| 摘要 |
The present invention makes possible a safety function for speed monitoring in the case of all induction machines operated on an inverter without a sensor system, in that a determined setpoint stator frequency value (phi5*) is limited and monitored in a two-channel mode in two systems with approximate redundancy, deriving from this in each system respective sets of control signals for the electrical valves of the inverter, which can be compared with one another in two systems of monitoring electronics. In the event of fault detection, two-channel switching off takes place. The circuit arrangement according to the invention can additionally be subjected to enforced dynamization.
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