58 Leroy-Somer generator fault/alarm codes with symptom, cause and remedy — compiled from Leroy-Somer service and controller documentation.
| Code | Meaning / symptom | Cause | Remedy |
|---|---|---|---|
| 00-1 | Generator set emergency stop | ||
| 01-1 | External emergency stop | ||
| 02-1 | Engine oil pressure | ||
| 03-1 | Engine water temperature | ||
| 04-1 | Daily fuel tank level low | ||
| 05-1 | Radiator water level low | ||
| 06-1 | Alternator overload or short-circuit | ||
| 07-1 | Engine overspeed | ||
| 08-1 | Max. battery voltage | ||
| 09-1 | Max. alternator voltage | ||
| 12-1 | Max. alternator frequency | ||
| 25-0 | Normal contactor open (system side) | ||
| 26-0 | Emergency contactor open (generating set side) | ||
| 27-1 | Oil temperature | ||
| 28-1 | Oil level low | ||
| 34-1 | Battery charger fault | ||
| 46-1 | Main circuit breaker open | ||
| 47-0 | Overload | ||
| AC.Lt | Drive is in current limit. | See Menu 10 in the Digidrive SK Advanced User Guide | |
| C.Acc | SmartStick read/write fail. | Bad connection or faulty SmartStick | |
| C.Err | SmartStick data error. | Bad connection or memory corrupt within SmartStick | |
| C.dAt | SmartStick data does not exist. | New/empty SmartStick being read. Reset the drive. | |
| FAIL | Failed attempt to read stick. | An attempt was made to read the stick when the drive was not disabled or tripped, or the stick is read only | |
| FdL | Field loss condition | ||
| HF06 | Unexpected interrupt | Hardware fault - return to supplier | |
| HF07 | Watchdog failure | Hardware fault - return to supplier | |
| HF08 | Interrupt clash | Hardware fault - return to supplier | |
| HF11 | Access to the EEPROM failed | Hardware fault - return to supplier | |
| HF17 | No comms from power processor | Hardware fault - return to supplier | |
| HF19 | Flash failure | Hardware fault - return to supplier | |
| HF21 | Power processor - Watchdog failure | Hardware fault - return to supplier | |
| HF22 | Power processor - Unexpected interrupt | Hardware fault - return to supplier | |
| HF23 | Power processor - Level overrun | Hardware fault - return to supplier | |
| HF24 | Power processor - No frequency at power up | Hardware fault - return to supplier | |
| HF29 | Fan fault | Hardware fault - return to supplier | |
| HFxx | Hardware faults. | Internal drive hardware fault (see Digidrive SK Advanced User Guide) | |
| It.AC | I2t on drive output current | Excessive mechanical load High impedance phase to phase or phase to ground short circuit at drive output | Drive requires re-autotuning to motor |
| It.br | I2t on braking resistor | Excessive braking resistor energy | |
| Motor thermistor trip | Excessive motor temperature | ||
| O.Ld1* | User +24V or digital output overload | Excessive load or short circuit on +24V output | |
| O.SPd | Over speed | Excessive motor speed (typically caused by mechanical load driving the motor) | |
| O.cL | Overload on current loop input. | Input current exceeds 25mA | |
| O.ht1 | FXMP5 overheat (SCR junction) based on thermal model | Reduce ambient temperature or field current. Check the fans are operating and venting is not blocked. | |
| O.ht2 | Heatsink over temperature | Reduce ambient temperature or field current. Check the fans are operating and venting is not blocked. | |
| O.ht3 | Drive over-heat based on drive | ||
| O.ht4 | Power module rectifier over temperature. | ||
| OI.AC** | Drive output instantaneous over current | Insufficient ramp times Phase to phase or phase to ground short circuit on the drives output | Drive requires autotuning to the motor |
| OI.br** | Braking resistor instantaneous over current | Excessive braking current in braking resistor Braking resistor value too small | |
| OV | DC bus over voltage | Deceleration rate set too fast for the inertia of the machine. Mechanical load driving the motor | |
| OVL.d | I x t overload (I = current, t = time). | Reduce motor current (Load) hot Heatsink/IGBT temperature high Reduce ambient temperature or reduce motor current | |
| Oil pressure fault/shutdown | Red LED on | ||
| PH | Input phase imbalance or input phase loss. | One of the input phases has become disconnected from the drive (not dual rated drives) | |
| SCL | Serial communications loss time-out. | ||
| UV | DC bus under voltage | Low AC supply voltage Low DC bus voltage when supplied by an external DC power supply | |
| br.rS | Braking resistor overload. | See Menu 10 in the Digidrive SK Advanced User Guide | |
| cL1 | Analog input 1 current mode, current loss. | Input current less than 3mA when 4-20 or 20-4mA modes selected | |
| rS | Failure to measure motors stator resistance. | Motor too small for drive Motor cable disconnected during measurement | |
| tunE | Autotune stopped before completion | Run command removed before autotune complete |
Compiled from Leroy-Somer service manuals and controller documentation. Cause/remedy shown where extracted; always verify against the manual for your exact model.
Drive is in current limit.. Remedy: See Menu 10 in the Digidrive SK Advanced User Guide.
SmartStick read/write fail.. Cause: Bad connection or faulty SmartStick.