Rockwell PowerFlex 70 User Manual

Application Notes C-11
The internal PI function of the PowerFlex 70 provides closed loop
process control with proportional and integral control action. The
function is designed for use in applications that require simple control of
a process without external control devices. The PI function allows the
microprocessor of the drive to follow a single process control loop.
The PI function reads a process variable input to the drive and compares
it to a desired setpoint stored in the drive. The algorithm will then adjust
the output of the PI regulator, changing drive output frequency to try and
make the process variable equal the setpoint.
It can operate as trim mode by summing the PI loop output with a master
speed reference.
Or, it can operate as control mode by supplying the entire speed
reference. This method is identified as “exclusive mode”
Process PI for Standard Control
+
Spd Cmd
Process PI
Controller
Linear Ramp
& S-Curve
+
+
+
PI Enabled
Speed Control
Spd Ref
PI Ref
PI Fbk
Slip Adder
Open
Loop
Slip
Comp
Process
PI
Spd Cmd
Process PI
Controller
Linear Ramp
& S-Curve
+
+
PI Enabled
Speed Control
Spd Ref
PI Ref
PI Fbk
Slip Adder
Open
Loop
Slip
Comp
Process
PI

Rockwell PowerFlex 70 Specifications

General

Brand	Rockwell
Model	PowerFlex 70
Category	Controller
Language	English