Application: Pumps & Fans Control (Buildings)

• 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.

• 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, therefore 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

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 therefore 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 
Drive 
30% of Energy saving at 80% of the nominal flow