Configuring the current minor loop, The current minor loop reference, Hapter – Rockwell Automation WebPak 3000 DC Drive Application Workbook Version 1.1 User Manual
Page 29: 1 the current minor loop reference
Configuring the Current Minor Loop
4-1
C
HAPTER
4
Configuring the Current Minor Loop
The current minor loop (
CML
) regulates the amount of current flowing through the
motor armature. The
CML
is a simple control loop composed of a reference and a
feedback. Refer to figure A.9 in Appendix A of the software manual (D2-3444).
The input to the
PI
block, known as
CML
ERROR
(P.398), is the difference between the
reference and feedback. The output of the
PI
block determines the level of current
flowing through the motor armature. When a reference change occurs, the error
becomes non-zero, causing the
PI
block output to change. This results in a higher or
lower level of current flowing through the armature until the feedback again becomes
equal to the reference.
Configuring the
CML
consists of setting up the following:
•
Current minor loop reference
•
Current minor loop regulator
4.1
The Current Minor Loop Reference
Refer to figure A.8 in Appendix A of the software manual (D2-3444) as you configure
the current minor loop reference.
Three signals compose the
CML
speed reference signal
CML
SPEED
REFERENCE
(P.391)
when
J
15
REGULATOR
TYPE
(P.799) is set to
SPEED
/
VOLTAGE
:
•
SPD
LOOP
OUTPUT
(P.299), which is the output of the speed loop
PI
block.
•
INERTIA
COMP
SELECT
(P.221)
•
LOSSES
COMP
SELECT
(P.315)
Use This Chapter for These Applications:
•
Constant Diameter Speed Regulator
•
Variable Diameter Speed Regulator
•
Constant Diameter Current Regulator
•
Variable Diameter Current Regulator
•
Constant Diameter Position Regulator
•
Variable Diameter Position Regulator
•
Constant Diameter Tension Regulator
•
Variable Diameter Tension Regulator
•
Generic