How do you calculate service factor?
How do you calculate service factor?
Calculate or determine your service factor by choosing the service factor that corresponds to your hp and various RPM levels. For example, according to the table, if you have a 1HP motor and you operate it at 3600 RPM continuously, your service factor is 1.25.
How do you calculate 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 NEMA service factor?
NEMA defines service factor as a multiplier, when applied to the rated horsepower, indicates a permissible horsepower loading, which may be carried under the conditions specified for the service factor at rated voltage and frequency.
What is 1.15 service factor?
Motor “service factor” is probably the most misunderstood value on a motor nameplate. To most it seems quite simple; if it is a 1.0 you can run a motor to 100% load, if it is 1.15, then it can be loaded to 115% of its rated load.
What is a 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 SF in gear box?
What is a service factor exactly? It’s the ratio of horsepower your gear reducer can mechanically handle compared to the horsepower required for your application. Put simply, it is how overdesigned the gearbox is when it comes to handling the application load.
What is the service factor?
What is service factor amps?
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 SF in gearbox?
What is service factor of 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.
Does motor Fla include service factor?
Service Factor is defined as a motor’s ability to operate under a short-term load. The higher a motor’s S.F. rating is, the more durable the motor. Full Load Amps, or F.L.A., represents the amount of current the motor is designed to draw at the rated horsepower.
What does service factor mean in NEMA?
NEMA defines service factor as a multiplier, when applied to therated horsepower, indicates a permissible horsepowerloading, which may be carried under the conditions specified forthe service factor at rated voltage and frequency. This service factor can be used for the following:
What is the NEMA service factor for a Drip Proof motor?
The NEMA (National Electrical Manufacturers Association) standard service factor for totally enclosed motors is 1.0. 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. NEMA Service Factor at Synchronous Speed (rpm) for drip proof motors:
What is the service factor of a motor?
The service factor – SF- is a measure of periodically overload capacity at which a motor can operate without damage. The NEMA (National Electrical Manufacturers Association) standard service factor for totally enclosed motors is 1.0.
What is the service factor of a fan cooled motor?
NEMA does add some cautions, however, when discussing the service factor: Most motors have a duty factor of 1.15 for open motors and 1.0 for totally closed motors. Traditionally, totally enclosed fan cooled (TEFC) motors had an SF of 1.0, but most manufacturers now offer TEFC motors with service factors of 1.15, the same as on ODP motors.
