9.2
Zero point adjustment
The zero points of the respective axes are predefined at the factory. For the TMM22,
these are in the orientation where the sensor is mounted flat on a horizontal plane.
Both the x- and y-axes are at 0 degrees in this position. The respective analog outputs
give out 12 mA or 5 V as the output signal. With the TMS22, the zero point of the z-axis
is in position when the sensor is mounted on a vertical plane and the cable points to
the left. The analog output gives out 4 mA or 0 V.
To reset the zero point at any position, pin 5 or the gray sheathed wire (TEACH) must be
contacted to pin 3 or the blue sheathed wire (GND) for at least 1 second. Successful
zeroing is signaled by the green LED flashing twice. The two signals do not necessarily
have to be separated again. However, it should be noted that before resetting to zero,
they are separated for at least 250 ms. Otherwise, no resetting to zero is possible.
In normal operation, TEACH should be permanently set to U
S
. Performing the zeroing
process results in both outputs of the TMM22 giving out 12 mA or 5 V in the current
position, while the output of the TMS22 is set to 4 mA or 0 V. It should be noted that
the sensor must not be moved during the process.
9.3
Signal filtering
TMx22E inclination sensors support an option to make the angle value more insensitive
to external vibration interference. Oscillation/Vibration interference up to 0.1 Hz can be
suppressed with a factory-configurable 8th order low-pass filter. The default setting is
a cut-off frequency of 2 Hz. This achieves an optimal ratio between signal filtering and
response time. On request, the sensor can also be delivered with a different cut-off
frequency.
Step response of 8th order low-pass filter with 2 Hz cut-off frequency
Figure 12: Pulse response of the filter
Amplitude response of 8th order low-pass filter with 2 Hz cut-off frequency
Figure 13: Amplitude characteristic of the filter
9
DESCRIPTION OF OPERATION
16
O P E R A T I N G I N S T R U C T I O N S | TMS/TMM22
8026576/1EF6/2021-12-13 | SICK
Subject to change without notice
