Kistler-Morse KM LD3xi Load Cell - Manual (Page 33)

Appendix C. Troubleshooting
C-3
Problem Problem Details Solution
Small Amplitude
Changes or Erratic
Fluctuations in
display readings
Fluctuations can be caused
by problems with signal
processor. Check signal processor excitation voltage
and incoming AC voltage for accuracy and
stability (refer to signal processor manual).
Sudden Change in
Weight Reading or
System Requires
Frequent
Recalibration
One broken Load Disc can
cause indicated weight to
shift up or down by large
amount, up to 100% of full-
scale live load.
Sudden change in weight
reading can be caused by
problems with signal processor. Check signal processor excitation voltage
and incoming AC voltage for accuracy and
stability (refer to signal processor manual).
Using Digital Multimeter (DMM), check
resistance for individual Load Discs:
1.
Measure between the disconnected
excitation wires and verify the resistance
to be 700 ohms +/- 15 ohms, with a stable
reading..
2. Measure between the disconnected
output wires and verify the resistance to
be 700 ohms +/- 15 ohms, with a stable
reading..
3. Place one DMM lead on the LD’s shield
wire and take four measurements to each
of the other wires. The reading should be
greater than 5 giga-ohms.
4. Repeat Steps 1 through 3 for each
suspect Load Disc, until damaged Load
Disc is located.