Fault rectification method for a progressive cavity pump of a conveyor device for conveying viscous building materials

A conveying apparatus for conveying viscous construction materials, the conveying apparatus comprising:

• an eccentric screw pump comprising a rotor/stator unit;
• a drive unit comprising an electric motor;
• and
• a control device that is programmatically configured to:
• monitor a start of a conveying operation of the eccentric screw pump by way of a characteristic-variable-monitoring program of the control device that acquires characteristic-variable values for one or more characteristic variables;
• execute a working-free program if the characteristic-variable values are stored, alone or in combination with one another, as fault values that indicate jamming of the rotor/stator unit of the eccentric screw pump, and wherein the control device is configured to otherwise begin the conveying operation;
• operate the eccentric screw pump in the working-free program in such a way that the electric motor is multiply alternately switched on and switched off, wherein, each time the drive unit is switched on in the working-free program, the drive unit is switched regularly or irregularly alternatively into forward running and into reverse running.

A conveying apparatus for conveying viscous construction materials, the conveying apparatus comprising:

• an eccentric screw pump comprising a rotor/stator unit;
• a drive unit comprising an electric motor;
• and
• a control device that is programmatically configured to:
• monitor a start of a conveying operation of the eccentric screw pump by way of a characteristic-variable-monitoring program of the control device that acquires characteristic-variable values for one or more characteristic variables;
• execute a working-free program if the characteristic-variable values are stored, alone or in combination with one another, as fault values that indicate jamming of the rotor/stator unit of the eccentric screw pump, and wherein the control device is configured to otherwise begin the conveying operation;
• operate the eccentric screw pump in the working-free program in such a way that the electric motor is multiply alternately switched on and switched off;
• stop the working-free program;
• prior to restarting the working-free program, determine occurrence of a restart criterion comprises at least one of:
• a pause time period;
• or
• limit temperature due to cooling of the conveying apparatus;
• and
• in response to the occurrence of the restart criterion, restart the working-free program.

A conveying apparatus that conveys viscous construction materials, the conveying apparatus comprising:

• an eccentric screw pump comprising a rotor/stator unit;
• a drive unit comprising an electric motor;
• and
• a control device that is programmatically configured to:
• monitor a start of a conveying operation of the eccentric screw pump using a characteristic-variable-monitoring program that acquires characteristic-variable values for one or more characteristic variables;
• execute a working-free program if the characteristic-variable values are stored, alone or in combination with one another, as fault values that indicate jamming of the rotor/stator unit of the eccentric screw pump;
• stop the working-free program;
• prior to restarting the working-free program, determine occurrence of a restart criterion comprises at least one of:
• a pause time period;
• or
• limit temperature due to cooling of the conveying apparatus;
• in response to the occurrence of the restart criterion, restart the working-free program;
• count a number of times the working-free program is run;
• and
• in response to the number of times the working-free program is run reaching a threshold number, shut down the conveying apparatus.