Industrial Applications

Fuji Electric Industrial Applications


In all areas which are difficult to reach or it takes a lot of time to evacuate people, exhaust fans are installed. As example: car tunnels, parking houses, Metro stations, public buildings etc. The main purpose of the drive is the control of the incoming air and the exhaust air.Depending on the tunnel manufactures, there are different systems and structures.

In normal cases, fans are controlled depending on CO-concentration (petrol driven vehicles) and visibility impairment (diesel powered vehicles). The control pulses are transmitted from separate measuring instruments for CO-concentration and visibility impairment. The drives help to ensure safe driving conditions in the tunnel by running the fans on demand, using information from sensors connected to an automation management system.When data from the sensors indicates that ventilation is needed, the fans at the tunnel openings start and increase speed gradually. If more ventilation is needed, the fans inside the tunnel also start, increasing the air movement through the tunnel.In the event of fire, the system is programmed to run all fans at full speed to evacuate the smoke from the tunnel by the shortest possible route.


  • Fire mode (for smoke extraction)

Useful in case of a fire (evacuation mode). The drive ignores all inverters alarms, which usually causes a   motor/fan stop and continues running until its destruction. Priority is to extract the smoke.

  • Braking capability

In  case  of  fire,  the  system  can  request  to  change  the  air  flow  from  “suffixation”  to “extraction”.  In  many  specs,  the  time  to  perform  this  job  is  specified  like  “the  system must be able to reverse the air flow within 30s”.

  • Temperature

Between -10°C to +40°C or sometimes +50°C without derating on motor speed. There is also a special specification that says“certification for temperature up to +70°C”

  • Output signals requirements of the Inverter

Inverter in alarm

Inverter running

Frequency speed arrival (FAR)

  • Network Type

Mainly IT neutral system

  • Safety feature

Sometimes “STO SIL 2”.

  • Fieldbus

Ethernet IP or Profibus DP.

  • Regulation

PID control

  • Normative & Harmonics

Sometimes customer wants to have a THDi (%) at PCC lower than” 5%”. IEE519-1992 or following the local regulation

  • Installation

IP21 minimum, inverter is installed in a cabinet and then in an electrical room. Also, the distance between inverter and motor can be long : between some meters up to 500m.


Fuji has some different equipment depending on the amount of requirements; mainly all of requirements are fulfilled by FRENIC-HVAC and depending on some requirements like braking capability or even very low THD some other equipment can be added such as RHC(active front end).


  • Powerful  PID  control  built  in  the  inverter  (1  main  PID,  2  gains  set  and  4  auxiliary PID).
  • Automatic  energy  savings  function,  reaching  higher  energy  savings’  rates  at  low speeds.
  • 3   values   of jump   frequency   select able,   for   avoiding   mechanical   resonance frequencies.   Easy   and   fast   tool   integrated   in   inverter’s   keypad   to   set   these frequencies during commissioning.
  • Flying start for pick up the speed of the fan in case of air influence over the fan. Also for running again the fan after non finished cost to stop.
  • For  FRENIC-HVAC, DC  Reactor  and  EMC  filter  built-in  up  to  90kW(C2  supported, 2ndenvironment  supported),  EMC  filter  built-in  110kW  to  710kW  (C3  supported,  2ndenvironment).
  • For FRENIC-HVAC, protective structure IP21 or IP55 can be selected with the model up to 90kW.


Overhead Cranes

Overhead crane is a type of crane commonly found in industry. An overhead crane consists of parallel runways with a traveling bridge. A hoist, the lifting component of the crane, travels along the bridge.
They are commonly used in the refinement of steel and other metals such as copper and aluminum. At every step of the manufacturing process, until it leaves a factory as a finished product, metal is handled by an overhead crane. As other examples, they are also used in industries such as automobile industry to move raw material or paper mills for heavy cast iron paper drying drums maintenance.


Overhead cranes have two independent movements which are called trolley (for horizontal movements) and hoist (for vertical movements). Travel and hoist movement can be performed independently or combined. Especially critical is the hoisting movement, inverter requires a strong overload capability for handling without problem load during acceleration and deceleration.

Application example: Steel sheet factory

In the other hand, a good speed control accuracy and speed response is needed in order to, especially at very low speed, control the load. Most of the cases, in order to get the best precision at positioning, speed loop needs to be closed by means of an encoder. Crane must have different speeds in order to move fast along the factory, or slowly to position the load. Also maximum speed may be limited depending on the hoist load. Because load is moving upwards and downwards, motor is driving the load in up direction and braking the load in down direction. In case of braking condition, inverter which drives the motor must be able to burn the energy in a braking resistor. Also a regenerative unit is available in case that returning energy to the mains is needed


Fuji Electric has a full range of frequency inverter’s suitable for this application. Starting from the basic inverters, specially designed to move theload in vertical movements in open loop, such as FRENIC-Mini and FRENIC-Multi. And ending with the most performance inverters in the market called FRENIC-MEGA and FRENIC-VG, specially designed to move vertical loads in closed loop.
Depending on the requirements of overhead crane, and functions needed, different family of Fuji Electric products can be chosen. Different motor maps can be programmed in same inverter, in other words, an inverter can control up to four motors. In case that a single movement is performed by morethan one motor, Fuji Electric has a specific function called droop control. Droop control is balancing the load by modifying the speed of the motor. By means of this, inverter prevents that a motor is working against the other one.


• Full range from 0,4 kW up to 3 MW three phases 400VAC power supply.
• 200% overload during 3 seconds and 150% during 1 minute.
• Built-in EMC filter up to 630 kW compliant to industry standards.
• Built-in braking circuit up to 160 kW.
• Excellent vector control with speed sensor.
• Powerful dynamic torque vector control for open loop applications.
• For big capacities, stack type topology is available.
• Adaptable speed depending on the load function (load adaptive control).
• Up to four motor maps can be selectable in same inverter. Same inverter can control
up to four motors for different movements.
• Flux forcing function to pre-magnetize the motor.
• Braking control signal.
• Droop control function.
• Regenerative solution also available with an excellent efficiency and power factor.
• Compatible with most common field buses (T-link, SX and E-SX bus, PROFINET-IRT, PROFIBUS-DP, DeviceNet)
• Functional safety card certified according to safety standards.