4 Electrical connection
4.1 General information for electrical connection
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The electrical connection may only be carried out by authorised personnel in a de-energised condition.
The voltage inputs A1, X1, X2 and IN must have a protection against permanent overvoltage. Supply units
according to EN 60204-1 is recommended.
The required electrical cable fuse protection must be integrated in the installation.
The safety outputs can be integrated into the safety circuit of the control system.
Requirements for the connected safety-monitoring module:
Dual-channel safety input, suitable for 2 p-type semi-conductor outputs
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Configuration of the safety-monitoring module
If the safety sensor is connected to electronic safety-monitoring modules, we recommend that you set a discrepancy time
of min. 100 ms. The safety inputs of the safety-monitoring module must be able blanking a test impulse of approx. 1 ms.
The safety-monitoring module does not need to have a cross-wire short monitoring function, if necessary, the cross-wire
short monitoring function must be disabled.
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Information for the selection of suitable safety-monitoring modules can be found in the Schmersal catalogues or in the
online catalogue on the Internet: products.schmersal.com.
4.2 Serial diagnostic -SD
Cable design
The wiring capacity of the connecting cable of the solenoid interlock must not exceed 50 nF. Depending on the
strand structure, normal unshielded 30 m long control cables LIYY 0.25 mm² to 1.5 mm² have a wiring capacitance
of approx. 3 … 7 nF.
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On wiring SD devices, please pay attention to the voltage drop on the cables and the current carrying capacity of the
individual components.
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Accessories for the series-wiring
For convenient wiring and series-wiring of SD components, the SD junction boxes PFB-SD-4M12-SD (variant for the field)
and PDM-SD-4CC-SD (variant for control cabinet on carrier rail) are available along with additional comprehensive
accessories. Detailed information is available on the Internet, products.schmersal.com.
4.3 Wiring examples for series-wiring
