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Noise spikes after disconnecting load cell cable

PROBLEM

 

Operator gets noise spikes after disconnected the load cell cable and doesn’t go away even after reconnecting the cable (Figure 1).

 

Figure 1 – Noise on Force signal feedback


 

ANSWER

 

If using a TEDS load cell, this noise could be caused by 793 polling for TEDS information in the sensor.  The TEDS communication lines are in the load cell cable so when there is communication activity on them it will couple noise onto the load cell feedback signal.  One of the “triggers” for 793 to poll for TEDS information is Excitation Fail which happens when the load cell is unplugged.

793 will stop polling for TEDS after performing an interlock reset in the 793 Station Manager software.

K
Keary is the author of this solution article.

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