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York Variable Frequency Drives VFDs | HVAC Control - Variable Frequency Drives or VFDs have added a whole new dimension to energy efficiency and control. These drives, or VFDs, are hooked up to two different York VAV air handlers that have two three-phase motors a piece.
York Variable Frequency Drives VFDs | HVAC Control
Each air handler has a return fan and a supply fan. Two-thirds downstream from the supply fan motor is a static pressure sensor (Pressure Transducer). This is connected back to a DDC controller which will regulate the speed of the fans based on the static pressure setpoint. Variable frequency drives, or VFDs, allow the system to use only the amount of air that is needed for the VAV boxes. If demand for airflow is high the drives, VFD’s, ramp up and deliver more air.
If the demand for airflow is low the drives, VFDs, slow down so less air is delivered. This allows the system to use less energy and maintain comfort levels based on temperature set points.
York Variable Frequency Drives VFDs | HVAC Control
Variable frequency drives (VFD’s) have been around for a long time and were used with some success with older pneumatic systems. With the rise of DDC in the last 10 to 15 years more and more variable frequency drives (VFDs) are being used to modulate airflow and save energy.
Variable frequency drives work by changing the frequency or hertz of the power supplied to the electric motor. This change in frequency causes the electric motor to speed up and slow down depending on the frequency. 60 hertz and the motor is at full speed and generally (depending on drive parameter settings) 15 or 20 hertz is low speed.
York Variable Frequency Drives VFDs | HVAC Control
The motor can run anywhere in between the minimum and maximum hertz ranges and will respond with the appropriate speed for the hertz. Variable speed compressors are the wave of the future and this will save the industry tons of money when they become more popular and cheaper.
York Variable Frequency Drives VFDs | HVAC Control
i would like info on troubleshooting VFD AYK550-UH-023A-4+K465.
I have several of them at my site. i would like to learn more on troubleshooting for this VFD. Any help will be apprciated.
Thank You
contact the supplier or manufacturer for the book. Read that book in its entirety. Hopefully it is written in simple terms although many that I have read requires an advanced degree in comprehension of engineering terms and methods to understand.