Method for operating a construction-material and/or viscous-material pump for conveying construction material and/or viscous material, and a construction-material and/or viscous-material pump

A method for operating a construction-material and/or viscous-material pump for conveying construction material and/or viscous material, wherein the construction-material and/or viscous-material pump has:

• at least one conveying cylinder, the conveying cylinder being designed to receive and discharge the construction material and/or viscous material,
• at least one conveying piston, the conveying piston being arranged movably in the conveying cylinder in order to take in the construction material and/or viscous material into the conveying cylinder and in order to displace the taken-in construction material and/or viscous material out of the conveying cylinder, and
• a motor system designed to move the conveying piston,
• the method comprising the steps of:
• a) ascertaining a required value (P4B) of a power (P4), or of a variable of the motor system that corresponds to the power, for moving the conveying piston;
• and
• b) depending on the required value (P4B), setting a rotational speed value (n4e) of the motor system such that a power and/or rotational speed reserve value (PnR) between an operating point (BP) and a characteristic curve (KL) of the motor system is equal to or greater than a reserve limit value (PnRG), wherein
• the operating point (BP) is defined by the required value (P4B) of the power (P4) or of the variable and the rotational speed value (n4e),
• the characteristic curve (KL) is defined by maximum values (P4max) of the power (P4) or of the variable and rotational speed values (n4), wherein the maximum values (P4max) differ at least in part for different rotational speed values.