Cleveland Motion Controls WebPro Unwind Brake Tension Controller MWP – 12662 - 0 REV BA - Manual (Page 21)

AO-70173
21
Revision BA
WebPro Unwind Brake Tension Controller
revert to the previous valid input. The Controller has been designed to meet UL and CSA requirements.
The Controller is self-certified as compliant with the EC Low Voltage Directive 73/23 and is CE marked.
The Controller is self-certified as compliant with the EC EMC Directive 89/336. However the EMC
performance will depend on the installation and environment and CMC Inc can give no guarantee that the
installation will be free of problems. The Controller must be installed using best EMC practice and in
particular the earth connection must provide a good EMC path to earth.
Additional Information
The CCFL (cold cathode fluorescent light) has a minimum expected life of 20,000 hours.
The non-volatile memory is battery backed. The battery has an expected life of one year without a
recharge. The battery will recharge when the Controller is powered.
During power up the Controller may output a signal which may cause the machine to move if the
controlled drive is powered and enabled.
External tension set point input
This is an analog signal of 0 to +10V DC, for Master - Slave applications. The input resistance is 100K S.
The EXT SET POINT must be enabled in Machine Parameters to use this feature.
Tension set point output
This is an analog signal of 0 to +10V DC at 2mA maximum, for Master - Slave applications.
Diameter calculation
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. Should the unwind reel diameter reduce quicker than
60 seconds consult CMC Inc. 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. Observe if the tension bar graph is fluctuating while in MANUAL mode. If the fluctuation is greater than
+/-5% of maximum tension, investigate the brake to confirm that it is of a type suitable for tension control
with adequate torque rating and this torque is constant as it rotates, that all shafts and rollers are
concentric and rotate freely, the reels are not excessively out of round and the web speed is constant.
6. Can the output to the E/P converter or High Current Driver be adjusted by the Output Level Bias and
Manual feature. If so, check the air supply and E/P or the electrical supply and the High Current Driver.