Assembly
04.00 | PGM 29 - 140 | Assembly and Operating Manual | en | 389284
19
Adjusting the
hysteresis
The hysteresis to both switching points will be adjusted
automatically corresponding to the characteristics of the magnetic
field.
The user can set the switching and trigging points of each position
a little bit closer than for the automatic mode. The trigging point is
closer to the switching point. At the same time the susceptibility to
trouble and damage increases. In the mode of the lowest
hysteresis, an error signal (such as jitter or untimely switch off) can
be avoided, if the sensor is protected against all types of
disturbances (i.e. by shielding). Frequent types of disturbances are
change in temperature and electro-magnetic influences.
Within the closest fine-teach mode, SCHUNK cannot guarantee
EMC-compatibility any more.
The hysteresis adjustment is used for the manual adjustment of
the switching points (if necessary).
In case that the hysteresis automatically determined by the sensor
should be too high or too low after “the adjustment of the
switching points”, you may correct the value as follows.
The sensor avoids a too small hysteresis during hysteresis
adjustment.
Sensors MMS 22, MMS-P 22, MMS 22-PI1 and MMS 22-PI2
The smallest detectable difference in stroke is defined in the
following table:
The smallest detectable difference in stroke based on the nominal stroke
For grippers with X mm
nominal stroke per jaw
Min. query range per jaw/
min. queried stroke difference per jaw
X ≤ 5 mm
30% of the nominal stroke per jaw
X > 5 mm to X ≤ 10 mm
20% of the nominal stroke per jaw
X > 10 mm
10% of the nominal stroke per jaw
Example:
Product with 7 mm nominal stroke per jaw
7 mm * 20% = 1.4 mm
