Atlas Copco Power Focus 3000 User Manual

Pset
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7.6.14 PVT comp with snug
This tightening strategy is a development of
the existing PVT comp strategy described in
7.8.4. This strategy is useful when the PVT
comp torque level is higher than P113 Final
target.
The PVT compensate value is retrieved using
the Snug gradient method described above
for finding the snug point and then
calculating the torque compensate value
defined by following parameters.
 P183 PVT distance: a point a defined
angle backwards from Snug point
 P184 PVT interval: an angle interval
during which the comp value shall be
calculated
 P185 Compensate value: option 'Peak' or
'Average' torque value within the
interval.
P186 Delay monitoring after cycle start: is a
parameter for filtering out a certain angle in
the beginning of a tightening where
monitoring for a certain 'gradient' is not
interesting. (Useful when the gradient is high
at cycle start etc.).
1. P186 Delay monitoring after cycle start
2. P184 PVT interval
3. P183 PVT distance
4. P113 Final target
5. Final target + PVT compensate value
6. P190 PVT min monitoring limit
7. P191 PVT max monitoring limit
1
4
3
2
5
Average
P110
Cycle
start
Snug point
Peak
7
6
P185 compensate value
After finding the snug point and the PVT comp value, the torque defined by P113 Final target is added to
the PVT comp value for reaching a total torque target. The achieved torque and the PVT comp value are
presented as in existing PVT comp strategy (i.e. dependent on C503).
If any of the torque values measured while searching after Snug point are lower than Snug PVT
monitoring min (P190) or higher than Snug PVT monitoring max (P191) the tightening shall stop when
Snug is found.
The presented final angle in the result is measured from the snug point.

Atlas Copco Power Focus 3000 Specifications

General

Brand	Atlas Copco
Model	Power Focus 3000
Category	Control Systems
Language	English