Recent News

Back To News

DE-7200™ VFD™ Big Bowl Centrifuge

Derrick Equipment’s DE-7200 VFD (Variable Frequency Drive) Centrifuge provides a new concept in centrifuge operation and control. Automatic load sensing and feed pump control enable automated performance up to 500gpm. The conveyor is capable of 90 RPM differential speed. The explosion-proof inverter duty drive system has a 150hp bowl drive and 60hp conveyor drive powered by Pulse Width Modulated (PWM) AC drives with Insulated Gate Bipolar Transistor (IGBT) outputs. Motor drives and peripheral devices are controlled by an environmentally hardened PLC. All devices communicate through a high-speed control network. PLC control offers operating flexibility and data storage. Remote monitoring and control of the centrifuge can be from an adjacent control room or offsite. The PLC controls the feed pump through an AC drive and is automatic or manual. Automatic control maximizes centrifuge throughput by employing a Proportional-Integral-Derivative (PID) loop. Feed pump output increases until the operator input torque setpoint is reached on either the bowl or the conveyor drives. As feed slurry properties change, the PID loop dynamically adjusts pump output to maintain the torque setpoint. With automatic startup and shutdown routines, the DE-7200 VFD Centrifuge is designed for safe, consistent, unattended operation.