METHOD, MONITORING NODE AND COMPUTER PROGRAM OF MONITORING ENERGY FLOW IN A TIGHTENING TOOL

A method performed by a monitoring node associated with a tool communication network of monitoring energy flow in a tightening tool connected to the communication network includes receiving, from the tightening tool, parameter values relating to current fed (I) into the tightening tool, angle (α) of a rotor in the tightening tool and torque (T) applied to a joint by the tightening tool. The method also includes calculating energy input to the tightening tool based on the received parameter values, calculating energy transferred to the joint by the tightening tool based on the received parameter values relating to the torque applied to the joint by the tightening tool and the angle (α) of the rotor in the tightening tool. The method further includes detecting that the calculated energy input deviates from the calculated energy transferred to the joint by more than a predetermined value.