Atlas Copco STwrench User Manual

STwrench User Guide Pset
9836 4134 01 Edition 2.9 117 (326)
Torque result:
- If the yield point is detected and target angle is reached, the result of the test is taken at
the target angle.
- If the operator stops the tightening after the yield point but before reaching the target
angle, the torque result is the maximum value.
- If the torque goes over the Change Screw value, the yield point is no longer detected
and the torque result is the maximum torque.
The STwrench LEDs, buzzer and vibration devices are activated as follows:
Yellow LED
Torque result between the Cycle Start and the Min. Torque value, or Min. Torque
or Max. Torque but the target has not been reached.
Green LED
Target Angle reached after yield point is detected (within torque and angle
limits).
Red LED
Torque result over Max. Torque or angle result over Max. Angle.
First, second, and third row of
yellow LEDs
Yield point is detected (within torque limits).
Buzzer
Activated when torque goes over the Cycle Start value.
Increases its signal when the green LED is activated.
Vibration
Activated together with the green LED, and remains active until the torque
applied to the wrench is released.
6.7.1.6.1 Yield Point detection algorithm
The following algorithm is used to detect the yield point.
The torque/angle trace is sampled at 1 kHz.
The values T
i
and A
i
are calculated as moving averages of 128 torque/angle samples measured by the
STwrench. This means that each time a new value is acquired, new T
i
and A
i
values are calculated:

Atlas Copco STwrench Specifications

General

Brand	Atlas Copco
Model	STwrench
Category	Tools
Language	English