Initial Start-Up; Electrical Connection; Mode Of Operation Of The Safety Outputs; Requirements For The Connected Safety-Monitoring Module - Wenglor SD4RAS0 N89 Série Notice D'instructions

6. Initial Start-Up

6.1. Electrical connection

• The electrical connection may only be carried out by authorised personnel in a de-energized
condition.
• The safety outputs can be integrated in the safety circuit of the control system.
• For applications of PL e / control category 4 to EN ISO 13849­1, the safety outputs of the safety switch or
of the sensor chain must be wired to a safety monitoring­module of the same control category.

6.1.1. Mode of operation of the safety outputs

• The opening of a safety guard, i.e. the actuator is removed out of the active zone of the sensor, will imme­
diately disable the safety outputs of the sensor (switching distances refer to technical data).
• Any error that does not immediately affect the functionality of the safety switch (e.g. too high the ambient
temperature, interference potential at a safety output, cross­wire short) will lead to a warning message, the
disabling of the signal output and the delayed shut­down of the safety outputs.
• The safety outputs are disabled if the error warning is active for 30 minutes.
• This signal combination, signal output disabled and safety channels still enabled, can be used to stop the
production process in a controlled manner.
• After fault rectification, the error message is reset by opening and re­closing the corresponding safety
guard. The safety outputs enable and allow a restart.
• The user must evaluate and design the safety chain in accordance with the relevant standards and
the required safety level.

6.1.2. Requirements for the connected safety-monitoring module

• Dual­channel safety input, suitable for p­type sensors with NO function
• If the safety switch is wired to relays or to non­safety relevant control components, a new risk analysis
must be carried out.
• The safety outputs of the sensors are tested by cyclic switch­off.
• The safety­monitoring module does not need to be equipped with a cross­wire short detection.
• The switch­off times must be tolerated by the safety­monitoring module.
• The switch­off time of the safety switch is supplementary extended in accordance with the cable length
and the capacity of the cable used.
• The typical switch­off time for 30 m connecting cable is 250 μs.

6.1.3. Series-wiring

• Series­wiring can be set up.
• The response and risk times are not altered by wiring in series.
• The number of components is only limited by the external cable protection according to the technical data
and the line loss.
• Protection is not required when pilot wires are laid.
• The cables however must be separated from the supply and energy cables.
• The max. fuse rate for a sensor chain depends on the section of the connecting cable of the sensor.
Safety Switch RFID
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