FEC AFC1200 - Manual (Page 14)

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6.2 Monitoring Functions
The AFC1200 System is user programmable to select and set the monitoring limits for torque,
angle, time and three independent torque rate stages. Torque rate monitoring may be
configured to perform two different methods of calculations dependent upon the
characteristics of the joint.
6.2.1 Torque Monitoring
Torque Monitoring is a continuous process whenever the System is operating. In Torque
Control method, the High and Low Torque limits are set based upon the engineering
specification for that specific fastener. For Angle and Yield Control operations, the High and
Low Torque limits are either set by the engineering specification for that specific fastener, or
by determining the acceptable limits from a study of known good and bad assemblies. The
High Torque limit will stop the fastening process for Angle and Yield Control operations if it is
reached before attaining the desired angle or elongation, respectively.
6.2.2 Angle Monitoring
Angle Monitoring commences upon reaching the preset THRESHOLD 2 TORQUE value, and
continues until completion of the fastening process or until the High angle limit is reach,
whichever occurs first. In Angle Control method, the High and Low Angle limits are set based
upon the engineering specification for that specific fastener. For Torque and Yield Control
operations, the High and Low Angle limits are either set by the engineering specification for
that specific fastener, or by determining the acceptable limits from a study of known good and
bad assemblies. The High Angle limit will stop the fastening process for Torque and Yield
Control operations if it is reached before attaining the desired torque or elongation,
respectively.
TORQUE
HIGH ANGLE
LOWANGLE
ANGLE
1st TORQUE / ANGLE
ACCEPT AREA
FINAL TORQUE
HIGH TORQUE
THRESHOLD 2 TORQUE
LOWTORQUE
FIG. 6-2-2 Torque and Angle Monitoring Functions
Chapter 6: Fastening Instructions User Console Version A3.53
Page 6-14