FEC AFC1100 - Manual (Page 21)

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7.4 Calibration adjustment.
The calibration value is set according to the tool type (capacity). However, depending on
the application characteristics or on the prevailing torque generated by the spindle assembly,
the value of the current torque and the torque display by the Axis unit may mismatch. In this
case it is possible to adjust the FULL SCALE TORQUE (CAL) value, so the displayed torque
matches the real value registered by an external torque transducer (Master).
The CAL value can be adjusted up to
± 10
% of the FULL SCALE TORQUE value.
Example:
Let's consider the DFT-801M3-S tool.
Nominal CAL value = 8.0 Kg.m.
Range of adjustment: from 7.2 Kg.m to 8.8 Kg.m.
The torque unit must be the same for all terms.
The FULL SCALE TORQUE value is read from Parameter 1 ~8 D-No 10.
Use the following formula on a collection of at least 10 fastenings when a calibration
correction is necessary:
New CAL value = Master transducer mean/ FEC transducer mean x Existing CAL
value
If the new CAL value is out of the adjustable range, the [Err] message will be displayed in
the [ANGL/SPNO] display.
Example.
Tool Full Scale value (EXISTING CAL)is 78.4 Nm.
STD torque is 49.0 Nm.
Master transducer mean for 10 piece run is measuring only 47.5 Nm.
FEC transducer mean for 10 piece run is measuring 49.0 Nm.
The new CAL value is obtained as follows:
(47.5/49.0 x 78.4) = 76.0
The FULL SCALE TORQUE (CAL) value must be corrected to 76.0 Nm.
Chapter 7: System Operations (Rev. 8/98)
Page 7-21