9.4
Temperature monitoring (Index 4352-4355)
The temperature is measured via the back of the sensor housing. The better the
thermal diffusivity of the connected material, the more accurate the measurement.
If the sensor is non-flush or there is an adapter plate between the sensor and the
machine, the temperature line is longer and thus the measured value is delayed.
Observe
here.
The Multi Physics Box monitors the contact temperature in the application. It outputs
the currently measured temperature as well as the minimum and maximum tempera‐
ture of all time and since the last reset. The temperature data can be read out via Index
4252.
The temperature values of the sensor can be actively monitored using alarm limits. The
minimum and maximum limit values can be set via Index 4354. If the temperature
changes beyond the set limits, corresponding alarm bits are output:
Table 14: Index 4355 Alarm bits for temperature monitoring
Subindex
Name
1
Contact temperature: max. limit value exceeded
2
Contact temperature: min. limit value undershot
9.5
Shock detection (Index 4434-4448)
The Multi Physics Box monitors the maximum acceleration of the three axes X, Y and Z
in a measuring range of ± 200 g. For active monitoring of shock events, a threshold can
be defined from which a shock is recognized as such. The direction of the axes is shown
on the sensor with a coordinate system. Accelerations against the direction arrow are
negative and with the direction of the arrow positive.
Monitoring of the maximum acceleration is event-driven. Data is only recorded if the
acceleration has exceeded an adjustable threshold (i.e. a shock has occurred). For a
good function of the shock detection, it is important to set this threshold sensibly for
the detection of shocks. As a parameterization aid, a special operating mode is availa‐
ble for this purpose which allows the accelerations occurring during normal operation
to be measured. The threshold for detecting shocks should then be set a bit above the
accelerations measured in normal operation.
Parameterization help (Index 4434)
As a parameterization aid, the maximum acceleration that has occurred since the last
readout can be output in each case. This operating mode is activated by setting the
threshold for shock detection in Index 4435 to 0 g. The current maximum acceleration
can then be read out via Index 4434 and the limit value set based on this.
Operation in event-driven mode (Index 4435-4448)
If the accelerations occurring during normal operation are known, a threshold value can
be defined. The sensor then detects events with higher accelerations. The occurrence
of an acceleration above this threshold is considered a shock event.
NOTE
The minimum threshold for a shock event is 10 g. If the set threshold is exceeded,
the maximum accelerations that occurred, the time curve of the acceleration and a
corresponding alarm are output.
For such a shock event, the maximum acceleration, the associated time stamp and the
time curve of the shock event can be output for all three axes.
OPERATION
9
8028041/2022-08-16 | SICK
O P E R A T I N G I N S T R U C T I O N S | MPB10
43
Subject to change without notice
