Cleveland Motion Controls WebPro Motor Powered Unwind Tension Controller MWP – 12662 - 1 REV BA - Manual (Page 22)

AO-70172
21
Revision BA
WebPro Motor Powered Unwind Tension Controller
reel diameter by dividing the line speed signal by the reel speed signal, below 6% of line speed the
diameter is held in memory and the calculator is disabled to prevent spurious operation. To avoid
interaction with the control function the diameter calculator has a time constant of approximately 60
seconds from full reel diameter to core diameter. The diameter reset function has an instantaneous
action.
Troubleshooting
With the exception of the fuses, F1 - 160mA and F2 - 1A, there are no user replaceable or serviceable
parts in the Controller. If a fuse is ruptured the cause should be investigated before replacement.
1. If the POWER LED is lit, the incoming supply and fuses F1 rated at 160mA and F2 rated at 1A are
correct. If the screen is blank or the backlight is not functioning the Controller must be returned to CMC
Inc.
2. Check that the transducers are wired correctly and that the excitation voltage between TB2 (1 and 4),
and between TB3 (2 and 5) is correct for the type of transducers used. Reset link LK1 if required.
3. Check that the Machine Sequencing switching is wired correctly and enabled from the Machine
Parameters screen.
4. Check that the Output Level Limit is not set to zero, 0%.
5. In Speed and Torque modes, it should be possible to maintain the web tension better than +/-5% at all
times. If not, investigate the motors and drives to confirm that they are of a type suitable for tension
control with an adequate, linear torque rating and this torque is constant as it rotates, that all shafts and
rollers are concentric and rotate freely and the web speed is constant.
6. In Speed mode, with the tension OFF, the unwind speed voltage as determined by the diameter
calculator and the line speed only will be output from the Control Out terminal TB4/5. This should
correspond closely to +10V at minimum diameter and maximum speed if the Output Level Limit is 100%.
7. 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%.