Variable-frequency drives, or VFDs, are a means of controlling the speed of an AC motor, typically an AC induction motor. It does so by varying the frequency of the power source. VFDs operate by switching their output devices, which can be transistors, IGBTs, or thyristors, on and off. VFDs can be either constant voltage or constant current. Constant voltage types are the most common type of VFD. It uses pulse width modulation to control both the frequency and the voltage applied to the load. What is a VFD?
Here, we are using an AutomationDirect ( PLC control of a...
This is a short video demonstrating the use of a vacuum fluorescent display (VFD) as an amplifying device. The video shows the effects of varying plate voltages on the amplification produced by the VFD, using a simple crystal radio as the audio source. Schematics and additional details for both the radio and the amplifier can be found on my web site at: www.hpfriedrichs.com Using a VFD as an...
AVFD Engine 12 responding to air port for a mutual aid assist with an Alert 2. Sorry for the beggening, the camera started recording early. AVFD Engine 12...
Engine 12 responding to mutual aid Bridgeport (CO51) for a commercial alarm investigation. AVFD Engine 12...
Using an Automation Direct Using Modbus to...
AVFD Propane Fire Training Class March 16TH 2008 2nd View - AVFD...
Responding to a MVC AVFD MVC Response
Crash Truck Responding To A MVC AVFD Crash 9...
On September 11, 2001, 343 FDNY firefighters, 23 NYPD officers, 37 Port Authority Police, and eight private EMS/EMT paramedics made the ultimate sacrifice answering the call. The Avon Volunteer Fire Department (AVFD) renews the promise Americans made that day when they vowed to never forget, to always remember. AVFD Remembers...
Brought to the residents of Catonsville and Arbutus, the yearly arrival of Santa on his Firetruck sleigh. - created at animoto.com The Annual AVFD...
New firefighter pranked into thinking he can push start a k-12 saw. AVFD rookie push...
We received the initial call as an MVA and when our EMS unit arrived on scene they advised that it was on fire. The victim was out of the car before we got there. AVFD Truck 107...
Annual Firemans Competition Footage AVFD Firemans...
Aledo VFD operates with mutual aid companies from Willow Park and Hudson oaks. Avfd structure...
Responding to a MVC AVFD MVC Response 2
Students in the Avon Volunteer Fire Department's (AVFD) Annual Citizen's Fire Academy participation in a mock automobile extrication drill, the culmination of a 12-week program designed to demonstrate what the work and dedication of an AVFD volunteer entails. AVFD 2008...
Firetruck responding to an Accident Firetruck MVC...
AVFD Blood Drive...
For members of the Avon Volunteer Fire Department (AVFD) and Avon Police Department, saving lives comes with the territory and opportunities to help people arise every day. Luckily, first responders aren't the only people who can save lives -- by donating a pint of blood to the American Red Cross, just about anyone can help. On Friday, April 2, 2010, the Avon Police and Volunteer Fire Departments are hosting a AVFD 2010 "Battle...
How we do it.... Cotton Eyed Joe...
STRUCTURE FIRE 12-25-08 AVFD STRUCTURE FIRE
Responding To a MVC AVFD MVC Response...
Video of our training class on, AVFD Propane Fire...

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