LINK Systems System 1100 Tonnage Monitor - Manual (Page 80)

CALIBRATION
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6-8
16) If a single load cell is used for calibration, continue to
single stroke the machine and adjust shut height or other
bottom of stroke adjustment until the rated capacity of the
load cell or the machine, whichever is less, is reached on the
CHANNEL of the "portable" unit to which the load cell is
input.
The rated tonnage capacity of the load cell should be at least
50% of the rated tonnage capacity of the machine being
calibrated. Adjustment distance should be restricted to less
than 0.001" between strokes as rated machine tonnage is
approached.
If two or more load cells are used for calibration, adjust the
shut height or other bottom of stroke adjustment until about
20% of rated machine tonnage capacity is displayed on the
"portable" unit TOTAL display. The tonnage exerted on each
load cell is displayed on the channel tonnage displays to
which each is input. If load cell tonnages are not equal, add
shim stock to the stack of load cells with lower readings.
Make a single stroke of the machine and observe the new
tonnage readings of each load cell channel. Repeat this
process until all load cell readings are equal to within 2%.
When load cell tonnages are equalized, again repeat the cycle
of single stroking the machine with shut height or other
bottom of stroke adjustment between strokes and continue to
observe the tonnage on each load cell channel of the
"portable" System 1100. It may be necessary to re-shim
certain load cell stacks to equalize tonnage on all load cells
as rated tonnage capacity of the machine is neared. Rated
machine capacity of the machine is reached when individual
tonnage on load cells equals the rated machine tonnage divided
by the number of load cells used to calibrate the machine.
For example, if four (4) load cells are used to calibrate a
200 ton mechanical power press, the press is loaded to
capacity when each of the four load cells is loaded to 50
tons. When rated machine tonnage, or a lesser tonnage at
which the machine is to be calibrated is reached, lock shut
height adjustments, etc., and proceed to step 17.
Do not exceed rated tonnage capacity of the machine or load
cells during the calibration process by more than five or ten
percent. If the tonnage exerted on any channel of the
"portable" System 1100 unit exceeds the High Setpoint limit,