An abrasive filter assembly with an integral dust collection system. The array includes a first light emitting diode with a first electrode and a second light emitting diode with a second electrode. A cooling module comprises a cooling housing, which is fluidically connected to the machine housing by means of a first cooling fluid connection area in a housing wall of the machine housing and to at least one second cooling fluid connection area in the housing wall of the machine housing. In a modulation state transition phase, the first and third signals delivered by the first and third generators are at a different frequency from the carrier frequency of the signals delivered by the second generator. The complex alcohol ester composition can be used a lubricant agent.