Cleveland Motion Controls WebPro Motor Powered Unwind Tension Controller MWP – 12662 - 1 REV BA - Manual (Page 19)

AO-70172
18
Revision BA
WebPro Motor Powered Unwind Tension Controller
Controller Tuning - Torque mode
It is essential that all motor drives are correctly set in accordance with the suppliers instructions BEFORE
the Controller is commissioned. The Controller will not compensate for incorrectly set drives.
The line speed signal may be used to reduce any tension error caused by the inertia of a full reel when
the machine accelerates or decelerates.
In Torque mode, with the tension OFF, the unwind torque voltage as determined by the diameter
calculator and the tension set point will be output from the Control Out terminal TB4/5. This should
correspond closely to +10V at maximum diameter and maximum tension if the Output Level Limit is
100%.
Output Level Limit
First set this item to a value equivalent to the reel drive torque input voltage at maximum torque. If the
reel drive torque input at maximum torque is +10V this item should be set to 100%, if the reel torque input
at maximum torque is +5V set this to 50%.
Select high tension and with the tension OFF, run the machine slowly with a reel of maximum diameter
and with the Tension Set Point at maximum. Adjust the Output Level Limit until the measured tension is
also at maximum. This will require stopping the machine and changing menus.
Static Friction
With no material in the machine, start the machine with the line speed set to zero so that the motors are
energised but not rotating, increase the Static Friction value until the unwind motor just starts to rotate
then decrease slightly, the unwind motor will slow to rest. This overcomes any static friction in the unwind
drive.
Dynamic Friction
First set the Maximum Trim value to 5% and the PI to very slow to reduce the effect of the control
function.
Run the machine slowly with a full reel at a tension near maximum. Slowly increase the machine speed to
near maximum and allow the machine speed to settle. If the measured tension at high speed is lower
than that at low speed, increase the Dynamic Friction value to compensate for rotational losses.
PI Stability Settings
There are two methods of setting the PI stability; through the Product Parameter menu with the machine
at rest or through the Adjust PI stability menu with the machine running.
Access the Adjust PI stability menu from the Commissioning menu. Run the machine with the Controller
in Auto at a Tension Set Point of approximately 50%. Use the SCROLL keys to select the parameter to be
changed and adjust the parameter using the numeric keys or the +/- keys. Press the CONFIRM key to
implement and save the change. An asterisk alongside the Product Number indicates that a parameter
has been changed and that the CONFIRM key must be pressed to implement and save the change.
When the best performance is achieved stop the machine, remember to press CONFIRM and then press
SET UP to return to the Commissioning menu.
PRODUCT NUMBER
PI STABILITY
INERTIA TIME CONSTANT
INERTIA COEFFICIENT
MAX TRIM
PROPORTIONAL BAND
INTEGRAL REPEAT
1 *
MEDIUM
800%
8S
2S
0.0%
10%
TENSION S.P.
OUTPUT %
45 N