Web Techniques WT-25 Series - Page 4

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 RUNNING ISSUES:
Machine Hits Preset A, Then Stops and Starts Again
 Need to adjust the "decel" pot on the motor control to be in the approximate range of the 10 o'clock position.
Machine Runs Wide-Open
 Is the main speed pot turned all the way up to maximum?
 Could be a bad main speed pot.
 Does the machine have a constant speed control? and is it turned on? and is it set to a high number?
 If the machine runs full speed and you can't control the speed, it is possibly a blown SCR on the motor control, then you would replace
the motor control--they are not repairable--KB does not sell parts for them. Caution Warning, you need to find out what may have
caused the motor control to fail in the first place. If you sell them a new motor control and they install it without repairing the problem
that caused the first one to fail, it could blow the new motor control. Make them know that if they install it, they own it and they are
responsible for testing to determine and repair the initial problem that caused the motor control to fail in the first place.
Machine Slows Down While Running
 Make sure that the machine didn't just hit Preset A, and is now running in idle mode (Can you adjust the speed with the idle speed pot?).
 Drive Belt Slipping, replace worn belt
 Check the Ice Cube relays on the main circuit to make sure they are pushed in all the way. Remove and replace the relays several times
to make sure you are getting a good connection.
 Check for a loose connection on the back of the direction switch on the front panel, or replace the switch altogether.
 Could have a faulty main speed potentiometer; replace it with a new one (best to replace this pot & direction switch at the same time).
 Could be a bad reverser on the motor control, if so replace motor control (See Motor Control Testing).
Machine Won’t Run Full Speed
 Make sure that the machine isn’t just in idle mode. This is where the machine reaches Preset A (slowdown count) and idles until it
reaches Preset B (stop count). See if they can adjust the speed with the idle speed pot, if so, check the presets.
 Bad Main Speed Pot
 Bad Direction Switch.
 Possibly they need to re-program the counter.
 Check to make sure the drive belt isn't worn and is slipping.