FEC AFC1200 - Manual (Page 18)

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For all control operations the High and Low Torque Rate limits are set by determining the
acceptable limits from a study of known good and bad assemblies.
INTEGRATED TORQUE RATE
ANGLE
1st TORQUE / ANGLE
STD.
THRESHOLD 1 TORQUE
CROSSOVER RATE 2
2ND RATE HIGH
TORQUE RATE 1
TORQUE RATE 2
TORQUE RATE 3
1ST RATE
HIGH
1ST RATE LOW
TORQUE
3
3
1
1
2
2
FIG. 6-2-4b Integrated Torque Rate Method
FASTENING END CROSSOVER RATE 2 3RD TORQUE RATE
CROSSOVER RATE 2 1st TORQUE/ANGLE 2ND TORQUE RATE
1st TORQUE/ANGLE THRESHOLD 1 1ST TORQUE RATE
STOP POINT START POINT STAGE
6.2.5 Time
As outlined in the Fastening Control Methods portion of this Chapter, this System is capable
of performing multiple-step fastening operations. The duration of each of these steps is
governed by one of two independent watchdog time settings. If the step fails to attain the
desired effect before the completion of the specified time, a Reject condition will occur.
FINAL TIME FASTENING END 3RD TORQUE/ANGLE 4TH STEP
FINAL TIME 3RD TORQUE/ANGLE 2ND TORQUE/ANGLE 3RD STEP
FINAL TIME 2ND TORQUE/ANGLE 1ST TORQUE/ANGLE 2ND STEP
1ST TIME 1st TORQUE/ANGLE START 1ST STEP
TIME PRESET STOP POINT START POINT STEP
Chapter 6: Fastening Instructions
Page 6-18