11.8 Info menu
ADC Raw counts display from analog to digital converter
Offset Calibration zero offset, in raw counts
Zero err
Number of times the dump cycle autozero timer expired (missed
autozero chance)
Stbl err
Number of times the hopper weight didn’t stabilize before dumping
App Name of firmware app (bagger 1)
Build Software revision info (Build 52)
Date Date firmware was compiled (03/28/2012)
Time Time of firmware compilation (12:22:02)
Batt Current power supply/battery input voltage, in V
S1+
Load cell #1 positive signal voltage (should be about half of excite
voltage with good load cell)
S1—
Load cell #1 negative signal voltage (should be almost exactly the
same as S1+ voltage)
Excite Load cell excitation voltage (should be about 4.5V)
Deadload
Display platform deadload weight (assumes load cell has no offset)
232 audit Transmit audit trail through RS-232 port (experimental)
IZ autoset Force a new initial zero
IZ Current initial zero setting
Debug msg
On/Off: Turn this parameter on for more extensive messages during
boot and dump cycle
Bootload WeighTech use only
12 Troubleshooting
12.1 Load cells
Go to the “Info menu” and verify that the “Excite” voltage is about 4.5V. A reading of
less than 1V probably indicates a short from excite to ground. Confirm by removing the
load cell connections. If the excite voltage reads normal with the load cell disconnected,
you’ve got a short in the cable or a bad load cell.
Check to see that the signal voltage in the “Info menu” are about half of excite and
equal. If one signal voltage is near zero, or near 4V, you may have a disconnected signal
wire. Check that connection at the interface board. If the signal voltages are not near
zero or 4V, but are more than a 0.5V different, you may have the load cell miswired, or
a bent load cell.
If the indicator constantly shows “OVERLOAD” or “UNDERLOAD”, follow the
instructions above. In addition, go to the “Info menu” and watch the “ADC” reading
(raw counts). It shouldn’t vary more than 100-300 counts with a good load cell and a
stable environment. With no load on the cell, it should be within +/- 10,000 counts of
zero. (Deadload can cause the no load reading to shift.) If the no load reading is really
large (say, greater than one million counts or less than negative one million counts) and
the connections are solid, you probably have a bent load cell.
Unstable or noisy weights? Perform all the steps listed above. A really good test is
19
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