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Pumps & Fans Control (Buildings)

Pains & drivers

  • 70% of electrical consumption in Industry is used to turn motors. 33% of them control Pump or Fan Applications.
  • Most of Pump and Fan applications are driven by a DOL solution of SoftStarter. This means that the motor runs at full speed and the flow variation is obtained. The energy consumption falls very little when the flow decreases. At 80% of the nominal flow, the energy consumption remains at 95%. The potential for savings on the installed base is huge.
  • CEMEP association has made a simulation for the European market. The use of Drive in such applications could save 900 M Euro/year and 4 Million tonnes of CO2/year.

How can a customer manage energy more efficiently?

  • To save energy we have to:
    - drive the motor with a frequency inverter instead of a contactor or Soft Start
    - remove the restriction device (valve or damper)
  • The AC Inverter allows to adjust the speed of the Pump or the Fan, therefor the Flow
  • The result is huge saving compared to conventional solutions:
    - up to 50% for Fan, Pay back of the drive within one Year
    - up to 30 % for a Pump , Payback within 2 years

Solutions or architectures used in the application

Solutions or architectures used in the application

A) Solution without drive
The motor turns at fixed speed according to the frequency network and the number of poles.
Example : 3600 Rpm for 60 Hz
Motor 2 poles
The only way to adjust the Flow is a restriction device (damper) generating losses

B) Energy Saving Solution with drive
The Drive (named also frequency inverter) allow to varies the frequency therefor the motor speed.
The Flow is directly proportional to the speed.
Damper or valve are not any more needed

C) Energy Consumption with and without drive
Example for Fan Application

Outlet damper
Variable speed drive
50% of Energy saving at 80% of the nominal flow

Example for Pump Application

Control valve
30% of Energy saving at 80% of the nominal flow

Schneider Electric Solutions
Schneider Electric SolutionsFlexibilityProductivityEnergy cost savingInnovation

Altivar 61


Altivar 61


W@de W320i, Magelis XBT-N, TeSys U, Altistart 48, Multi 9


W@de 320e, Magelis XBT-G, Vijeo Citect, Altivar 61


W@de RTU, Magelis XBT-N, Altivar 61, Multi 9


PowerLogic, Compact NS, Altivar 61


Modicon Premium, Advantys STB, Magelis XBT, Vijeo, Altivar 61, TeSys U


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