Festo Генератор вакуума OVEM, дюймовый - Handbuch (Seite 68)

OVEM
68 Festo ć OVEM ć 1004b English
Hysteresis
1 / 2
3
4
50 mbar (fix)
5
1 Threshold value Switch off suction"
2 Switch−on threshold Switch on message"
3 Threshold value Switch on suction" (internal)
4 Reset threshold Object gripped" (minimum)
5 Switch on suction" (external)
Fig. 5: Method of operation of the air−save function
With active air−save function:
Vacuum generation is switched off as soon as the vacuum is more than the threshold value 1 and is
switched on again as soon as the vacuum is less than the threshold value 3.
The threshold values are defined as follows:
Threshold value Switch off suction" 1
Threshold value 1 is equal to the switch−on threshold value 2 of the output Out A (è Fig. 5: ) set by
the customer, i.e. the vacuum generator is switched off when the output Out A is set.
Threshold value Switch off suction" 3
Threshold value 3 lies between the switch−on threshold 2 and the reset threshold 4 (switch−on
threshold minus the adjustable hysteresis) of the output Out A at a gap of 50 mbar from the reset
threshold. This is to prevent the reset threshold from being reached.