DESCRIPTION OF FUNCTIONS
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6.2.3.1
Monitoring of the valve switching frequency
When the air saving function is activated and there is a high leakage level in the gripping system, the
ejector switches between the suction and suction-off states very frequently. The number of valve
switching procedures thus increases rapidly within a short time. To protect the ejector and increase its
service life, the ejector switches the air saving function off automatically at a switching frequency of >
6 every 3 seconds and activates continuous suction (i.e. the ejector then remains in the suction state).
It also issues and warning and sets the corresponding condition monitoring bit.
6.2.3.2
Monitoring the evacuation time
If the measured evacuation time t1 (from H2 to H1) exceeds the specified value, the “Evacuation time
longer than t-
1” condition monitoring warning is triggered and the system status light switches to
yellow.
6.2.3.3
Leakage monitoring
In control mode, the loss of vacuum within a certain period is monitored (mbar/s). There are two
possible statuses.
Leakage L < permitted value
Leakage L > permitted value
If the leakage is lower than the set value, the
vacuum continues to fall until it reaches the
switching point H1 - h1, and the ejector starts to
suck again (normal control mode).
The condition monitoring warning is not activated
and there is no effect on the system status light.
If the leakage is higher than the value, the ejector
readjusts immediately.
If the permitted leakage is exceeded twice, the
ejector switches to continuous suction.
The condition monitoring warning is activated and
the system status light switches to yellow.
Vacuum
mbar
time
s
H1
H1-h1
H2
H2-h2
Vacuum On
> 6/3s
