Kistler-Morse KM LD360s - Manual (Page 28)

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. Set meter resistance scale to accommodate
measured range up to 20,000 ohms.
2. Remove one Load Disc’s wires from
junction box terminal.
3. Put one DMM lead on Load Disc’s white
wire and other lead on brown wire. Record
resistance reading, and verify it is 8,750
± 250 ohms and stable. If reading is outside
this range, Load Disc is damaged and must
be replaced.
4. Put one DMM lead on Load Disc’s white
wire and other lead on black wire. Record
resistance reading, and verify it is 8,750
± 250 ohms and stable. If reading is outside
this range, Load Disc is damaged and must
be replaced.
5. Verify readings from Steps 3 and 4 are
within 400 ohms of each other. If not, Load
Disc is damaged and must be replaced.
6. Repeat Steps 2 through 5 for each suspect
Load Disc, until damaged Load Disc is
located.
Appendix C: Troubleshooting the Load Disc System
C-3