What is the service factor of motor?
Service factor – SF – is a measure of periodically overload capacity at which a motor can operate without damaging. The service factor – SF – is a measure of periodically overload capacity at which a motor can operate without damage.
How do you find the service factor of a motor?
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 is 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.
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 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.
What is the normal power factor?
Power factor is the relationship (phase) of current and voltage in AC electrical distribution systems. Under ideal conditions current and voltage are “in phase” and the power factor is “100%.” If inductive loads (motors) are present, power factor less than 100% (typically 80 to 90% can occur).
Is power factor can be negative?
For an Inductive load the Power Factor is negative. For a Capacitive load, the power factor is positive. NOTE that load here refers to whatever is being monitored for power and energy usage.
What is a lagging power factor?
A lagging power factor means the impedance in the circuit is inductive and causing the phase current to lag the phase voltage. This means our phase current has a negative angle when the phase voltage is at 0º
Why do we use power factor?
A lower power factor causes a higher current flow for a given load. As the line current increases, the voltage drop in the conductor increases, resulting in a lower voltage at the equipment. With an improved power factor, the voltage drop in the conductor is reduced, improving the voltage at the equipment.