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Troubleshooting for Load Cells
Product Support: www.instron.com
3. Remove the fuse holder (1) from the power input connector and remove the fuses.
4. Install new fuses in the holder. Spare fuses are supplied with the system (refer to
“Ancillary parts” on page 120).
5. Re-install the fuse holder into the connector.
6. Reconnect the power cable to mains power and turn on the system. Verify that the
white LED above the
DISABLED indicator on the indicator panel illuminates.
Troubleshooting for Load Cells
Instron
®
load cells, in general, are electrically calibrated, self-identifying and
rationalized. Approximate resistances are given that can verify a possible broken gauge,
or a faulty connector or cable.
If a strain gauge in a cell has been badly overstressed, but still maintains its electrical
continuity, the cell may show a higher than normal amount of creep. If a gauge has
become improperly bonded due to degradation in use, the cell may exhibit a
combination of general instability in its balance point, together with a large amount of
creep. Difficulties of this sort rarely appear as an instability in the calibration of the cell.
If a load cell has been overloaded, the load-sensitive member may be permanently
deformed to the extent that the proper dimensional alignments inside the cell are no
longer maintained. For example, if the position of the central spindle is changed, this
can result in the balance point shifting abruptly as the cell is loaded or unloaded.
To check the load cell, substitute another cell to re-check the test results carefully. If
your results differ significantly from the original test results, then the original load cell
may be damaged. However, many of the symptoms described above can also arise from
a faulty load sensor conditioner, or possibly a mechanical adjustment.
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