There are fixed speed control and variable frequency control for oilfield decanter centrifuge. For fix speed control panel, the centrifuge speed depends on the pulley and belt. The speed is fixed and cannot be change.
For VFD control panel for decanter centrifuge, the centrifuge max. running speed depending on the pulley and belt. Through the control of VFD panel, centrifuge speed can be adjusted from 0 to the max. speed, to from the set min. to the set. max. speed.    

There are normally 3 VFD control for decanter centrifuge through the VFD panel.
1) The first VFD is VFD control for main motor. Decanter centrifuge speed can be changed via change the frequency of main drive motor. Most centrifuge suppliers, they will choose VFD control for the main motor drive.
2) The second VFD is VFD control for back drive motor. The function of back drive motor is working together to change the centrifuge differential speed. Differential speed is the main factor to affect separation result.
Formula: Differential speed = Bowl input speed – conveyor input speed / the differential ratio.
The differential ratio speed is a fixed speed, when both Bowl input speed and conveyor input speed changeable, customer is more flexible to get more reasonable differential speed.
3) The third VFD is VFD control for centrifuge feeding pump. Many centrifuge suppliers, they do not choose this VFD control. GN Solids Control company VFD centrifuge with VFD control for centrifuge feeding pump and through PLC system to realize automatic smart control of the centrifuge.

GN Solids Control is China leading manufacturer on oilfield decanter centrifuge. Every year, they sell 200~300 sets different model centrifuges to worldwide countries, like U.S.A, Canada, Poland, Cyprus, Australia, New Zealand, India, Indonesia, Malaysia, Singapore, Thailand, Russia, Kazakhstan, Brazil, Algeria, Nigeria, Egypt, Iran, Iraq, UAE, Yemen, etc…

Besides oilfield decanter centrifuges, GN Solids Control offers linear motion shale shaker, mud cleaner for solids control and vertical cuttings dryer for drilling waste management. For more inquires, welcome you visit GN website or send mail to This email address is being protected from spambots. You need JavaScript enabled to view it. '; document.write(''); document.write(addy_text61852); document.write('<\/a>'); //-->\n This email address is being protected from spambots. You need JavaScript enabled to view it. for inquire.