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

Troubleshooting

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.
Contact your Siemens representative for assistance determining the cause of
Note:
the problem. Be sure to have the Model Number and Serial Number of your system
and all of the calibration and setup parameters available before calling.

Zero Drift, Non-Repeatability, or Non-Linearity

Check for the following conditions:
• weigh idler alignment. Verify weigh idler alignment is accurate (should be ±1/32"
(0.8 mm) aligned with slider bars approach and retreat). Improper alignment is the
most common mechanical problem affecting scale accuracy. Contact your Siemens
representative for further assistance.
• material buildup on weigh section, pulleys, or between the idlers and feeder frame.
• belt mis-tracking.
• tight belt.
• loose load cell bolts.
• speed sensor, pulley, or idler slippage.
• load cell shipping bolt (tagged) never removed.
• head or tail pulley relative to idler alignment. The head and tail pulleys should be at
least 1/8" lower than the approach and retreat idlers.
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