The sudden current jump in your 200 kW HAZEMAG HUV-1020 impact crusher when accelerating above 50 Hz on the Optidrive P2 is likely due to a rapid increase in load torque that exceeds the motor’s rated capacity; up to 50 Hz the drive handles acceleration smoothly, but beyond that, either the crusher rotor encounters higher mechanical resistance from material impact, a jam, or stiff bearings, or the drive’s voltage/frequency (V/f) scaling and torque limits are insufficient, causing the motor to draw excess current to maintain speed, so the issue could be mechanical (rotor, bearings, coupling, or feed material), electrical (supply voltage sag or connection issues), or related to drive settings, and should be investigated by checking torque vs speed, drive configuration, mechanical system condition, and supply stability.

Is this a new installation/ new startup? Or has this been running fine for an extended period, and then the problem appeared suddenly? Or has this problem been getting worse over time? What is the motor voltage rating? You mention "Supply voltage: 400 V". Is this the voltage you measured with a volt meter at the VFD input? Is this utility-powered or generator-powered? (we have experienced VFDs faulting out on generator power) Are you in the US and using a transformer? Or is this location outside the US with utility supply of 400V? Above suggestions are great suggestions by 'Automation by Ravi'.