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Method for monitoring a drive device for a standstill condition, monitoring system therefore, and drive system therefore

  • US 7,482,771 B2
  • Filed: 10/10/2005
  • Issued: 01/27/2009
  • Est. Priority Date: 10/18/2004
  • Status: Active Grant
First Claim
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1. A method for monitoring a drive device, comprising the steps of:

  • providing a monitoring device to apply a monitoring input signal, which changes over time, to a drive device at a standstill;

    modulating commensurate with the monitoring input signal a sensor output signal of a sensor device, which is connected to the drive device, in response to the monitoring input signal, when the sensor device functions properly;

    wherein the monitoring device receives the sensor output signal;

    wherein the monitoring device monitors the sensor output signal for the presence of a signal component which corresponds to the monitoring input signal; and

    wherein the monitoring device activates a safety device to transfer the drive device into a safe state, when the monitoring device ascertains the absence of the signal component corresponding to the monitoring input signal.

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