“Excite Shorted!”
The measured load cell excitation voltage has been below 1V for
more than one second. To prevent any damage to the indicator or load cell,
the excitation supply has been disabled. Double check the load cell cable and
connections to the interface board, especially at the terminals marked “EX+” and
“EX-”. The indicator must be turned off and back on again to clear this message.
“ADC Full Scale”
The analog to digital converter reading the load cell went to full
scale positive or negative for more than a second. This is usually caused by faulty
wiring, or in severe cases, a seriously damaged load cell. Check connections,
especially on the terminals marked “S1+” and “S1-”. This warning will clear
automatically when the load cell readings come back into the normal range.
“IR locked.”
Access to the setup and label setup menus is locked out. The “IR lock”
setting in the paremeter menu is turned on and it’s been more than one minute
since the Palm was used to pull settings or totals. To unlock, use a Palm to pull
totals or settings. You will then have 60 seconds to access the setup and label
setup menus. If you do not wish to lock out the setup menus, turn off “IR lock”.
10.2 Calibration Warnings
The following warning messages may appear when entering the calibration routine.
“Check load cell”
This warning will only appear when entering the calibration rou-
tine. It indicates that the load cell reading is past full scale positive or negative.
Calibration will not be allowed in this case. Refer to “ADC Full Scale” warning
for troubleshooting information.
“Check excite”
The load cell excitation supply was measured at less than 4.0 volts.
Check the load cell and wiring, especially the terminals marked “EX+” and “EX-”.
This warning can also be caused by excessive load cell current drain, such as from
more than four load cells tied together, or a load cell with damaged strain gauges.
“Check ex- wire”
Both load cell signal outputs were measured at more than 4.0 volts.
This usually indicates that there’s a poor connection at the “EX-” terminal, or that
the load cell excitation wiring has gone open (such as from physical damage to
the cable).
“Check ex+ wire”
Both load cell signal outputs were measured at less than 1.0 volts.
This usually indicates that there’s a poor connection at the “EX+” terminal, or
that the load cell excitation wiring has gone open (such as from physical damage
to the cable).
“Check signals”
The difference between the two load cell signal outputs was measured
at more than 0.2 volts. This much imbalance between the two signals is usually
caused by either incorrect wiring (such as swapping an excitation and signal wire),
or by a severely bent load cell. Check connections, try swapping pairs, or replace
the load cell.
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