Tightening
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6.6.3 Monitoring Check – Torque Rate
User Interface:
Parameters: Fatal, Monitoring buffer, T Start, T Stop, A Start, A Stop, TRL, TRH, Dev
Function: This function checks the Torque Rate (TR), i.e. the ratio of torque vs. angle.
Measuring is started when the angle A Start has elapsed from that torque reached the
value T Start. This is point (A
1
, T
1
).
Point (A
2
, T
2
) is the point where measuring is stopped, that is, when any of the following
conditions first is met:
- when the torque reaches the value T Stop
- when the angle measured from T Start reaches A Stop
- when the torque reaches final torque, that is, the end of the monitoring buffer.
This point is used only if both T Stop and A Stop are empty.
T Start, T Stop, A Start, and A Stop are all optional. If T Start is left blank, then A Start is
measured from the start of the monitoring buffer. Leaving A Start empty is equal to setting
A Start to zero. Leaving T Stop and/or A Stop empty deactivates the respective check as
stop conditions.
The Torque Rate is calculated as:
TR = (T
2
– T
1
) / (A
2
– A
1
)
where T
1
, T
2
, A
1
, and A
2
are defined as in the diagrams below.
The measured TR is checked to be within the limits TRH and TRL.
This function also checks that the torque does not deviate more than Dev from a straight
line between the points (A
1
, T
1
) and (A
2
, T
2
). The Deviation in sample k, DEV(k), is
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