Method for operating a delivery apparatus, and delivery apparatus

A method for operating a delivery apparatus for delivering a flowable construction material, wherein the delivery apparatus comprises a control device, an eccentric screw pump having a rotor-stator unit with an outlet, and a drive unit, comprising the steps:

• a target pressure which the eccentric screw pump pumping the flowable construction material is intended to achieve at the outlet or at a delivery section arranged downstream of the outlet is preset at a target-pressure setting device,
• a characteristic variable, in particular a mechanical or electrical power and/or a rotational speed and/or a torque and/or a current of the drive unit of the eccentric screw pump is measured,
• an actual pressure in a region of the outlet of the rotor-stator unit and/or in the delivery section arranged downstream of the outlet is measured by at least one pressure sensor,
• a change in the actual pressure measured by the at least one pressure sensor is related to at least one of the characteristic variables in such a manner,
• wherein, in the event of a rise in the actual pressure above the target pressure, a reduction at least of one of the characteristic variables is brought about by the control device in such a manner that the target pressure is achieved again, and
• wherein, in the event of a pressure drop in the actual pressure below the target pressure, an increase at least of one of the characteristic variables is brought about by the control device in such a manner that the target pressure is achieved again.