Glossary - Desoutter CVIC II Bedienungsanleitung

CVIC II

12 - gLOSSARy

Acceleration rate
Angle reset
Angle threshold
Autotest cycle
AZC
Bandwidth
Cycle
Ergo–stop
External stop
gear ratio coefficient
Nominal load
Nominal load coefficient
Phase
04/2010
Original instructions
This is the time expressed in seconds for the tool to switch from the initial speed (the
speed during the previous phase) to the speed requested in the next phase. The
acceleration rate characterizes the acceleration or deceleration of the tool.
This is the action for resetting the angle value. It is usually performed at the beginning
of the cycle for the whole cycle but it can also be performed at the beginning of any
phase of the cycle. In the latter case, the final torque report takes the events into
account from the latestResetting action.
This is the torque value from which the angle measurement is started in a phase
which takes the screw angle as a basis. It is usually set to 50% of the final torque for a
"Torque+Angle" tightening strategy. It is set as low as possible from the linear zone of
the joint for an "Angle+ Torque" strategy.
It is possible to run an autotest cycle to regularly check the correct operation of the
tool at free speed. This autotest cycle can be any cycle among the tightening cycles;
only its programming is specific to check that the tool runs at a given angle and that
the torque transducer provides correct indications. This function is recommended for
automatic stations.
This is an Automatic Zero Control. This task consists in measuring the residual signal
of the transducer (offset) when the latter is stress-free, to store it then to subtract it
from the measurement. This allows you to display a torque equal to zero when no
torque is applied.
The bandwidth of a system is expressed in Hertz. This is the ability of a system
to react more or less rapidly or to eliminate (filter) more or less interferences. For
most tightening applications, a 128 Hz bandwidth is defined which allows finding a
compromise between speed and filtering. When the bandwidth is reduced, the system
filters to a higher extent (eliminates more interferences) but it is slower, which may
result in a difference between the torque applied and the torque measured by the
system.
A cycle is a tightening program which consists of several concatenated phases, each
phase being adapted to the various stages of the tightening cycle. Depending on the
systems, it is possible to pre-program and select one or several tightening cycles. This
allows the same tool to perform tightening with various adjustments.
When this functionality is enabled, the jerk felt by the operator at the end of the
tightening operation is attenuated.
Generally speaking, the tool is stopped when the magnitude being monitored (torque,
angle, torque rate) has been reached. It is an internal stop. It is possible to cause the
tool to stop through an external event generated by a PLC for example. In this case,
the "external stop" function must be enabled and the "external stop" input must be
connected to the source of the event. The internal stops are no longer active.
This coefficient is used when a mechanical subassembly is added to a standard
tool and when it modifies the overall mechanical gear ratio of the tool. This is the
case when an additional gear ratio stage is positioned on the tool output shaft. The
angle value displayed is the angle value measured when the tool is of standard type,
multiplied by this coefficient.
The "nominal load" is the value of the torque for which the transducer generates the
"sensitivity" signal. This data is stored in the tool. The unit reads the nominal load
each timeit is switched on and each time there is a tool change in order to constantly
compute the correct torque value. This data can be displayed but cannot be modified.
This coefficient is used when a mechanical subassembly is added to a standard tool
and when it modifies the output torque of the tool. This is the case when an additional
gear ratio stage is positioned after the torque transducer. The torque value displayed is
the torque value measured by the tool transducer, multiplied by this coefficient.
A phase corresponds to a basic program step of the cycle. The program runs the
phases one after another, from the first one to the last one. As an example: a typical
cycle includes a runDown speed phase (D) then a final speed phase (F), each
containing the data required for their execution. The maximum number of phases
varies according to the systems.
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