Part Number
Issue
Date
Page
6159937790
12
03/2018
101 / 184
101 (184)
03/2018
CASE A
: Normally there is a rapid change of the gradient of the
torque/angle
function when the bolt
starts moving.
CASE B
: Sometimes, due to high static friction built into the joint (for instance, for no lubrication,
conical seat) as soon as the bolt moves the torque decreases, and the real residual torque is lower
than the peak torque necessary to overcome the static friction.
In both the above cases, the Delta Wrench algorithm detects automatically the correct breakaway
point.
Min Torque
and
Max Torque
define the torque limits where the result is considered as OK.
The
Angle threshold
, that must be greater than the
Cycle start
, defines the point from which the Delta
Wrench starts measuring the angle.
The result of this test is available when the test is finished (after the operator release the torque and
the timeout is expired).
Torque result:
-
Residual torque, if the breakaway point is detected.
-
Maximum torque measured, if the breakaway point is not detected, or if the torque goes over the
Change Screw
value.
If during the residual torque check the operator goes over the
Change Screw
value, a message is
shown on the Delta Wrench display to indicate that the screw must be replaced with a new one.
At the end of the test, the Delta Wrench display background is colored as follows:
Blue
Default color used for Pset execution.
Green
The display turns green if the residual torque measured is between the minimum
and maximum torque.
Red
The display turns red if the residual torque is either below the minimum or over
the maximum torque, or if the residual torque point is not detected.
The buzzer is activated as follows:
Buzzer
The beep emitted by the buzzer starts when the torque goes over the mid-point
between the minimum and maximum torque values.
At the end of the tightening operation three more beeps inform the operator
about the end of the operation. If the result is
Not OK
(because the
Torque
is
either over the maximum Torque or under the minimum Torque), the last beep
remains active to indicate the error, and it is reset when either the
OK
or
CL
button is pressed.