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The F3R is a variable frequency drive control panel manufactured by Motor Drives International. 3R stands for NEMA 3R. This VFD panel is very popular in outdoor applications, such as agriculture, rock crushing, mines, refinery, and more. It is designed for locations that are dusty, sites that may cause it to be hit by small rocks or splashed by water (to an extent). The F3R is a great option to house your VFD and its accessories such as line reactors and bypasses in those environments.
Stock F3R control panels are available in 6 different sizes, housing VFDs ranging from 5HP to 800HP (for higher horse powers, check out MDI's Custom Panels /custom-vfd-panels). Each F3R is equipped with rain hoods, washable poly filters, outdoor-rated panel controls; and is forced air ventilated. Some other features of the F3Rs include an advance numeric keypad, remote I/O capability, and a pad-lockable door handle connected to a circuit breaker disconnect. Optional add-ons include 3% or 5% line reactors, 12% or 15% harmonic filter system, three contactor bypass, and many more.
3 of the 6 available sizes (Left: 36"x48", middle: 36"x72", right: 36"x90")
The inside view of the biggest F3R enclosure
NEMA 4X rated panel control cover
Washable poly filters - change them without opening the panel door or cutting power
Pad-lockable door handle
Redundant fans installed to ensure the cooling of the enclosure in case of fan failures
Capacitors - part of the harmonic filter (Silver cylinders); DC link choke (orange)
The other part of the harmonic filter
Circuit breaker disconnect - connected to the door handle to prevent door from opening without shutting off power
The inside view of a different F3R - equipped with a VFD, harmonic filter, control transformer, 24V DC power supply, and a lighting arrester
A closer view of the components - control transformer, 24V DC power supply, harmonic filter
A closer view of the lighting arrester
A closer look of the 24V DC power supply
A dead front F3R - with two doors (all panel controls are located on the inner door)
|NEMA 1||NEMA 1||NEMA 3R|
|Slim 12" wide gray enclosure||Gray enclosure, size varies on horsepower||White outdoor rated enclosures|
|Up to 40 HP||Up to 800 HP||Up to 800 HP|
|Natural air ventilation||Filtered forced air ventilation||Filtered forced air ventilation|
|No filters||Pleated air filters||Washable poly filters|
|Line reactors available||Line reactors & harmonic filters available||Line reactors & harmonic filters available|
|Standard dial keypad||Advanced full numeric keypad||Advanced full numeric keypad|