The main ventilation fans are the main consumers of electric power. Capacity control is carried out by guiding devices which modify the section of the air channel. Reduction of air supply into the pit caused insignificant reduction of electric power consumption. Moreover it led to increased mechanical wear of the blades of the guiding devices.

The main technical solution:

Replacing 4 MW and 0.5 MW synchronous motors in the non-adjustable drive with a 4 MW synchronous motor with frequency adjustment.

We applied the following equipment and software:

 Siemens electric motors of NG-MZ:PALAU2010-AA family

 Siemens converters ROBICON PERFECT HARMONI GEN 3e

 Controllers of SIMATIC S7-300 family

 Multifunctional stations SIMATIC ET 200 for data collection

 Operator’s graphic boards

 Software designed with STEP 7 and WINCC FLEXIBLE packs.