Section Seven Troubleshooting Tips - DFE WebHandler 3 Instruction Manual

SECTION 7
1. Most problems are caused by incorrect installation or misapplication of the equipment. So it is very
important to be sure these factors are correct before making any changes to potentiometer, parameters, and
switch settings.
If you would like assistance evaluating your installation, please call Technical service at (603) 332-6150
(Fax: (603) 332-3758, E-mail: techsupport@dfe.com ). We offer experienced technicians whose
responsibility it is to make sure you are satisfied with your DFE equipment. They will be pleased to help.
2. The most common source of improper operation of tension equipment is incorrect installation of the tension
transducers or using transducers of the wrong load rating. Refer to your transducer instruction manual and
check the sizing and installation procedures to verify the installation. NOTE: Avoiding pre-loading the
transducers is very important.
3. Verify the electrical connections to the WebHandler3™ controller. Refer to Section 2.5 .
4. Proper calibration of the tension meter is very important to the operation of the controller. Be sure the
calibration is correct. Refer to Section 3. Improper calibration may cause unstable operation.
5. If your controller has a pneumatic output (WebHandler™ Versions P, C), check the following factors:
A. The output pressure should not fall below 5 psi at core diameter. If it does, the controller may be
unstable. This is caused by the compressibility of air which creates a time delay when the controller calls
for a change of output pressure. At low pressures, the delay becomes long.
B. The air connection between the controller and the brake or clutch should be 1/4 inch O.D. tubing, no
more than 25ft. long. Larger or longer tubing creates excessive volume which causes a time delay when
output pressure changes. This can cause instability. If greater distance is unavoidable, the pneumatic
enclosure should be moved closer to the brake or clutch. Use of a volume booster is an alternative. Call
Technical Service at (603) 332-6150 for details.
6. If the above steps are not successful, perform the basic set-up sequence in Appendix C. If you get
unexpected results in any step, call Technical Service at (603) 332-6150 for assistance.
TROUBLESHOOTING TIPS
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