Atlas Copco PowerMACS 4000, User Manual

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Tightening
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Diagram :
Tstart Torque Start Astart Start cond.
– Angle at Tstart
Tstop Torque Stop Astop
1
Stop cond.
– Angle at Tstop (torque falling below Tstop unchecked)
AL Angle Low limit Astop
2
Stop cond.
– Angle at Tstop (torque falling below Tstop checked)
AH Angle High limit Aend
1
Stop cond.
– Peak angle
Aend
2
Stop cond.
– Last measured angle
Angle
Tstart
Astart
Aend
2
Aend
1
Tstop
Astop
2
AL
AH
Astop
1
Result var.: "Bolt A",
“Bolt A2nd” (measured on the second monitoring buffer) and "Bolt A Thresh T" (the
programmed value of Tstart )
Alarms: Angle too high (AHM, AHM2), Angle too low (ALM, ALM2) and Threshold torque not
reached for angle monitoring (TTNOTRM). AHM2 and ALM2 are used for the second
monitoring buffer. TTNOTRM is generated if
Tstart is specified but not reached during the
cycle.
Trace : AH and AL are shown in trace as vertical infinite lines. The lines are only shown when
Torque vs. Angle is selected and Monitoring limits are enabled in the trace form (see
View of trace curves).