Safety sensors Note Wiring diagram
• AES to monitor three guard industrial doors up to Control Category 3 to EN 954-1.• Monitoring 3 guard doors, each with a magnetic safety sensor of the BNS range.• The feedback circuit monitors the position of the contactors K3 and K4.• Start push button S BK13BN21WH22BU1422 WH22 WH H :A start push button (NO) can optionally be connected in the feedback circuit. With theguard door closed, the enabling paths arethen not closed until the start push buttonhas been operated.• If neither start push button nor feedback circuit is used, X1 and S13 must be bridged.• If only one external relay or contactor is used to switch the load, the system can beclassified in Control Category 3 to EN 954-1, if exclusion of the fault “Failure of the exter- nal contactor” can be substantiated and isdocumented, e.g. by using a reliable down-rated contactor. A second contactor leads to an increase in the level of security by redundant switching to switch the load off.• Expansion of enable delay time:The enable delay time can be increased from 0.1 s to 1 s by changing the position of a jumper link connection under the coverof the unit.

L1 24VAC NNM

A1S13 K1K2 K3 K3 K4 K4S1S2S3 24VDC

AES1185

14A2S14S22S14S22 3 S14S22X113 14 BU14 BU21 BN21 BN13 BK13 BK ISD Note
The following faults are registered by the safety monitoring modules and indicated by ISD The wiring diagram is shown with guard doors closed and in de-energised condition.The ISD tables (Intergral System Diagnostics) for analysis of the fault indications and their causes are shown in the appendix. • Failure of door contacts to open or close • Cross-wire or short-circuit monitoring of the switch connections• Interruption of the switch connections• Failure of the safety relay to pull-in or drop-out• Fault on the input circuits or the relay controlcircuits of the safety monitoring module 1-109