Examples:
•
Stop criteria: Occasionally the airWiper cannot remove all contamination. Without
a stop criterion, the controller would trigger the airWiper again and again. This can
lead to increased energy consumption or premature draining of the compressed
air tank. If configured appropriately, the controller will abort cleaning after a rea‐
sonable time. In most cases, the optimum cleaning effect is achieved after a
maximum of 10 cleaning steps.
•
Exclusion conditions: In certain situations, cleaning should not take place, for
example when the vehicle is stationary and there is temporarily a particularly
large amount of water present. If configured appropriately, the controller will ignore
signals that normally trigger the airWiper in such cases.
Depending on your application, you can implement the stop criteria and exclusion
conditions using a controller or using relays, switches, etc.
A
B
S
V
p
p
t
t
t
3
2
5
1
4
Figure 3: Single stage cleaning
S
Trigger signal of the safety laser scanner, e.g., contamination warning, warning field
A
Compressed air in channel A
B
Compressed air in channel B
V
Voltage
p
Pressure
t
Time
1
Stop condition: the cleaning process ends at this time at the latest, even if the contamina‐
tion has not been removed
2
Cleaning with channel A and B
3
Pause
4
Cleaning step
5
Cleaning process
4
PROJECT PLANNING
12
O P E R A T I N G I N S T R U C T I O N S | airWiper
8027429/2022-05-20 | SICK
Subject to change without notice