Back
The back key allows you to go back to the previous step when calibrating or setting up
the draft weights.
Draft
The T30 can visually draft in up to 5 ways. Pressing the draft key takes the T30 into the
draft setup mode. Please refer to the draft setup procedure later in this manual.
Stats
The stats key causes the weighing and drafting statistics to be displayed. Please refer
to the statistics section for a full description.
Up, Down, Back
These keys are used during calibration, statistics viewing and draft setup. Please see
the relevant sections later in this manual.
Autotally
Autotally will only be active if draft values have been set up and drafting is turned on.
When autotally is pressed, the display will show ‘Autotally’ if it’s enabled, or no text if it
has been disabled. See the section on Autotally later in these instructions.
Calibration
The T30 has the capability of being calibrated in the field. The electronics in this
weighing system is very stable, and this calibration procedure should rarely need to be
done. However, if the weights are critical, it is advisable that the scale be calibrated
every year or two. If the load cells have been slightly overstressed, or specific errors
have been displayed as described later, it is also advisable to re-calibrate the system
before returning the scale for repair. It may be that recalibration will solve the problem.
Re-calibration may not fix the problem if the weigh bars or load cells have been grossly
overstressed.
To perform the calibration, a known fixed weight must be at hand. Also, if the indicator
is not connected to standard Thunderbird load cells, the capacity of the total system and
the number of load cells in the system must be known. The capacity should be printed
on the label attached to the weigh bar or load cell. The test weight must be a minimum
of 5% of the capacity of the system, and small enough to be able to balance easily on 1
weigh bar or load cell. The maximum test weight is the total capacity of the system
divided by the number of weigh bars or load cells. For example, a 2 tonne system with
2 load cells would have a maximum test weight of 1 tonne. Similarly, a 500kg system
with 2 bars has a maximum test weight of 250kg.
Each weigh bar or load cell is calibrated independently, and they must be removed from
any structure that they’re supporting before calibration starts.
The calibration procedure may be aborted at any time up until ‘donE’ is displayed by
turn the indicator off. The back key may be used to repeat a procedure at any time.
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