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FWS 2505Fail-To-Safe Standstill MonitorsSafety Category (EN954-1):Features• Confirmation of standstill using 2 impulsesensors• Control Category 3 to EN 954-1• 4 enabling circuits• Available for various operational voltages• Reset input• 2 short-circuit proof semiconductor outputs• 1 N/C auxiliary contact• Integral System Diagnostics (ISD)• 2 channel microprocessor control• Customer-specific standstill frequenciespossible• 24-230VAC/DCDimensions45 x 100 x 121 mmISDThe following faults are recognized by the safety controllerand indicated by means of ISD• Interruption of the connections to the inductiveproximity switches• Short-circuit between connections• Failure of the proximity switches• Failure of one channel being evaluated• Failure of the unit’s internal safety relay to pull-in ordrop-out• Faults on input or relay control circuits of the safetycontrol unitModelDesignationFWS 2505A 24-230V AC/DC (Execution A) FWS 2505C 24-230V AC/DC (Execution C)StandstillFrequenciesExecution AExecution CFunctionTableAdditionaltransistor output YFunction ofoutput Y High (24V)Input X2 1Hz 1HzInput X4 2Hz 1HzY1Y2Enable, Enablingcircuits closedFault conditionOther frequencies on request.Approvals BG UL CSA78