3 608 870 A47 Tightening Technology | Bosch Rexroth AG 199/263
Nexo cordless Wi-Fi nutrunner | 3 608 870 A47/2017-05
Parameter
Start-up test
At the beginning of a tightening job, the start-up test recognizes whether a bolt has already been tight-
ened. In this process, the nutrunner rotates with the set parameters from the activated start-up test. If the
start-up test recognizes that a bolt has already been tightened, the tightening process will be ended with
an NOK result.
First target function
Monitoring functions (switching)
Table 9–39: Start step dialog – parameter panel
Element Description
Play at start switch Is used to select the torque threshold for playing at the start switch in percent
of the nominal torque. At and above this threshold value, evaluations (OK/
NOK) and results output are implemented for a tightening job. The evaluation
and results output are suppressed if the maximum occurring torque is below
the set threshold.
Default setting: 5 %
Values between 0 and 100% can be set.
Torque correction This correction factor serves to synchronize the Nexo cordless Wi-Fi nutrun-
ner with an external reference system.
Value range: 0.8 - 1.2
Table 9–40: Start step dialog – start-up test panel
Element Description
Active Tick the checkbox to activate the start-up test.
The start-up test reduces the possibility of bolt heads and output drives being
torn off if an already tightened bolt is re-tightened.
Speed Is used to select the value for the speed (in % of the nominal speed of the
configured nutrunner) at which the start-up test is to be conducted.
Default setting: 5 %
Start-up suppression Selection of the time span during which - after start of the tightening step -
the tightening process is not evaluated. The start-up suppression refers to
the start of the torque evaluation. The measurement of the angle values starts
independently of the set value. The start-up suppression will only become ac-
tive if the speed has changed compared to the previous step.
This function is used to ignore torque peaks when accelerating heavy mass-
es. Torque peaks may be caused by, e.g., tools on the hand-held nutrunner
with high moments of inertia.
Default setting: 30 ms
Table 9–41: Start step dialog – target function panel
Element Description
Angle Is used to select the angle for the target function.
Table 9–42: Start step dialog – monitoring function panel
Element Description
Max. torque Is used to select the value for the start-up test (in % of the nominal torque of
the configured nutrunner; default setting is 5%). If this value is exceeded, the
tightening process is immediately interrupted with an NOK result.
Max. time Is used to select the time for the start-up test. If this value is exceeded, the
tightening process is immediately interrupted with an NOK result.
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