Abstract: A cutter assembly configured for a grinder pump and including a cutter wheel and a cutter disc that interact with each other. The cutter wheel includes a shaft portion that is configured to interact with a central hole of the cutter disc, a hub portion that is connected to the shaft portion and at least two main cutting edges that in the radial direction extend outwards from the hub portion and that are configured to interact with a set of cutting holes of the cutter disc. The shaft portion includes an axially extending cutting recess. The hub portion includes only one radially extending cutting recess. The cutter disc includes a suction side, a central hole that is configured to interact with the shaft portion of the cutter wheel and a set of cutting holes that open in the suction side radially outside the central hole.

Abstract: A method for controlling a pump in connection with first activation of the individual pump following a connection of the individual pump to a power supply. The pump is configured to be connected to a Pump Network including a plurality of pumps. When connecting the individual pump to the power supply, the method includes causing the individual pump to remain deactivated, determining a value of at least one Operational parameter (OP) of the individual pump, determining a Reference input value (RIV) based on the determined value of the at least one Operational parameter (OP), utilizing the determined Reference input value (RIV) in a Random pause time function (RF) and obtaining a random Activation pause time (APT) as an output from the Random pause time function (RF), and permitting activation of the individual pump after the Activation pause time (APT) has elapsed.

Abstract: A cutter assembly configured for a grinder pump and including a cutter wheel and a cutter disc that interact with each other. The cutter wheel includes a shaft portion that is configured to interact with a central hole of the cutter disc, a hub portion that is connected to the shaft portion and at least two main cutting edges that in the radial direction extend outwards from the hub portion and that are configured to interact with a set of cutting holes of the cutter disc. The shaft portion includes an axially extending cutting recess. The hub portion includes only one radially extending cutting recess. The cutter disc includes a suction side, a central hole that is configured to interact with the shaft portion of the cutter wheel and a set of cutting holes that open in the suction side radially outside the central hole.

Abstract: A method for providing an axial gap in a cutter assembly of a grinder pump in order to secure an operative shearing action at a shearing interface in the cutter assembly. A grinder pump includes a cutter wheel connected to and driven in rotation by a drive shaft. The cutter wheel includes a set of cutting edges, and a cutter disc stationary connected to a pump housing and having a central hole and a set of cutting holes. The drive shaft and the cutter wheel are interconnected via the central hole of the cutter disc, wherein the cutter wheel and the cutter disc constitute the cutter assembly. A shim, which has a thickness equal to or greater than 0.05 millimeters and equal to or less than 0.15 millimeters and that is manufactured from degradable paper or plastic material, is clamped between the cutter wheel and the cutter disc.