I want to make an application for monitoring KUKA robot current state. And there I want to send data about current power consumption but couldn't find any system variable which could be useful for me.
So, the question is is there a posibility to get info about power consumption without additional tech packages or any additional modules?
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In KSS 8.3 there is a feature for measuring the energy consumption of robot and cabinet combined, see section 4.16 in the documentation for System Integrators
You have to find out whether your robot type supports that feature or ask KUKA.
I do not know whether you are familiar with the trace / oscilloscope functionality mentioned above. The trace group mentioned can be configured in the menu Diagnosis->Trace->Configuration and viewed via Diagnosis->Trace->Oscilloscope. There seems to be no documentation on the meaning of the recorded channels but you can probably interpret without much explanation.
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The system variable $curr_act is cyclically updated and gives you the current in amps for each axis...