Allen-Bradley 333299-A01 Power drive board

      333299-A01 summary：

• Any of the PowerFlex drives, regardless of their motor control technology (Volts/Hz, Sensorless Vector or Vector) can be set up to regulate speed. Speed regulation and torque regulation must be separated to understand drive operation.

• The PowerFlex 70 and PowerFlex 700 with Standard Control can be programmed to regulate speed using the slip compensation feature. Slip compensation reacts to load changes by adjusting the drive output frequency to maintain motor speed. Torque production operates independently. This feature produces speed regulation of about 0.5% of base speed over a specified speed range (40:1 for V/Hz and 80:1 for Sensorless Vector). These two drives do not have the capability to extend the speed range or tighten the speed regulation below 0.5% because they do not have connections for a feedback device.
• The PowerFlex 700 with the Vector Control option can offer better speed regulation by adding speed feedback. Using a speed feedback device (encoder) tightens speed regulation to 0.001% of base speed and extends the speed range to zero speed.