Monitoring assembly and system having a monitoring assembly

A monitoring assembly for monitoring a supply signal of an electrically operated component, comprising:

• a monitoring circuit and a control and evaluation unit assigned to the monitoring circuit,
• wherein at least one galvanically isolated connection is provided between the monitoring circuit and the control and evaluation unit assigned to the monitoring circuit,
• wherein the monitoring circuit includes at least one threshold-dependent component which is set up to generate a current signal as a function of an applied supply voltage of the supply signal, and presented as an AC voltage, wherein the monitoring circuit is set up to transmit at least one output signal to the control and evaluation unit, which corresponds to the current signal generated by the at least one threshold-dependent component, wherein the at least one threshold-dependent component is configured so as to generate the current signal when the supply voltage is above a first threshold value,
• wherein the control and evaluation unit is set up to evaluate the at least one transmitted output signal to determine a fault condition,
• wherein the control and evaluation unit is set up to output a drive signal when the fault condition has been determined,
• wherein the monitoring assembly has a power supply unit having an AC/DC converter, a sensor being assigned to the power supply unit, which senses a voltage value at the output of the power supply unit and transmits it to the control and evaluation unit, wherein the voltage value is a low-voltage level,
• wherein the AC/DC converter is set up to output an output voltage up to a second threshold value for the supply signal, wherein the second threshold value is below the first threshold value, and
• wherein the control and evaluation unit is set up to detect the fault condition if a failure of the output voltage and a failure of the at least one output signal occur simultaneously, irrespective of the duration of the failure of the at least one output signal.

A monitoring assembly for monitoring a supply signal of an electrically operated component, comprising:

• a monitoring circuit and a control and evaluation unit assigned to the monitoring circuit,
• wherein at least one galvanically isolated connection is provided between the monitoring circuit and the control and evaluation unit assigned to the monitoring circuit,
• wherein the monitoring circuit includes at least one threshold-dependent component which is set up to generate a current signal as a function of an applied supply voltage of the supply signal, and presented as an AC voltage, wherein the monitoring circuit is set up to transmit at least one output signal to the control and evaluation unit, which corresponds to the current signal generated by the at least one threshold-dependent component, wherein the at least one threshold-dependent component is configured so as to generate the current signal when the supply voltage is above a first threshold value,
• wherein the control and evaluation unit is set up to evaluate the at least one transmitted output signal to determine a fault condition,
• wherein the control and evaluation unit is set up to output a drive signal when the fault condition has been determined,
• wherein the control and evaluation unit is set up to determine a duration of a failure of the at least one output signal, wherein the control and evaluation unit is set up to compare the duration with a defined period of time to detect the fault condition if the duration of the failure is longer than the defined period of time, and
• wherein the control and evaluation unit is set up to detect the fault condition if a failure of the output voltage and a failure of the at least one output signal occur simultaneously, irrespective of the duration of the failure of the at least one output signal.