An arrangement configured to monitor a condition of a rotating system comprising a main bearing 110, the monitoring arrangement comprising: a first measurement device 114 configured to be arranged at a first location in proximity of the main bearing for determining a first measurement indicative of an electric current flow at the first location, and a control unit 120 connected to the measurement device, wherein the control unit is further configured to: form a first parameter based on the first measurement; match the first parameter with a plurality of predetermined current flow profiles, each of the plurality of predetermined current flow profiles being indicative of a condition of the rotating system; and determine, if a matching current flow profile is found, a relevance level for the corresponding condition; characterized in that the control unit is further configured to: provide an indication of an alarm if the relevance level is above a predetermined threshold, the arrangement further comprises a second measurement device 116 configured to be arranged at a second location in proximity of the main bearing, on the other side of the main bearing, for determining a second measurement indicative of a current flow at the second location, the control unit being connected to the measurement device, wherein the first parameter is determined based on a difference between the first and the second measurement corresponding to a current flowing through the main bearing. a first measurement device 114 configured to be arranged at a first location in proximity of the main bearing for determining a first measurement indicative of an electric current flow at the first location, and a control unit 120 connected to the measurement device, wherein the control unit is further configured to: form a first parameter based on the first measurement; match the first parameter with a plurality of predetermined current flow profiles, each of the plurality of predetermined current flow profiles being indicative of a condition of the rotating system; and determine, if a matching current flow profile is found, a relevance level for the corresponding condition; characterized in that the control unit is further configured to: provide an indication of an alarm if the relevance level is above a predetermined threshold, the arrangement further comprises a second measurement device 116 configured to be arranged at a second location in proximity of the main bearing, on the other side of the main bearing, for determining a second measurement indicative of a current flow at the second location, the control unit being connected to the measurement device, wherein the first parameter is determined based on a difference between the first and the second measurement corresponding to a current flowing through the main bearing. form a first parameter based on the first measurement; match the first parameter with a plurality of predetermined current flow profiles, each of the plurality of predetermined current flow profiles being indicative of a condition of the rotating system; and determine, if a matching current flow profile is found, a relevance level for the corresponding condition; characterized in that the control unit is further configured to: provide an indication of an alarm if the relevance level is above a predetermined threshold, the arrangement further comprises a second measurement device 116 configured to be arranged at a second location in proximity of the main bearing, on the other side of the main bearing, for determining a second measurement indicative of a current flow at the second location, the control unit being connected to the measurement device, wherein the first parameter is determined based on a difference between the first and the second measurement corresponding to a current flowing through the main bearing. provide an indication of an alarm if the relevance level is above a predetermined threshold, the arrangement further comprises a second measurement device 116 configured to be arranged at a second location in proximity of the main bearing, on the other side of the main bearing, for determining a second measurement indicative of a current flow at the second location, the control unit being connected to the measurement device, wherein the first parameter is determined based on a difference between the first and the second measurement corresponding to a current flowing through the main bearing.