepower under load.
If the nameplate states 20 amps then that is the full load amperage when the motor is running. The start up current on the motor could reach 300% of the FLA depending on the type of motor and the load that is connected to the motor.
LRA (locked rotor amperage) is not considered. Starting current for a motor is usually in the neighbourhood of 300% of the FLA (full load amps). The FLA is taken from the motor's nameplate.
The main breaker is not based on the HP of the motor it is based on the FLA of the motor. Many different motors have different characteristics and all of the different motors have different amperages Once you have the amperage of the motor the breaker is 250% times the FLA of the motor.
FLA is the nameplate amperage rating of the motor when it is running at its designed horsepower and on the motors designed voltage. 746 watts = 1 HP. The FLA of a 1 HP motor at 240 volts would be W = amps x volts, Amps = Watts/Voltage. 746/240 = 3.1 amps full load. Overload the motor and the amps go higher, motor running at no load amps are lower than FLA
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use clamp on amp meter
First go to the motor and look for the FLA (Full Load Amps) rating on the motor nameplate. If the over load block is of the old style that uses bolt in heaters, look on the inside cover of the magnetic contactor cover. There is a list of proper manufacture heater numbers that will correspond to the FLA. If the overload block is of a newer design then all you do is turn the screwdriver slot dial to the number that matches the motor FLA.
There are many types of overload protection these days and all are based on the FLA (full load amps) of the motor.
The start up current should be listed on the motor nameplate as FLA , full load amps.
Each motor has a published manufacturer Lock Rotor Amperage (LRA) rating that is used to obtain this ratio. If a manufacturer otained a reading of 100A while bench testing their motor (equipment) at full load, if the motor FLA (Full Load Anps) is 50 amps, the raito LRA to FLA is 2 to 1 or 200%.