en03c381.fm, 23.04.2009
P1934E/EN 2009-04
37
Programming
3
Sequence 41
Angle Controlled Back-off with Angle Monitoring
This fastening sequence is generally used to loosen a bolt a specified number of degrees. The
resolver integrated into the nutrunner measures the angle during the backoff. The value is pro-
cessed by the control system. When the Turnoff angle is reached the nutrunner is shut off.
Thereafter the final angle is measured during a dwell time and is then processed as the back-off
angle of the bolt together with the evaluation of the backoff in the control system. This value is
displayed on the Run Screen and can be output to a printer or transmitted to other system
components by data communication. In this stage the oscilloscope function is not supported.
The following parameters are programmable from the Standard Application Builder:
• Sequence input value = 41
• Turnoff Angle (deg) = shut-off angle, back-off angle
• Angle High Limit (deg) = maximum angle, high limit for angle reached.
• Angle Low Limit (deg) = minimum angle, low limit for angle reached
• Speed = maximum speed of the nutrunner during the back-off stage.
Parameter name
Range
Typical
Fastening strategy
Sequence 41
Angle Control Reverse
Angle Low Limit [Deg]
0 to 9999
90% of Turnoff Angle
Turnoff Angle [Deg]
Low Limit to 9999
As appropriate
High Angle Limit
Turnoff angle to 9999
110% of Turnoff Torque
Speed Stage [RPM]
0 to Tool Max
80% of Tool Max
The following parameters are programmable from the Standard Application Builder:
• Speed [rpm] = maximum speed of the nutrunner during the backoff stage.
Parameter name
Range
Default
Speed Stage [RPM]
0 to Tool Max
500 or 30% of tool Max value for
tube wrenches
The backoff parameters that are not displayed are set to values as in the table below.
Parameter name
Sequence 41
Start delay time [mS]
0
Start spike time [mS]
0
Max. fastening time [ms]
10000
End delay time [mS]
30
Torque Filter Factor
1
Torque target
---
High Torque Limit
---
Low Angle Limit
0
Angle Target
9999
High Angle Limit
9999
For a tube wrench, the maximum speed for backoff is 30% of the maximum tool speed. It is not
possible to enter a higher value.
paramete.txtE
