LINK Systems System 1100 Tonnage Monitor - Manual (Page 81)

CALIBRATION
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6-9
the CLEAR key must be pushed to obtain further readings.
Vibratory motion in the machine often introduces stroke to
stroke variations of one or two percent in the load cell
tonnage readings. When this happens it is impractical to try
to refine the load on the machine any closer than within one
or two percent of rated tonnage.
17) After loading the machine to the tonnage at which it is to be
calibrated as per step 16 of this calibration procedure, check
that the installed (permanent) System 1100 is set to display
FORWARD tonnage (no minus sign in the tonnage displays). Also
check that installed System 1100 is not in CAL-CHECK mode and
press the EXIT key to end CAL-CHECK if it is.
For a two channel installed System 1100 unit, make single
strokes of the machine and perform gain adjustments for both
channels between strokes until channel 1 and channel 2
tonnages of the installed System 1100 unit are within one or
two percent of one-half (1/2) the sum of the load cell
tonnages indicated by the channels of the "portable" System
1100 unit.
For a four channel installed System 1100 unit, make single
strokes of the machine and perform gain adjustments on the
four channels between strokes until all four channel tonnages
are within one or two percent of one-fourth (1/4) the sum of
the load cell tonnages indicated by the channels of the
"portable" System 1100 unit.
18) Turn the machine motor(s) off and wait for any flywheel
motion, etc. to stop. Leave power on the installed System
1100 Tonnage Monitor. (On mechanical power presses it may be
necessary to turn the press control system to the "Inch" mode
to retain power to the System 1100 with the main drive motor
off). Select the CAL-CHECK option in the Config menu to
display calibration numbers. Press the YES key when prompted
with "ESTOP WILL ACTIVE! BEGIN CAL-CHECK (Y/N)?". The
calibration number of each channel will then appear in each
tonnage display. These are the calibration numbers for the
System 1100 as installed on the machine. It is IMPORTANT to
retain these numbers so that periodic checks for calibration
can be made. It is suggested that a copy of these numbers be
retained inside the System 1100 cabinet and that a second copy