Rockwell Automation 20G PowerFlex 750-Series AC Drives User Manual
Page 21
Rockwell Automation Publication 750-RM002B-EN-P - September 2013
21
Drive Configuration
Chapter 1
This is a plot showing output voltage, output current, and DC Bus voltage. Here
you can see the current following the voltage in a typical PWM output.
This plot enlarges some of the pulses to see the current and its shape.
Notice the tops have an abrupt change to them. Any rounding of the wave form
at the top is due to the type of resistor used. The resistors used for this plot are the
grid type resistors where the resistor element is coiled along its length, adding a
certain amount of inductance. This inductance helps round over the leading edge
of the current.
Single Phase - PWM into Resistor - No Reactor
Voltage
DC Bus
Current
Single Phase - PWM into Resistor - No Reactor
Voltage
Current