Cleveland Motion Controls WebPro Unwind Brake Tension Controller MWP – 12662 - 0 REV BA - Manual (Page 15)

AO-70173
15
Revision BA
WebPro Unwind Brake Tension Controller
TB4/11 is an open drain mosfet which may be used with a suitable electrical relay to select the
pads of a multipad brake or when the Controller is in Torque Control to select the motor torque
range. See Digital Output Connections for more details.
Minimum tension
Enter a value, the minimum tension is 3%, the maximum is 20%. The system may not function
correctly and may be unsafe if it is operated at zero tension (the motor may run forwards).
Output level bias
Unwind Brake mode. Enter a value equivalent to that at minimum diameter at the minimum
tension. The procedure for establishing this value is explained in Controller Tuning, below.
Output level limit
If the unwind brake is oversized the control action may be unstable. Enter a value equivalent to
that at maximum reel diameter at maximum tension and at constant machine speed.
The procedure for establishing this value is explained in Controller Tuning, below.
Diameter adjustment
(Unwind Brake mode only)
In Unwind Brake mode, the Controller will self calculate the reel diameter without additional
inputs. This self calculated diameter is used to adjust the PI stability settings in proportion to the
reel diameter for optimum performance. The self-calculation is approximately 20% accurate and
this is usually sufficient for the Unwind Brake mode. The Diameter % bar graph can be set more
accurately by changing the Diameter Adjustment value.
Set point ramp rate
It may cause an unacceptable disturbance and be unsafe if the tension is changed too quickly.
Enter a value which is slightly slower than the PI stability rate so that the system can maintain the
desired tension value as the set point is changed.
Soft stop time
Enter a value of time in seconds such that the Controller remains active after the Machine Start or
Select OFF contact is opened. This will maintain control as the machine slows to rest. The
Controller is de-activated immediately the Tension Off key is pressed.
Display damping time
If the tension is fluctuating enter a value between 0.1 and 3 seconds so that the display is steady.
The Display Damping operates on the analog bar graph and the digital display.
Display precision
(1, 5, 10 ( 0.1, 0.5 and 1 for percent units ))
Enter a value so the display can be read easily and the tension set point easily entered. This item
also sets the resolution of the tension set point value.
Right transducer
(Disabled, Enabled)
Select "Disabled" when a single transducer is used, for example in wire and cable or narrow web
applications. The single transducer must be connected to the "Left" terminals using TB3.