6
6-4
User manual IC220SDL953 - September 2011
GFK-2731
Cat. 3
– Use proven and basic safety principles according to EN ISO 13849-2.
– Use appropriately qualified actuators (see "Requirements for controlled
devices/actuators" on page 2-4).
– Please note that mechanical failure of the switching device can result in the loss of the
safety function.
– Prevent the welding of contacts on the connected contactors or safety relays with
appropriate protection against overcurrent and surge voltage.
– All errors that cannot be detected can result in the loss of the safety function. Take
appropriate measures to prevent such errors. Suitable measures include, for example,
protected cable installation or double insulation. Please note the information in the
following tables.
– Please take into consideration errors with a common cause.
– Ensure that
a single
error does not result in the loss of the safety function.
Cat. 4
– Use proven and basic safety principles according to EN ISO 13849-2.
– Use appropriately qualified actuators (see "Requirements for controlled
devices/actuators" on page 2-4).
– Please note that mechanical failure of the switching device can result in the loss of the
safety function.
– Prevent the welding of contacts on the connected contactors or safety relays with
appropriate protection against overcurrent and surge voltage.
– An accumulation of errors must not result in the loss of the safety function. Following
the third error, evaluation can be aborted if the probability of further errors occurring is
low.
– All errors that cannot be detected can result in the loss of the safety function. Take
appropriate measures to prevent such errors. Suitable measures include, for example,
protected cable installation or double insulation. Please note the information in the
following tables.
– Please take into consideration errors with a common cause.