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SI 400 DIGITAL INDICATOR
7. Error & Treatment
7-1. Load Cell Installation
Error
Cause
Treatment
Remarks
Weight Value is
unstable
1) Load cell broken
2) Load cell isolation
resistance error
3) Weighing part touches
other devices or some
weight is on the weighing
part
4) Summing Board Error
1) Measure
input/output resistance
of Load cell.
2) Measure Load cell
isolation resistance
1. Input Resistance of
“EXC+” and “EXC-“ is
about 400Ω ±30
2. Output Resistance
of “SIG+“ and “SIG-”
is about 350Ω ±3.5
3. Isolate Resistance
is more than 100MΩ
Weight Value is
increased regular
rate, but not
return to “Zero”
1) Load cell Error
2) Load cell connection Error
1) Check Load cell
connection
2) Measure Load cell
Resistance
Weight Value is
increased to
under Zero
Load cell Output wire
(SIG+, SIG-) is switched
Make wire correction
“UN PASS”
display
Load cell broken or Indicator
connection Error
Load cell Check
Load cell connection
Check
Power was “ON” when some
weight is on the load cell.
Remove weight on the
Load cell
“OL” or “UL”
display(Over
Load)
1) Load cell broken or
Indicator connection Error
2) Loading over than Max
Capacity
1) Load cell Check
2) Load cell connection
Check
3) Remove over loaded
weight
