10
Maintenance
The safety light curtain is maintenance-free. Depending on the ambient conditions, reg‐
ular cleaning is required.
10.1
Safety
DANGER
Hazard due to lack of effectiveness of the protective device
Persons and parts of the body to be protected may not be recognized in case of non-
observance.
b
Do not do repair work on device components.
b
Do not make changes to or manipulate device components.
b
Apart from the procedures described in this document, the device components
must not be opened.
10.2
Regular cleaning
Overview
Depending on the ambient conditions of the safety light curtain, the front screens must
be cleaned regularly and in the event of contamination. Static charges can cause dust
particles to be attracted to the front screen. The weld spark guard and deflector mirrors
must be cleaned regularly and in the event of contamination.
Important information
DANGER
Hazard due to lack of effectiveness of the protective device
Persons and parts of the body to be protected may not be recognized in case of non-
observance.
b
Regularly check the degree of contamination on all components based on the
application conditions.
b
Observe the information concerning test rod testing.
DANGER
Hazard due to lack of effectiveness of the protective device
Persons and parts of the body to be protected may not be recognized in case of non-
observance.
b
Make sure that the optical properties of the front screens of the twin sticks are not
changed, e.g., by:
°
beading water, mist, frost, or ice formation. If applicable, remove films or
other types of contamination, disconnect the voltage supply of the twin stick
and then switch it back on.
°
Scratches or damage. Replace the device if the front screen is scratched or
damaged.
b
Make sure that all reflective surfaces and objects maintain a minimum distance
from the protective field.
b
Make sure that no dispersive media (e.g., dust, fog, or smoke) are within the calcu‐
lated minimum distance from the protective field.
MAINTENANCE
10
8012624/10OM/2018-08-09 | SICK
O P E R A T I N G I N S T R U C T I O N S | miniTwin4
81
Subject to change without notice