LINK Systems System 1100 Tonnage Monitor - Manual (Page 76)

CALIBRATION
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6-4
position and turn off power to the machine. Place the load
cell(s) to be used for calibration into position in the
machine. Load cell(s) of similar capacity and dimension are
preferably centered under each drive connection (pitman,
cylinder rod, etc.) to the slide or ram of the machine. Also
place any parallels or similar thickness plates on or under
the load cells necessary to reduce the gap between slide and
bolster (etc.) so that the "stack" of load cells and parallels
can be contacted at the bottom of the machine stroke.
It is recommended that steel plates at least one inch thick
and of at least 2 inches greater lateral dimension than load
cell contact surfaces be placed both under and over the load
cell to help distribute load and avoid load cell impressions
in slide or bolster material. All plates or parallels should
be symmetrically placed relative to the centerline of the load
cells, and plates and parallels used for each load cell stack
should be similar in dimension to those used in other stacks.
On mechanical power presses and other machines with shut
height adjustments, the stack height should be greater than
the minimum shut height, and the machine shut height must be
adjusted so that clearance between the machine slide and the
load cell stack(s) is provided.
Caution! If the load cell(s) stack height is greater than the
machine shut height, as adjusted, cycling the machine may
result in severe damage to the machine and to load cells!
7) Connect the load cell electrical cable(s) to the load cell(s).
Plug connectors are provided for this purpose.
8) A second System 1100 Tonnage Monitor should be used as a
"portable" unit in conjunction with the load cell(s) for the
purpose of calibration. Connect the wire end of the load cell
cable(s) to the channel terminals of the "portable" System
1100 unit. These terminals are accessible through the front
door of the System 1100 enclosure.
Only one load cell per System 1100 channel may be used. A two
channel System 1100 used as a portable unit can provide for
either single or double load cell calibration. A four channel
System 1100 used as a portable unit can be used for
calibrations that employ two, three, or four load cells.