Service Factor Amps, or S.F.A., represents the amount of current the motor will draw when running at the full Service Factor. In the example nameplate, the S.F.A. is eight amps at 230 volts. Continually exceeding the S.F.A. shown on the nameplate can shorten motor life.
What is 1.15 service factor?
Motor Service Factor (SF) is the percentage of overloading the motor can handle for short periods when operating normally within the correct voltage tolerances. … This means that a 10-hp motor with a 1.15 SF could provide 11.5 hp when required for short-term use.
What is the service factor rating of a motor?
Motor service factor (SF) is the percentage multiplier that a motor can handle for short periods of time when operating within its normal voltage and frequency tolerance. In other words, it is a fudge factor that give extra horsepower when it’s occasionally needed.
How do you determine amp service factor?
For example, the FLA or full load amps of the motor above is 10.8 amps at 115 volts. The service factor or S.F. is 1.5, making the service factor amps 16.2 (rounded down to 16 on the motor tag) at 115v because 10.8 x 1.5 = 16.2.
What is RLA of motor?
Rated Load Amperage (RLA). As it relates to HVACR, Rated Load Amperage (RLA) is a mathematical calculation used to get Underwriters Laboratories (UL) approval for a certain compressor motor. … It is the actual maximum continuous current value that the compressor’s motor protector will carry without opening.
What is a good service factor?
The service factor – SF – is a measure of periodically overload capacity at which a motor can operate without damage. … A motor operating continuously at a service factor greater than 1 will have a reduced life expectancy compared to operating at at its rated nameplate horsepower.
What is safety factor of motor?
Engineers should choose a safety factor of 1.5 to 2.25 according to most documentation and motor selection guides. The drive should be expected to output enough energy for the amount of Torque that the motor should supply.
How do you calculate motor factor?
Calculate your operating or “effective” HP level. Multiply your motor horsepower by the service factor. For example, if you have a 1HP motor and your service factor is 1.25, then you can operate safely at an HP = 1.25HP without overheating or damaging the motor.
What power factor means?
Power factor (PF) is the ratio of working power, measured in kilowatts (kW), to apparent power, measured in kilovolt amperes (kVA). … The result is expressed as kVA units. PF expresses the ratio of true power used in a circuit to the apparent power delivered to the circuit.
How do you calculate full load amps?
Full load current I = P / (V x Cos pi) Amps
KW = output power in Watts……. All are given at the motor’s nameplate details.
What is the difference between service factor and safety factor?
Service factors are used to account for higher torque conditions of the equipment to which the coupling is connected. … Safety factors are used in the design of a coupling. Coupling designers use safety factors because there are uncertainties in the design.
What is a pump service factor?
Generally, service factor is the measurement used to determine the peak performance at which a pump motor can operate. The National Electrical Manufacturers Association (NEMA) defines service factor simply as a multiplier that indicates the amount of additional load a motor can handle above its nameplate horsepower.
What are RL amps?
The L.R. stands for Locked Rotor Amperage and is what the system draws when. the compressor first starts. Locke Rotor means when the rotor of the. electrical motor running the the compressor is at a stand still and must.
How do I convert amps to watts?
Watts = Amps x Volts
- 10 Amps x 120 Volts = 1200 Watts.
- 5 Amps x 240 Volts = 1200 Watts.
How do I convert LRA to amps?
AMPS = ( Horsepower x 746 ) / Voltage
So this is a 12 horsepower motor based on its LRA or FLA rating.