We are open and ready to serve you. Click here for important information related to COVID-19

FF1 – Fans & Pumps VFD Control Panel

Posted by Yin Tang 11/09/2014 0 Comment(s)

MDI FF1 VFD Control Panel


What is a FF1?


The FF1 is a variable frequency drive control panel (also known as VFD in a box, VFD enclosure, or motor control panel) that is manufactured by Motor Drives International. Along with its siblings - SV1 & F3R, each are designed for different environments and applications. The FF1 is very popular for a variety of industrial applications including fans and pumps. It has a NEMA 1 type enclosure, and houses VFDs ranging from 5HP to 800HP (for higher horse powers, MDI manufactures Custom Panels that will meet specific needs).


Some of the features of FF1 include: easily changeable air filter, LED lights showing real-time status of the panel, an advanced numeric keypad, remote I/O capability, operator devices, and pad-lockable through door circuit breaker disconnect handle. Optional add-ons include: 3% or 5% line reactors, 12% or 15% harmonic filter system, 3 contactor bypass, and many more.


Differences between SV1, FF1, F3R


Slim 12" wide gray enclosureGray enclosure, size varies on horsepowerWhite outdoor rated enclosures
Up to 40 HPUp to 800 HPUp to 800 HP
Natural air ventilationFiltered forced air ventilationFiltered forced air ventilation
No filtersPleated air filtersWashable poly filters
Line reactors availableLine reactors & harmonic filters availableLine reactors & harmonic filters available
Standard dial keypadAdvanced full numeric keypadAdvanced full numeric keypad


FF1 Family Photo

The FF1 family (Left: 48"x35", Middle: 36"x24", Right: 60"x36")


VFD Control Panel Inside View

The inside view of the 36"x24" FF1 with a 15% harmonic filter (optional), 3 contactor bypass and a circuit breaker disconnect


VFD Control Panel Inside View

The Inside view of the 60"x36" FF1 with a DC link choke, 3% line reactor, 3 contactor bypass, and a circuit breaker disconnect


VFD Control Panel

Gray: Mitsubishi F700 VFD (standard equipment)
Orange: DC link choke (Comes with Mitsubishi F-series 180+ Amps VFDs)


Circuit Breaker Disconnect

Circuit breaker disconnect - shuts off the power before you open the panel


Control Panel Fans

Redundant fan to ensure the temperature stays cool


Control Panel Air Filter

Air filter located outside of the panel - change it without opening panel door or shutting off power


Advanced Numeric Keypad

Mitsubishi advance numeric keypad that will make programming much quicker


Control Panel Lights

LED lights to show real-time status of the VFD panel


Padlock-able Control Panel

Padlock-able door handle


3 Contactor Bypass

The 3 contactor bypass, and part of the 3% line reactor (orange)


FF1 VFD Control Panel

Left: An inside view of a 208V FF1. You can see the 3 capacitors - the silver cylinders in the middle.
Right: The rear side of the 60"x36" FF1. The VFD comes out in the back for ventilation purpose in all 60" FF1



  • Great for fan and pump applications
  • 3 enclosure sizes available
  • NEMA 1 gray enclosure
  • Filtered forced air ventilation
  • Redundant cooling fans for backup
  • Easily removable pleated air filter placed outside of the enclosure for easy removal and replacement without cutting power or opening the enclosure door
  • All components housed in one single enclosure, no additional wiring or boxes
  • Easy installation
  • 3 lines in & 3 lines out
  • UL508A listed
  • Remote I/O capability
  • Two optional cards can be installed simultaneously
  • Soft PWM for peak voltage mitigation at motor terminals and quiet operation
  • Advanced full numeric keypad installed in the front of the panel - operate & maintain without opening the panel or cutting power
  • 3% (Standard) or 5% (Optional) line reactors are available to limit harmonic distortion to 35% or 27% respectively
  • 12% (Optional) or 15% (Optional) harmonic filter available to limit harmonic distortion to 12% or 15% respectively
  • Three contactor bypass (optional) electrically and mechanically interlocked, allows the motor to run across the line in case of a VFD failure
  • Door-interlocked input circuit breaker disconnect - provides additional safety by powering down the equipment before opening the panel and allowing OHSA lockout
  • Embossed numbering system - each wire is uniquely identified for ease of troubleshooting
  • 22mm door operator switches - power on and off and make adjustments without opening the panel


  • Available from 5 to 75HP (230V) or 5 to 800HP (460V)
  • Frequency: 50 or 60Hz
  • Overload rating: 110% for 60 seconds, 120% for 3 seconds (additional overload ratings optional)
  • Standard equipment: Mitsubishi F700 series VFD (other options available)
  • Standard ambient operating temperature: 40° C
  • 1 year standard warranty (extended warranties optional)


Shop our FF1 VFD panels now:




Also check out the other two MDI panel series:

SV1 (NEMA 1 panel – popular for HVAC application)
F3R (NEMA 3R outdoor panel)

Leave a Comment