Atlas Copco PowerMACS 4000, User Manual

Page: 283 / 668

Tightening
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6.5.2.8 Y1 - Run until Yield point, method 1
Step type Id: 7
Parameters: TC (Torque TC), INC (Increment), NOS (No degrees), TDIFF (Torque difference),
DIR (Direction).
Function : Run spindle, in DIR direction, until yield point. Search for yield point starts when the torque
has reached TC. The average of the torque (T
n
) over NOS angle degrees is calculated. This
procedure is repeated after INC angle degrees. The difference in average torque values
(T
n
- T
n-2
) are continuously calculated and the max difference is stored.
The yield point is considered reached when the calculated difference is less than TDIFF %
of the current max difference.
Diagram :
Angle
Torque
TC Torque TC INC Increment
NOS No. degrees TDIFF Difference in average torque
TC
NOS
TDIFF
TDIFF
TDIFF
TDIFF
TDIFF
TDIFF
TDIFF
Step
NOS
NOS
NOS
NOS
NOS
NOS
NOS
NOS
NOS
1: INC
1
1
1
1
1
1
1
1
1
Trace : Torque TC is shown as a horizontal line from step start to step stop in trace when Torque
vs. Time is selected. Control parameters must be enabled in the trace form (see
View of
trace curves).