FEC AFC1200 - Manual (Page 17)

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6.2.4 Integrated Torque Rate Method
The AFC1200 System is capable of performing three (3) independent torque rate calculations
using two (2) different procedures for calculating the rate value. The second of these
procedures is the Integrated method. The Incremental Torque Rate Method is enabled
whenever a value (3 ~ 199 odd number) is entered for the INCREMENT ANGLE on the SET
PARAMETER (FASTENING) screen. This method continuously calculates the torque rate for
the period specified by the INCREMENT ANGLE. Each one degree, the actual torque rate is
compared with the preset high and low torque rate values. The calculation is performed until
the end of the stage is reached or until a failure occurs, whichever occurs first. Each
Incremental Torque Rate is calculated by dividing the change in torque during the specific
period (INCREMENT ANGLE) by the INCREMENT ANGLE.
Example:
Deg 5 Deg
Nm
= 0.50
2.5 Nm
MAGNIFIED
FASTENING TQ CURVE TQ
THRESHOLD 1 TORQUE
INCREMENT ANGLE
1 DEGREE
FIG. 6-2-4a Integrated Torque Rate Method Incremental Sampling
If no judgment is desired for any or all stages, the high and low limit values should be deleted
from the PARAMETER SET screen by first selecting the item, then depressing the DEL key
on the keyboard. Upon completion of the fastening process, the System will output the highest
and lowest incremental torque rate value measured during each stage. These values will be
output as 1st, 2nd and 3rd RATE HIGH and LOW.
3rd Rate High Maximum 3rd Torque Rate
3rd Rate Low Minimum 3rd Torque Rate
2nd Rate High Maximum 2nd Torque rate
2nd Rate Low Minimum 2nd Torque Rate
1st Rate High Maximum 1st Torque Rate
1st Rate Low Minimum 1st Torque Rate
NAME AS OUTPUT DATA
Chapter 6: Fastening Instructions
Page 6-17