Chapter: Maintenance
5-8 M10-16248-EN
4. Remove the fuse holder from the power input connector.
5. Install a new fuse in the holder. Spare fuses are supplied with the system. The fuse is a
10A, 250V, 5 x 20mm time lag fuse, Instron part number 27-2-233.
6. Re-insert the fuse holder into the power input connector.
7. Verify that the voltage selection is correct (refer to“Set the Input Voltage” on page 4-
2).
8. Re-connect the power cable to the main power source and turn the power switch to the
On (
I) position. Verify that the POWER indicator light 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to the extent that the proper dimensional alignments inside the cell are no longer maintained.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, recorder, or possibly a mechanical adjustment.
If you suspect that a cell may be damaged, contact your local Instron Service office to
arrange returning the load cell for analysis and possible repair.
Ancillary Parts
The following tables list the ancillary parts that are included with the system upon delivery.
These components are either required to complete the installation, or facilitate setting up
load cells and accessories on the load frame. Keep these components in a safe place.
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