Kistler-Morse KM LD3xi Load Cell - Manual (Page 32)

Appendix C. Troubleshooting
C-2
Small Amplitude
Changes or Erratic
Fluctuations in display
readings Fluctuations can be caused
by moisture in cable conduit,
junction boxes, or PCBs. Check conduit, junction boxes, and PCBs for
water contamination. Find water entry source
and correct problem. Dry with a hair drier.
Remove/replace corroded parts and materials.
CAUTION
If using sealant to eliminate water entry, use
Sikaflex ™ 1A polyurethane sealant or Dow
Corning™ RTV 739 or RTV 738. Other
sealants may contain acetic acid, which is
harmful to electronics.
Fluctuations can be caused
by damaged Load Disc. Using Digital Multimeter (DMM), check
resistance for individual Load Discs:
1.
Measure between the disconnected
excitation wires and verify the resis-
tance 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.
Problem Problem Details Solution