Screw Compressors

A machine with an auger shaped shaft used to compress gas.

Fast Facts

Industry:

Other

Customer Type:

User, OEM, Contractor

Degree of Integration:

Easy

Ease of Application:

Simple

Performance Level Required:

Medium

Suggested ABB Solutions:

ACS550
ACS800


Required Drive Features    Motor Control Type    Regulation Type   


Required Drive Features

Dynamic Response

High performance applications often demand nearly instant response to changes in speed or torque commands or input status changes. The higher the dynamic response, the more capable the drive is in meeting these demands.
Requires: A drive that meets the response demands.

PID Loop

An internal function provides closed loop process control with proportional, integral and derivative (PID) control. The PID function reads an analog input to the drive and compares it to a desired setpoint. The PID loop adjusts the drive output frequency (and therefore the process) to make the input value equal the setpoint.
Requires: A drive with one or more internal PID loops to eliminate the need for external hardware.

Slip Compensation

A squirrel-cage motor slips under load. To compensate for this, the frequency can be increased as the motor torque increases.
Requires: A drive that provides adjustable slip compensation.

Speed Range (10:1)

All applications operate over a given speed range, defined as the ratio of maximum continuous speed to minimum continuous speed.
Requires: A drive that can produce the needed torque and speed torque regulation (accuracy) over the required speed range.

Back to Top

Motor Control Type

Volts per Hertz (V/Hz)

Applications that do not require significantly more torque than the original motor rating can most often be addressed by a drive using V/Hz algorithms. Loads, such as centrifugal fans and pumps or simple conveyors, are difficult to overload and therefore do not require the performance of other motor control algorithms. Simply maintaining a fixed ratio between drive output voltage and frequency is sufficient.
Requires: A drive that offers this motor control method when simple speed control with rated torque is required.

Back to Top

Regulation Type

Speed

Applications that depend on accurate speed to accomplish the task require a drive that can control or 'regulate' speed.
Requires: A drive that regulates speed to the needed accuracy. Methods include open loop, slip compensation and encoder feedback.

Back to Top




    •   Cancel
      • Twitter
      • Facebook
      • LinkedIn
      • Weibo
      • Print
      • Email
    •   Cancel

    Your preferences:

    ABB contact for United States of America

    seitp322 c1256eb10046d2a1c12570ae0075189d