Atlas Copco STwrench User Manual

Pset STwrench User Guide
126 (326) 9836 4134 01 Edition 2.9
- If the torque goes over the Change Screw value, the residual point is no longer detected
and the torque result is the maximum torque.
If the operator goes over the Change Screw value during the test, a message is shown on the wrench
display to indicate that the screw must be replaced with a new one.
The STwrench LEDs, buzzer and vibration devices are activated as follows:
Yellow LED
Torque over Cycle Start value, or click-point not detected
(and torque not exceeding the maximum value).
Green LED
Result OK. The residual point is detected within the torque
limits.
Red LED
Torque over Max. Torque.
First, second, and third row of yellow
LEDs
Residual point is detected.
Buzzer
Activated when the torque goes over the Cycle Start value.
Increase its signal when the residual point is detected.
Vibration
Activated when the residual point is detected, and remains
active for one second.
6.7.2.2.1 Residual point detection algorithm
The following algorithm is used to detect the torque/time residual point:
The gradient
α
t
of the torque/time trace is calculated by linear regression each time a new sample is
acquired, and the average of 10 different values α
t
is calculated:
10
10
1
∑
=
=
t
t
average
α
α
This
α
average
is used to identify the breakaway point.

Atlas Copco STwrench Specifications

General

Brand	Atlas Copco
Model	STwrench
Category	Tools
Language	English