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.
How do you calculate the service factor of a motor?
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.
Is a higher service factor better?
A motor operating continuously at any service factor greater than 1 will have a reduced life expectancy compared to operating at rated nameplate horsepower. Insulation life and bearing life are reduced by the service factor load.” … A much better choice for this application, however, would be a 125 hp (93 kW) motor.
What does SF stand for on a motor nameplate?
Service factor — Service factor (SF) is an indication of how much overload a motor can withstand when operating normally within the correct voltage tolerances. For example, the standard SF for open drip-proof (ODP) motors is 1.15.
How much horsepower can a one horsepower motor with a service factor of 1.2 safely produce?
A one horsepower motor with a service factor of 1.2 can safely produce: A) 1.0 HP. On PSC multi-speed indoor blowers the wire that is wired to power regardless of speed is the ________ wire. Potential relays measure the back ________ developed across the ________ winding to operate the relay.
Can service factors be less than 1?
There are plenty of small motors in satisfactory service with a service factor less than 1. However, the manufacturer needs to specify the duty cycle in absolute terms (example only, 10 minutes ON / 10 minutes OFF) because the time to heat the windings to maximum acceptable temperature must be specified.
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 service factor in design?
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.
Is service factor the same as 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.
What is the service factor of a gearbox?
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.
Can you overspeed a VFD?
With the use of Variable Frequency Drives (VFD), motors can be run at higher than 60 Hz, known as an overspeed condition, typically as direct drive fan wall/plenum fans (per NIH DRM 6.2. 4.2, the maximum operating speed is 90 Hz).