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 you select a VFD for a motor?
The most important consideration when choosing a Variable Frequency Drive (VFD) is to know the type of load that is being applied to the motor because it will determine the size and cost of the VFD. The VFD must have sufficient current capability so that the motor can produce the required torque for the load.
Can any motor be used with a VFD?
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.
Does VFD HP need to match motor HP?
VFD sizing should always be based on motor current and voltage, not hp.
How do I choose a motor drive?
Tips to choose Motor drivers
- Maximum Supply Voltage.
- Maximum Output Current.
- Rated Power Dissipation.
- Load Voltage.
- Packaging Type.
- Number Of Outputs.
When would you use a VFD?
So, energy savings, intelligent motor control and reduction of peak-current drawn are three great reasons to choose a VFD as the controller in every motor-driven system. The most common uses of a VFD are for control of fans, pumps and compressors, and these applications account for 75% of all drives operating globally.
Is it OK to oversize a VFD?
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.
How much can you overspeed a motor with a VFD?
Motors generally have to withstand 10 % overspeed. But it in no way means many motors cannot withstand much higher over speeds.
What is a VFD rated motor?
VFDs vary the speed of the pump to optimize system control, usually by lowering the speed below the baseline frequency. When the motor is operated at lower speeds, the capability of the motor cooling system is reduced because the motor cooling fans produce less airflow.
How much does a VFD cost?
Typical installed costs of VFD systems range from $200 to $500 per horsepower (HP). Suppliers can assist users in selecting a VFD that is properly sized and that includes any necessary filters and reactors.
Which VFD is best?
I know I need a VFD, but which manufacturer is best?
- Lenze AC Tech. These variable frequency drives are popular for their NEMA 4X indoor and outdoor vfd options. …
- Fuji Electric. Known for their high-quality FRENIC series of variable frequency drives. …
- Delta Industrial Automation. …
- GE Industrial Solutions.