VFDs can also save energy
Variable frequency drives (VFDs) reduce energy usage, are safer to operate and increase equipment lifespan. They can also be used to help prevent costly power outages and speed up the repair process when they do occur.
VFDs are more expensive to purchase than across the line starters, but their initial cost can be outweighed by the energy savings that they generate throughout extended use. It’s important to consider the pros and cons of using variable frequency drives in your facility before you make a final decision.
Inside a drive, the incoming AC power runs through a rectifier that converts it to DC power. Then the DC power flows into capacitors that smooth out the electrical waveform. Finally, the inverter changes the DC power into an output AC voltage that goes to the motor.
VFDs can also save energy – Benefits of Variable Frequency Drives
When a drive operates, it continually monitors feedback from the motor to keep it within its setpoint. This feedback is sent to the drive via a sensor such as a pressure sensor or flow meter. Then the drive adjusts itself accordingly. This process creates six current “pulses” as each diode in the drive opens and closes.
The VFD can also control the power it sends to the motor based on the information it receives. It can “tune” its output to match a specific motor load by using the information from the sensor or other input signals such as an emergency stop or a PLC program.
VFDs can also save energy by reducing inrush current, and they can improve the start and stop times of AC motors. They can also help control the acceleration and deceleration of AC motors. This can reduce the amplitude of pressure waves that form when water or other fluids change velocity in a pipe system, which helps to minimize noise and vibration.
Another benefit of VFDs is that they can quickly ramp up and down their power demand when a machine starts and shuts down. This power control feature can prevent massive power surges if a factory, for example, activates many motors all at once. These surges could overload the local power system or cause a company to exceed its agreed-upon power allotments from the power company, resulting in large fees.
Some of the more advanced features that VFDs provide include digital diagnostic capabilities that allow for remote monitoring and troubleshooting. They can also help you optimize maintenance schedules and identify problem areas during operation.
Because of their advanced capabilities, VFDs are a great choice for electric hoist and crane applications. Columbus McKinnon offers a range of VFDs, including open loop vector configurations for maximum efficiency. Contact our team of industry experts to learn more about how a VFD can be used in your application. We can also offer expert advice on integrating a VFD with your existing equipment.
