Method for Information Exchange Between an External Recipient and a Pump

A method for information exchange between an external receiver and a pump comprising:

• providing an electric motor as pump drive and a frequency inverter for the speed-regulated control of the motor, wherein the pump generates an acoustic information signal that is detectable by the external receiver;
• and
• varying at least one operating parameter of the frequency inverter while the pump is operating normally, in such a manner that the pump, while it is operating normally, delivers an acoustic information signal that is detectable by the external receiver.

The method as claimed in 17, wherein the variation of the switching frequency takes place in a time-synchronized manner in order to allow a binary data sequence to be transmitted.

The method as claimed in 18, wherein the variation of the switching frequency takes place in a time-synchronized manner in order to allow a binary data sequence to be transmitted.

The method as claimed in 19, wherein the variation of the switching frequency takes place in a time-synchronized manner in order to allow a binary data sequence to be transmitted.