How big of a VFD do I need?

How big of a VFD do I need?

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 you put a VFD 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 is advantage of VFD?

VFD Benefits The most significant benefit to using a VFD is energy savings. By matching system capacity to the actual load throughout the entire year, major savings in system motor energy use are achieved. Another benefit of the units is reduced wear and tear on the 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.

How many HP is a 240V VFD motor?

25 hp (18.5 kW) VFD, three phase 240V, 420V, 480V variable frequency drive, IP20, RS485 enabled, brand new direct sale by Chinese manufacturer with wholesale price. 25 hp (18.5 kW) high performance variable frequency drive, three phase 240V, 420V, 480V for selection.

What is the power output of a 240V variable frequency drive?

25 hp (18.5 kW) high performance variable frequency drive, three phase 240V, 420V, 480V for selection. Can keep constant output voltage when power source voltage varies. Tips: What kind of VFD is appropriate for running a high static inertia load?

Why do VFDs have problems with high inertia?

The reason many variable frequency drives (VFD) have issues with high inertia loads has NOTHING to do with the VFD electronics but rather the motor components including all the mechanics. What happens is that the very large mass of the inertia makes the mechanics (shafts) act like springs.

What is the undervoltage of a VFD?

The undervoltage is a problem that we often encounter in using VFD. It is mainly because of the main circuit voltage is too low (220V series below 200V, 380V series below 400V). The main reason: One circuit of rectifier bridge damage or one circuit of SCR does not work correctly, all these can lead to undervoltage.