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• AES to monitor a guard door to ControlCategory 3 to EN 954-1• Monitoring one guard industrial doors using a BNSrange magnetic safety sensor.• The feedback circuit monitors the position of the contactors K3 and K4.• Start push button L1 A +24VDC
0V 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 A1 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.• Modification for 2 NC contacts:The safety monitoring module can be modi-fied to monitor two NC contacts by bridging
the terminals A1 and X2. The cross-wiremonitoring between connections then becomes inoperative• 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. A1
A2Y2X2 A1 S13K1 23
24 max.Y1X1K43
K2S14S21S2213 100mA 14 K3A2 AES1235 NM 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 1-111
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