Delta Fault Code Reference

AL.003 indicates the output current exceeded the drive maximum allowable current. Common causes include motor cable short circuits, ground faults, rapid acceleration/deceleration, and motor winding insulation degradation. To resolve: 1) Disconnect motor cables and measure insulation resistance, 2) Check motor winding phase-to-phase resistance for balance, 3) Increase acceleration/deceleration times (P1-09, P1-10), 4) Verify current limit parameter (P1-02), 5) Confirm motor-drive rating match.

oC occurs during steady-state operation, oC-A during acceleration, oC-d during deceleration, and oC-n during constant speed. For all variants: measure motor cable insulation resistance first. For oC-A, increase acceleration time (Pr.01-12) and check torque boost (Pr.01-06). For oC-d, increase deceleration time (Pr.01-13) and consider installing a braking resistor. For oC-n, investigate sudden load changes and check motor winding condition.

oV occurs when the DC bus voltage exceeds approximately 410V, typically during deceleration when regenerative energy flows back to the drive. Solutions: 1) Increase deceleration time (Pr.01-13), 2) Install or verify braking resistor operation, 3) Enable deceleration overvoltage prevention (Pr.01-14), 4) Measure input supply voltage to confirm it is within AC 200-240V or 380-480V range, 5) For high-inertia loads, consider installing a braking unit.

ERR-02 indicates the program scan time exceeded the watchdog timer setting, typically caused by infinite loops, excessive computation, or heavy communication load. To resolve: 1) Monitor actual scan time in ISPSoft, 2) Optimize program by removing unnecessary loops, 3) Consider increasing the watchdog timer value cautiously, 4) Distribute processing across multiple tasks, 5) Adjust communication processing intervals to reduce scan-time impact.

AL.005 indicates encoder signal failure. Systematically check: 1) Encoder cable and CN2 connector for secure connections, 2) Encoder supply voltage (should be 5V), 3) Encoder shield grounding (single-point grounding principle), 4) Encoder A/B/Z phase output waveforms using an oscilloscope, 5) Encoder resolution setting (P1-46) matches the actual encoder specification, 6) Replace encoder or cable if all checks pass but error persists.

For Modbus timeout (CE-01) and VFD communication timeout (CF3): 1) Inspect RS-485 cable connections (A+, B- polarity), 2) Verify 120-ohm termination resistors at both ends of the bus, 3) Confirm matching baud rate, data bits, parity, and stop bits, 4) Check for duplicate station addresses, 5) Use a communication monitoring tool to verify actual data exchange, 6) Check cable shielding and grounding for EMC interference.

AL.009 indicates the actual position deviates from the command position beyond the allowable range. Causes include low servo gains, increased mechanical resistance, sudden load changes, or encoder signal issues. Solutions: 1) Adjust position deviation tolerance (P1-39), 2) Increase position loop gain (P2-00) and speed loop gain (P2-04), 3) Inspect mechanical load and friction, 4) Verify encoder signals, 5) Re-run auto-tuning (P2-32).

MC-02 occurs when the origin return operation fails to detect the home sensor. Troubleshooting steps: 1) Verify home sensor (proximity sensor or limit switch) operation, 2) Confirm the sensor input signal reaches the PLC correctly, 3) Check homing mode parameter settings, 4) Verify homing speed parameters (high-speed and low-speed approach), 5) Inspect sensor wiring and input address assignment. Ensure the mechanical stopper position and sensor alignment are correct.