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3 608 870 A47
Table 9–44:
Element
Speed
Start-up suppression
Torque threshold
First target function
The target function controls the process sequence of the tightening step by monitoring the target param-
eter (e.g. torque) and ends the step if the parameter has reached its target value. The target parameter is
the measured variable (e.g. torque) of a tightening step, which must reach a specific value (target value)
for a tightening process to be performed successfully. The tightening step is terminated once the target
value has been reached.
Table 9–45:
Element
First target function
(Or) 2. Target function
In addition to the permanently activated 1st target function, it is also possible to select a 2nd target func-
tion. It is not allowed to select identical target functions. If two target functions are activated, the target
function that is the first one to be reached will end the tightening step.
Monitoring function
The monitoring function keeps track that the upper and lower limits are complied with during the tighten-
ing process by checking a monitoring parameter.
If the monitoring function has switching capabilities, the tightening step will be terminated immediately if
a limit is exceeded. If it is has no switching capabilities, the step result changes to NOK, even if the target
parameter has been reached.
The monitoring parameter is the measured variable (e.g. gradient) of a tightening step that must be main-
tained within specific limits, in order for a tightening process to be performed safely. If the limits are vio-
lated, the tightening step may be terminated.
Nexo cordless Wi-Fi nutrunner | 3 608 870 A47/2017-05
Tightening step dialog - target panel
Description
Is used to select the speed (= set speed) to be used for tightening in this
tightening step. A negative speed means counterclockwise rotation, a posi-
tive speed means clockwise rotation.
Is used to select the time for the start-up suppression in ms after the tighten-
ing step has been started during which the tightening process is not moni-
tored.
This start-up suppression is necessary to hide torque peaks that are caused
by the inertia of masses. One possible reason for excessive torque peaks may
be large speed jumps, e.g. acceleration from n = 0 to 500 min-1.
Usually, the preset value of 0 ms does not need to be changed. This time
must be changed, however, if large masses (e. g. special chucks) are at-
tached to the output drive or the tightening step is very short (hard tightening
case). Values between 0 and 100 ms can be set.
Is used to select the torque threshold for starting angular measurement.
Tightening step dialog - first target function panel
Description
Selection of a target function and entry of the appropriate target parameter.
– Torque
The target parameter within a tightening step is the measured torque. This
parameter must reach a specific value (set value) to ensure that the tight-
ening job is completed successfully; this will end the tightening step.
– Angle
The bolt is rotated by a specified angle. Angle counting begins when the
torque threshold is exceeded.
– Time
The tightening step ends once the specified tightening time has been
reached. The Time monitoring function activated by default must be
greater than the tightening time in order for the tightening case to be eval-
uated as OK.
Tightening Technology | Bosch Rexroth AG 201/263
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