FEC FUSIONE-HS-2 - Manual (Page 155)

FUSION Operations Manual Chapter 7: System Operations (Rev.2)
Page 7-31
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 external to the tool output
shaft, the value of the applied torque and the torque display by the CONTROLLER unit may
mismatch. In this case it is possible to adjust the FULL SCALE TORQUE (CAL) value, so
the displayed torque matches the installation torque registered by an external torque trans-
ducer (Master).
The CAL value can be adjusted up to
± 10 % of the FULL SCALE TORQUE value.
Example:
Consider the HFT-025M80-A tool .
Nominal CAL value = 3.5 Kg.m.
Range of adjustment: from 2.8 Kg.m to 4.2 Kg.m.
The FULL SCALE TORQUE value is read from Parameter 1 ~16 D-No 10.
Use the following formula on a collection of at least 10 fastenings when a calibration correc-
tion is necessary:
New CAL value = Master transducer mean/ FEC transducer mean x Existing CAL value
Note: The torque unit (Kgm, Nm, FtLb, etc.) must be the same for all terms. Do not mix
torque units in calculation or errors will result.
If the new CAL value is out of the adjustable range, the [Err] message will be displayed.
Example:
Tool Full Scale value (EXISTING CAL) is 35.00 Nm.
STD torque is 25.0 Nm.
Master transducer mean for 10 piece run is measuring only 24.00 Nm.
FEC transducer mean for 10 piece run is measuring 26.0 Nm.
The new CAL value is obtained as follows:
(24.00/26.00 x 35.00) = 32.305
The FULL SCALE TORQUE (CAL) value must be corrected to 32.30 Nm and en-
tered at [WORK} 1~16 [COUNT/D-NO] 10.
NOTE: WORK 1~16 can have different Calibration values entered. This pro-
vides for an improved accuracy rating over an extended torque range.
Notice : An alternative method of checking calibration using a static torque device (wrench or
bench checker) can be done using the Locked Spindle Mode method. The motor can be
electrically locked while the operator manually applies torque with the tool (using the tool as a
torque wrench) and then comparing the readings from the FEC Controller data display vs. the
torque displayed from the master. See 7-2-2 for a description of how to put the spindle into
the Locked Spindle Mode.