Sewha SI 550 - Error and Treatment; Load Cell and Indicator Errors

SI 550 WEIGHING INDICATOR
60
7. Error & Treatment
7-1. Load Cell Installation
7-2. ERROR code
Display
Cause

When Max capacity/digit value is over 20,000

Standard weight value is over than Max Capacity

Standard weight value is less than 10% of Max Capacity

Amp. Gain is too big

Amp. Gain is too small

Weigh is unstable during calibration.

When set out of function value

Tare range error

Empty range error
※※ Err-006 and Err-007 are displayed under situation when it is hard to calculate span value by
the load.
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
When current weight
becomes over Max
capacity, because using
double tare a lot