Cleveland Motion Controls WebPro Motor Powered Unwind Tension Controller MWP – 12662 - 1 REV BA - Manual (Page 16)

AO-70172
15
Revision BA
WebPro Motor Powered Unwind Tension Controller
Calibrate Tension
To calibrate the Controller correctly a spring balance or weights to provide the required tension force and
some flat webbing or rope to simulate the web will be required. If the force is insufficient for the maximum
required tension value, the Controller may be calibrated proportionally. The force should be no lower than
25% of the maximum or the accuracy of tension measurement will be reduced.
Switch on and allow to thoroughly warm up.
From the Commissioning Menu; press 2 to show the Calibrate tension screen.
Follow the on screen prompts. Note The Tension must be calibrated before the Speed is calibrated.
The Auto zero will compensate for the sensing roller weight and
for any of the other analog zero offset voltages. Ensure that the
line speed and reel speed signals and the external tension set
point (if used) are at zero.
The Controller will calibrate both transducers simultaneously.
The rope must be in the exact center of the web path so that
each transducer is equally loaded.
After calibrating the tension, return to the Control screen and verify that the display shows zero when no
tension is being measured and that the display shows the correct tension value when the weight or spring
balance force is applied.
On first calibration two or three load applications may be necessary to "seat" the transducers.
Possible error messages:
Calibration has failed. Either the weight or spring balance force was
much too small for accurate calibration, or the transducers are not
operating correctly.
Press the SET UP key to return to the Commissioning menu
Calibration aborted
This is shown if the SET UP key is pressed during the calibration. The Controller will return to the
Commissioning Menu screen.
The controller has not been calibrated or the settings are no longer
valid. Press any key to continue.
Calibration of the Total Tension Analog Output
The Total Tension analog output provides 0 to +10V at 2mA for a remote meter or chart recorder.
Make sure that no tension is being measured, then adjust VR1 until zero volts are measured at TB4/12.
Using a known weight or spring balance apply the maximum tension and adjust VR2 to give +10V.
The output is not damped. These adjustments must be done with the rear cover removed.