Question: Can two engines run on one VFD?

A variable frequency drive (VFD) can be used to control multiple motors in some applications provided the right design considerations are made and appropriate protection is provided for each motor. … The VFD must be sized properly, and each motor needs protection.

How many motors can you run on one VFD?

It is absolutely fine to run more than 1 motor on single VFD till the KW is matched and the parameters are set correctly. This is the key of any VFD application.

Can all motors be used with a VFD?

The output frequencies of VFDs can match any motorrated frequency. Since the VFD controls the motor speed and frequency, this can allow a motor rated for one power system, 60 hertz (Hz), for example, to be operated effectively and at full rating on a 50-Hz power system.

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.

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Can you use a bigger VFD than the motor?

An oversized VFD can be used for a smaller HP motor. The advantage of this application is that if the motor requirements increase, the VFD may be large enough to still handle the increased load.

What is vector mode in VFD?

Vector control, also called field-oriented control (FOC), is a variable-frequency drive (VFD) control method in which the stator currents of a three-phase AC or brushless DC electric motor are identified as two orthogonal components that can be visualized with a vector.

What is STO on a VFD?

Safe Torque Off, known as STO for short is a safety feature on newer VFDs that turns off power on the VFD output to prevent the motor from producing torque. This is done through the VFD’s hardware to ensure fault tolerance.

Will a VFD work 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.

Will all 3 phase motors work with VFD?

All motors are not suitable for VFD. The rectifier bridge switches (IGBT) on and off very frequently within the VFD. There is one converter which takes the normal supply (AC) and converts it to a DC link voltage and then there is another inverter which transforms the DC link voltage to a suitable AC voltage.

Do you lose HP with a VFD?

When the VFD reduces frequency and motor speed, it also reduces voltage to keep the volts/hertz ratio constant. Torque remains at 100 percent, but HP is reduced in direct proportion to the change in speed.

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How slow can you run a motor on a VFD?

Generally speaking, TEFC motors are not designed to operate at less than a 4:1 speed range, while some manufacturers make a 10:1 or 20:1 range motor. Most often, operating the motor slower than this requires an auxiliary cooling system. This threshold can be higher depending on the torque the motor is providing.

What can cause a VFD to overheat?


A lot of overheating is caused by “buildup” as discussed above. Your VFD may also get overheated when the current supplied exceeds the drive’s rated level or when your setup has loose connections. Excessive heat results in blown capacitors and other essential components of your VFD.

Why do VFDs fail?

Poor Environment. VFDs are built like computers, and computers are extremely susceptible to dust, debris, moisture, and overheating. … Another common cause of VFD failure due to environment is the clogging of cooling vents by airborne particles, especially when combined with moisture or oil.

Does VFD HP need to match motor HP?

For HVAC applications, it is generally straight forward to select a variable frequency drive (VFD) for an AC induction motor. It is simply necessary to match the voltage and horsepower rating on the driven motor1 to the voltage and horsepower rating on the VFD.

Should I oversize my VFD?

If the VFD is grossly oversized it will not auto tune, however. … The constant torque will require a VFD with a higher rating. I recommend erring on the side of more than necessary, since it will cost more to replace the VFD with a larger one than buying the larger VFD to start with.

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Can you undersize a VFD?

Under-sizing or overloading the VFD for the application

Wherever a VFD is undersized for the load that it will regularly experience, that drive (with its overload-protection function) will most likely trigger frequent trips. … This thermal cycling induces the premature demise of critical VFD devices such as IGBTs.