GE VersaSafe VersaPoint IC220SDL840 User Manual page 58

6
6-4
Cat. 3
– Use proven safety principles.
– Use appropriately qualified actuators (see Section "Requirements for controlled
devices/actuators" on page 2-5).
– Please note that mechanical failure of the switching device can result in the loss of the
safety function.
– Prevent the welding of contacts with appropriate protection against overcurrent and
surge voltage.
– All errors (e.g., cross circuits) 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.
– Test the shutdown capability of the actuators at regular intervals.
Cat. 4
– Use proven safety principles.
– Use appropriately qualified actuators (see Section "Requirements for controlled
devices/actuators" on page 2-5).
– Please note that mechanical failure of the switching device can result in the loss of the
safety function.
– Prevent the welding of contacts 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 (e.g., cross circuits) 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.
– Test the shutdown capability of the actuators at regular intervals.
User manual IC220SDL840 - May 2018
GFK-2734