| 10 | Insufficient voltage | DC bus voltage below 200V | Check input voltage and contactor | Stabilize power supply |
| 13 | Software processing error 1 | CPU processing error | Check repeatability and grounding | Replace unit |
| 15 | Memory error 2 | Self-diagnosis error RAM/ROM | Hardware defect on control board | Replace unit |
| 17 | A/D converter error | Analog-to-digital conversion error | Interference or hardware defect | Check grounding or replace unit |
| 18 | Initial communication error | No communication with encoder at startup | Check encoder cable and CN2 connector | Replace cable or check encoder |
| 22 | LSI error | Internal communication error (LSI) | Control board defective | Replace unit |
| 24 | Grounding | Ground fault in motor or cable | Check insulation resistance of motor line | Repair cable or motor |
| 25 | Absolute position data lost | Absolute value lost | Check battery voltage | Replace battery, reset reference point |
| 2B | Motor side detector: CPU error 1 | Internal encoder error | Encoder environment (vibration/temp) | Replace encoder |
| 2C | EEPROM/LED error | Encoder data memory error | Encoder aging | Replace encoder |
| 2D | Data error | Incorrect position data | Interference on encoder line | Check shielding or replace encoder |
| 2F | Communication error | Communication loss with encoder | Cable break or strong EMI | Check cable, optimize grounding |
| 30 | Over regeneration | Braking energy too high | Check resistance value and SV036 | Increase cycle time or use ext. resistor |
| 31 | Overspeed | Motor speed above limit | Check parameters and encoder feedback | Adjust acceleration ramp |
| 32 | Power module overcurrent | Overcurrent in power module | Short circuit motor/cable, IPM defective | Check motor/cable, replace drive |
| 33 | Overvoltage | DC bus voltage above 400V | Check regen resistor and line voltage | Connect/check resistor |
| 34 | NC-DRV communication: CRC error | Data error in NC bus | Check SH21 cable and terminator | Replace cable |
| 35 | NC command error | Invalid command from NC | Check CNC program and parameters | Check controller settings |
| 36 | Communication error (NC) | NC bus interruption | Check CN1A/B connectors, cable | Reconnect or replace cable |
| 37 | Initial parameter error | Parameter out of range | Check motor type (SV025) and gear factors | Correct parameters |
| 38 | Protocol Error 1 | Communication protocol error | Hardware incompatibility or defect | Check cable, replace unit |
| 39 | Protocol Error 2 | Communication protocol error | Hardware incompatibility or defect | Check cable, replace unit |
| 3A | Overcurrent | Motor current too high | Check load inertia, gain (VGN1) | Adjust parameters, check mechanics |
| 3C | Regeneration circuit error | Brake circuit / fan error | Check fan function, transistor short | Clean/replace fan, repair unit |
| 46 | Motor overheat | Motor too hot | Overload, ambient temperature | Reduce load, improve cooling |
| 4F | Instantaneous power interruption | Power failure > 50ms | Check input voltage, grid stability | Check supply |
| 50 | Overload 1 | Thermal overload (long-term) | Check machine load, friction, motor size | Reduce cutting conditions |
| 51 | Overload 2 | Max load exceeded (short-term) | Collision, mechanical blockage | Clear mechanics |
| 52 | Excessive error 1 | Following error too large (Servo ON) | Torque limit, acceleration | Adjust parameter SV023 |
| 53 | Excessive error 2 | Following error too large (Servo OFF) | Mechanical drift, brake | Check brake, parameter SV026 |
| 55 | External emergency stop error | External E-Stop active | E-Stop circuit, contactor feedback | Release E-Stop, check wiring |
| 58 | Collision detection 1: G0 | Collision detected in rapid traverse | Mechanics, obstacles in path | Remove cause of collision |
| 59 | Collision detection 1: G1 | Collision detected in cutting feed | Tool break, excessive feed | Check cutting parameters |
| 5A | Collision detection 2 | Maximum torque reached | Mechanical overload | Reduce load |
| 5F | External contactor welding | Main contactor stuck | Check contactor contacts for welding | Replace contactor |
| 88 | Watchdog | System crash hardware/software | EMI interference, control board | Replace unit |