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7.4
Belt tension
The ideal belt tension for any weighfeeder is just enough tension to prevent the belt from slipping
on the drive pulley. The tension minimizes the effect of the belt on weighing accuracy. Often, the
sole cause of an inaccurate weighfeeder is excessive belt tension.
Specific belt tension cannot be given because the weighfeeder could be mounted in various
applications. As a general guideline, the bottom of the belt should droop 1-2 inches over the
length of the weighfeeder. This is only an approximate specification, as your application may
require more or less tension due to varying belt loading and other operating characteristics.
7.5
Belt tracking
Before attempting to track the belt, be sure:
• belt scraper is in place
• belt tension is near guidelines suggested in Belt tension (Page 21).
• weighfeeder is level and true
• installation has not warped or twisted the frame
• head and tail pulley are square to the frame and parallel to each other
• plow is contacting underside of the belt, belt is engaged with guide rollers.
Note
• Do not adjust belt tracking rollers, they have been factory set.
• Belt plow blades are adjustable vertically for proper contact to the belt.
Note
For units with a self steering tracker, the telescopers should not need to be adjusted, and the
belt will track itself.
Turn on the weighfeeder and observe its tracking line on the head and tail pulleys. If the belt is
drifting toward one side of the weighfeeder, then adjust the telescoper on either side of the
machine (see Telescoper adjustment (Page 22)).
SITRANS WW300
Operating Instructions, 05/2015, A5E33560691-AB
Commissioning
7.4 Belt tension
21
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