Rockwell Automation 9329 Drive Application Software - Manual (Page 7)

FM – Diameter Calculation
Drive Application Software – page 7 of 30
2.3 Terminology
2.3.1 Web
A web is defined as the material that is being transported through the machine. A
web is sometimes referred to as “sheet” or “strip”.
2.3.2 Strip
The strip is defined as the material that is being transported through the machine. A
web is sometimes referred to as “sheet” or “web”. The term “strip tension” is
referencing the tension of the material in the machine.
2.3.3 Drive
The drive is the power device that is transmitting power to the motor. The motor is
connected to a mechanical device that is propelling the material. This manual is
specific to the PowerFlex 700S drive.
2.3.4 Motor Torque
A D.C. Motor has two currents flowing through it. The first current is the flux, also
known as the field current. This is the magnetizing current that allows the motor to
produce torque. The second current is the armature current. This is the actual
torque producing current of the motor.
An A.C. motor has only one current physically flowing through the machine.
However, this current is a combination of both magnetizing and torque producing
current. Motor Torque on an AC motor is the torque producing portion of the total
current flowing through the motor.
2.3.5 Section
A Web Handling Machine is broken up into sections. A section consists of one or
more drives used to propel the material through the line.
An Unwind Section could consist of one drive, one motor, and one spindle
A lead Section could consist of more than one drive and one motor combination.
This could consist of line pacer and then several helper drives. The helper drives
“help” in transporting the strip through the machine.
Typically when more than one drive is in a section, one drive is the leader and the
other drive is the follower. The follower typically follows the leader’s torque
reference.