What you'll learn
**Reported symptom:** The weighing value moves negative when test weight is applied, while excitation and zero stability are normal.
Lab time: ~14 minutes.
Lesson briefing
Load Cell Signal Pair Reversed
Reported symptom: The weighing value moves negative when test weight is applied, while excitation and zero stability are normal.
The circuit was commissioned from a known-good drawing. Treat every terminal as suspect, but test from source to load instead of guessing. Use voltage mode on an energised control circuit and continuity only after the simulated circuit is isolated.
Your task
Verify the millivolt signal-pair polarity from the load-cell certificate to the transmitter terminals.
Choose the fault category only when the measurements support it.
Hints
Normal excitation confirms the EXC pair is not the problem.
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This lesson uses 6 placed components on the lab canvas. Components are vendor-neutral (no proprietary trademarks); the wiring rules apply to any equivalent industrial part.
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