Abstract: A converter has an AC side to connect to an AC network. A converter control is configured to set a current reference limit to limit a converter current. The converter control is configured to reduce the limit in case a fault is detected in the AC network. There is also described a combination of the converter in a power system with a renewable power source and a corresponding method of operating a converter in a power system with a renewable power source.

Abstract: The invention relates to a lubricant dispenser comprising a storage container (1) filled with lubricant and a pump unit (2) which can be connected to or is releasably connected to the storage container and by means of which the lubricant can be pumped from the storage container (1) to an outlet (5) of the pump unit (2) and is equipped with an electronic controller (35). The lubricant dispenser is characterized in that the storage container (1) is equipped with an electronic coding means (36) which can be connected to the electronic controller (35) of the pump unit (2) and can be read by same so as to transmit information in the assembled state in order to identify the storage container (1).

Abstract: The invention relates to a method of dosing lubricating grease with a lubricant dispenser (1), comprising a lubricant cartridge (3) filled with lubricating grease (2) and holding a plunger (4) for expelling the lubricating grease (2), a spindle (6) driven by a direct-current drive motor (5) for moving the plunger (4), a power supply (7), a controller (8) for operating the motor (5) with a microcontroller (9), and a device (10) for interrupting the motor current flowing through the motor (5). The motor (5) is started up by the controller (8) in adjustable time intervals and a dose of dispensed agent is expressed from the cartridge (3) through a plunger motion with a predetermined plunger stroke. The motor current and the motor voltage are measured during motor operation, and the motor runtime, and the plunger stroke is calculated with the current and voltage measured values and at least one motor characteristic.