4
Project planning
4.1
Manufacturer of the machine
DANGER
Failure to comply with manufacturer’s obligations
Hazard due to lack of effectiveness of the protective device
b
Carry out a risk assessment before using the safety switch.
b
Do not tamper with, open, or modify the components of the safety switch.
b
Do not repair defective devices – they must be replaced instead.
b
Make sure that switch-on commands which bring about a dangerous state of the
machine are not enabled until the protective device is closed.
b
Ensure that a stop command is triggered if the actuator is no longer detected (e.g.
when opening the protective device when the machine goes into a dangerous
state).
b
The safety switches must not be defeated (contacts jumpered), rotated away,
removed, or rendered ineffective in any other way. If necessary, put measures in
place to reduce possibilities for defeat.
If several devices are connected in series (safe series connection) and the simplified
process according to EN ISO 13849 is used to determine the performance level (PL),
the PL may be reduced.
The response time increases with the number of safety switches in a series connection.
4.2
Operating entity of the machine
DANGER
Failure to comply with operating entity’s obligations
Hazard due to lack of effectiveness of the protective device
b
Modifications to the machine and modifications to the mechanical mounting of
the safety switch necessitate a new risk assessment. The results of this risk
assessment may require the operating entity of the machine to fulfill the manufac‐
turer’s obligations.
b
Apart from during the procedures described in this document, the components of
the safety switch must not be opened or modified.
b
Do not perform repair work on the components. Improper repair of the safety
switch can lead to a loss of the protective function.
b
Ensure that there is no bypassing by replacement actuators. Restrict access to
actuators.
4.3
Design
DANGER
Bypassing the protective device
Hazard due to lack of effectiveness of the protective device
b
Prevent incentives to manipulate the safety switch by taking at least one of the fol‐
lowing measures:
°
Only for universally coded variants: Cover the sensor and the actuator with
additional equipment or protect them against access.
°
If possible use permanent mounting methods for actuators (e.g., glue, safety
screws, or rivets).
PROJECT PLANNING
4
8018754/12IU/2020-01-30 | SICK
O P E R A T I N G I N S T R U C T I O N S | STR1
11
Subject to change without notice
