Web Techniques WT-25 Series - Page 5

Web Techniques WT-25 Series Troubleshooting Guide
SAFETY WARNING: BEFORE PERFORMING ANY REPAIR TO WEB TECHNIQUES EQUIPMENT, YOU MUST TURN OFF
THE POWER AND DISCONNECT THE EQUIPMENT FROM THE POWER SOURCE.
Machine Surges at Slow Speed
 The machine is surging at slow speeds because of the motor control trim pot called IR Comp.
 Use a very small Phillips head screwdriver, then locate and turn the IR Compensation potentiometer counterclockwise to stabilize the
drive (prevent surging). Theoretically, turning the dial position to about a 9 to 10 o’clock setting should cure the surging problem, this is
the typical setting we arrive at when we are testing the motor controls.
Machine Surges with Constant Speed Control On
Constant Speed Control Surges or is Erratic (OTHER THAN RUNNING TOO SLOW) For Constant Speed Controls PRIOR TO MAY, 2013 ONLY
 There is a possibility that this condition is caused by a bad reed switch that drives the constant speed control. On constant speed
control machines prior to May, 2013, the constant speed control is driven by two reed switches 180 degrees apart underneath the
counter drive roll. Now mind you there will also be two other switches that is used for length counting. The constant speed control
switches are the ones two outer ones 180 degrees apart. The length counter switches are the two closest together.
 The symptom is that the constant speed control speeds up and slows down. This can be a slight change or up to mildly drastic. During
this time the constant speed control never really reaches a constant speed and is like "hunting" for the correct target speed.
 The reasoning behind this is that perhaps is a "weak" reed switch that bounces a lot when the magnet comes near and engages it, but it
continues to bounce. Bounce is when the switch goes to engage and it bounces against the contact creating and on-off-on-off situation.
 Diagnostic Tool: Unplug one of the switches and see if the constant speed control smoothes out. If not, re-plug that switch back on and
un-plug the other one. If the second switch smoothes it out, then replace the first one or vice versa as the case may be.
 Recommendation: Replace both Reed Switches; always replace reed switches in pairs.
Machine Won’t Start
 Preset B has been reached, press stop button, reset counter
 Bad Main Speed Pot.
 Ice Cube Relays have wiggled out of their sockets, push them back in.
 Blown Fuses
 Loose connections/Break in the wiring
 Bad Direction Switch
 Jumpers on the main circuit board need checked to make sure they are not losing connection
 Motor Control is bad, perform motor control speed pot test and direction switch test
 Motor brushes have failed, replace brushes or replace motor.