Rockwell Automation 937CU-AISTR-DC1 Strain Gauge Converter Installation Instructions - Manual (Page 22)

Bul. 937
C Strain Gauge Converter Installation Instructions
Zero point
For installations where a signal of 0 mV does not correspond to the measured value 0 in the selected
unit, a zero offset can be stored.
• If the zero offset is known from the data of the installation, please enter the value under Set
displays.
• If you select (after appropriate measures in the installation, e. g. removing all weights) Execute and
then Yes, the current mV measured value is stored as zero point. The gross value, the net value
and the tare are set to 0.
For storing the zero point by means of the triggers, i. e. without using the control panel keys.
Adjust without mechanical load
The easiest calibration method. However, not all links in the measuring chain will be considered
resulting in some inaccuracies.
• A trigger input must be parameterized as zare
• After installation and connection of the Strain Gauge Converter the corresponding input must be
short-circuited with the measuring cell free from loads.
Adjust with mechanical load
This is the more accurate calibration method because the whole measuring chain is included. It does,
however, require a high effort.
Adjust
The adjust is an exact defined excitation of the cell, e. g. by an exactly known weight. The Strain
Gauge Converter requires both the value of the adjust in the selected unit and the
generated input signal in mV:
• First enter the adjust value in the selected unit kg, N, cbm or pcs under Weight. If you have selected
the unit %, the adjust value must be entered in the unit that was selected before the unit was set
to %.
• After excitation of the sensor (applying the weight), select Execute and then Yes. This determines
the adjust value in mV. The tare is set to 0, gross value and net value correspond to the adjust
value in the selected unit.
For determining the adjust value in mV by means of the triggers, i. e. without using the control
panel keys, see Triggers section.
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