Cleveland Motion Controls WebPro Unwind Brake Tension Controller MWP – 12662 - 0 REV BA - Manual (Page 16)

AO-70173
16
Revision BA
WebPro Unwind Brake Tension Controller
Line Tacho or Encoder *
For Unwind Brake mode this input is may be used to improve the system performance while the
machine is accelerating and decelerating. The system will operate quite well without this feature
provided the acceleration or deceleration rate is not excessively fast.
If an encoder is selected enter the maximum number of pulses per second when the machine is
at maximum speed. This allows for the encoder pulses per revolution and the gear ratio used.
Enter the number of pulses per metre or foot if the Length Counter feature is required.
The tacho or encoder must be Enabled in order to function
Winder Tacho or Encoder *
(For motor powered unwind system, consult CMC Inc)
All Machine Parameters and Product Parameters, including the current TENSION SET POINT value are
saved to non-volatile memory. This ensures that when the Controller is switched off or if the power is
removed, the parameters are saved.
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.