| F-100 | Inverter Output Overcurrent | Motor cable short circuit, insulation problem, power section overload | Check U/V/W for short circuit, insulation measurement motor side disconnected, check load profile | Repair motor/cable, reduce parameters/load, check drive |
| F-300 | Inverter Input Overcurrent | Mains side overload, upstream components faulty | Check mains supply, fuses, feed-in, DC link | Stabilize feed-in, eliminate source of error |
| F-400 | Inverter Overvoltage | Overvoltage in the DC link during braking/regeneration | Check mains voltage, braking resistor, braking chopper, deceleration ramp | Repair braking circuit, adjust ramps |
| F-700 | Inverter Output Overload | Continuous overload, mechanical stiffness | Check load meter/currents, spindle mechanics, bearing run | Repair mechanics, adjust machining parameters |
| F-800 | Excess Speed Deviation | Slip too large, feedback implausible | Check encoder signals, connectors, shielding, parameters | Repair encoder/cable, parameter adjustment |
| F-500 | Motor Overspeed | Speed > limit value (C1-26) | Check setpoint/actual speed, control parameters, encoder | Set limit values/parameters correctly, check encoder circuit |
| F-900 | Motor Thermal Error 1 | Motor temperature too high | Check cooling, fan/chip/oil load, load profile | Clean/improve cooling, reduce load |
| F-902 | Motor Thermal Error 3 | Temperature sensor cable interrupted | Check thermal circuit, connector, cable for break | Repair cable/connector |
| F-903 | Heat Sink Thermal Error 1 | Heat sink temperature in the inverter too high | Check drive fan, air guidance, cabinet temperature | Replace fan/filter, improve air guidance |
| F-302 | Cooling Fan Error | Fan defective | Check fan operation, supply, contamination | Replace fan, perform cleaning |
| F-C00 | Break in Speed Detection Signal Cable | Encoder cable/speed signal cable break | Check encoder cable, connector, shielding, bending radii | Repair/replace cable, improve EMC |