Troubleshooting; Mechanical Troubleshooting; Zero Drift, Non-Repeatability, Or Non-Linearity - Siemens SITRANS WW300 Operating Instructions Manual

Troubleshooting

9.1

Mechanical troubleshooting

Review mechanical installation procedures and perform a thorough visual inspection to be sure
the operating error is caused by a mechanical problem. Then review and check the common
problems listed below.
Note
If you have difficulty determining the cause of the problem, contact your Siemens
representative. Be sure to have the Model Number and Serial Number of your system and all
of the calibration and setup parameters available before calling.
9.2

Zero Drift, non-repeatability, or non-linearity

Check for the following conditions:
● weigh idler alignment
Verify weigh idler alignment is as accurate as possible. Improper alignment is the most
common mechanical problem affecting scale accuracy. Contact your Siemens representative
if you find a problem here.
Note
Alignment should be +1/32" (+0.8 mm) to 0" (0 mm) aligned with approach and retreat
idlers.
● material buildup on weigh section or pulleys, or between the weigh deck and weighfeeder
frame
● belt mis-tracking
● belt too tight
● load cell bolts loose
● speed sensor, pulley, or idler slippage
● load cell shipping bolt (tagged) never removed
● head or tail pulley too high or low, relative to idler alignment. The head and tail pulleys should
be at least 1/8" lower than the approach and retreat idlers
SITRANS WW300
Operating Instructions, 05/2015, A5E33560691-AB
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