Crosshead Eccentric Cage Eccentric LiquidEndMountingSurface
Main Gear Optional Duplex ConfigurationMotor Mount Driver ShaftGear Assembly
Centrac's variable speed drivefeatures:• 100:1 turndown ratio
•+ 0.1% steady state speedcontrol• smart commutation - permitsaccurate feedback signal• no industrial brushes (low maintenance)
• constant torque at low speeds - permits efficient driver sizing lic fluid volume remains constant.
When the hydraulic balance is dis-
turbed, as in variable stroke length designs, the full result of dosage changes can take minutes or hours.Centrac's instant response provides smoother operation in closed loop or automated systems. It also assures proper dosage at all time in systems requiring very close dosage tolerance. Centrac's features include:• 100:1 turndown ratio
•+ 0.5% steady state accuracy• Instant response to dosagechanges• Simple but robust design forreliability• Precise feedback signal
• Efficient drive sizing
• Mates with advanced HPD liquidend for maximum performance• Capacity range between 0.45GPH minimum and 1100 GPH
maximum• Discharge pressures up to1575 psi• Economical duplex configuration availability• Compact design higher capacityin a small footprint
Accuracy 100:1 Turndown Ratio
Centrac's+ 0.5% steady state accuracy over its full turndown ratio is a result of the constant stroke length, and the precise speed control of Centrac's drive. This level of accuracy provides maximum chemical economy while assuring stable automatic operation and opti-
mum process quality. The flexibility of a 100:1 turn-down ratio permits Centrac to be applied where a wide range of dosage rates are required. It also provides built-in growth potential by pumping efficiently in systems requiring a fraction of the pump's capacity for the short term dur-
ing start-up or early phases of an expanding project. Centrac provides all this without compromising accu-
racy or drive power.
Connection Diagram
Drive MotorMotor ControlOptional Remote Operator Control
AC Input PowerRemote Speed (Flow Rate)Control SignalSpeed(Flow Rate)Output
Signal
Response
Centrac responds instantly to changes in dosage rate. Its con-
stant stroke length does not upset the balance within the liquid end hydraulic system, that is, hydrau- 13