Three major factors should be considered when determining if a motor is compatible with a VFD: the motor winding insulation, motor bearings and pump operating speed range.
Can a VFD be installed on any motor?
Output voltages are available for VFDs to match almost any existing motor voltage. However, very few, if any, VFDs have a direct 13,800-volt output for very high-voltage motors. For these cases, using a step-up transformer on the output of the VFD is often necessary to match the motor voltage.
What motors can be used with VFD?
The AC electric motor used in a VFD system is usually a three-phase induction motor. Some types of single-phase motors or synchronous motors can be advantageous in some situations, but generally three-phase induction motors are preferred as the most economical.
How do you match a VFD to a motor?
Thus, the rule of thumb for sizing the single phase input on a three-phase drive is to use a VFD rated for 2 times the FLA of the motor. For example if your motor is a 10 HP motor with a FLA of 28 amps, then you would need to select a VFD with an amp rating of 56 amps which ends up being around 20 HP.
How do I know if my engine is inverter duty?
Motor insulation systems that are rated for inverter use will be specified on the motor nameplate (or a sticker). These systems should have wire rated for a minimum of 1600 volt spikes, F or H class insulation, and will be processed with 100% sold resin in a vacuum pressure impregnation (VPI) system.
Can you run a VFD on a single phase motor?
In general single phase motors cannot be run with VFDs. However, it is possible to input single phase to a VFD and output variable voltage to a 3-phase induction motor.
Can a VFD damage a motor?
VFDs can wreck motor windings.
VFDs control motors with a simulated sine wave known as pulse width modulation (PWM). The problem is that peak voltages created by the VFD can often get high enough to break through motor insulation and short out motor windings.
Can you install a VFD on any 3 phase motor?
It is not necessary to have 3 phase electrical input in order to operate a 3 phase motor with a VFD. The electronics of the VFD will step up single phase current during the conversion process. … A 3 phase motor simply attaches to the appropriate output connectors on the VFD.
Can you use a VFD on a DC motor?
– Variable speed drives (VSDs): These drives change the speed of a motor by changing the input voltage and can be used with both AC and DC motors. … VFDs control the frequency and voltage of the AC signal.
Can I add a VFD to my pool pump?
As long as you know wiring and power, most pool professionals can easily install the VFD. It’s simply wired in between the electrical power source and the pump motor. One thing to always remember is that VFDs require the use of a three-phase motor.
How do I choose a VFD size?
Sizing of a VFD is based on the rating of the VFD and the motor load. When the VFD is rated in horsepower (or in horsepower and output current), the VFD must be sized to be greater than or equal to the horsepower rating of the motor (or motors).
Can a smaller VFD run a larger motor?
All that said, it is technically possible. When you use a VFD on a motor, lowering the speed also lowers the effective HP proportionally. So how that can apply here is that technically, since your VFD is 60% of the motor size, if you NEVER try to run it at more than 60% speed, not technically a problem.
Can general purpose motor used with VFD?
Use of inverter-duty motors for variable torque loads is overkill as inverter-ready general-purpose motors are well suited for VFD control with variable torque loads.
Are all motors VFD rated?
In most cases, EPAct Motors with 2:1 Constant Torque ratings and 4:1 to10:1 Variable Torque ratings can be run on VFDs. It is important to note, however, that many fractional and 56-frame motors are not rated for use with VFDs.
When should inverter duty motors be specified?
If the application requires a speed range beyond what is noted on the standard duty motor nameplate, an inverter duty motor should be considered. Inverter duty motors can accommodate speed ranges up to 1000:1 or more and are capable of providing full-rated torque at zero speed, as well as operating over its base speed.