Nidec & Control Technique Commander SE Drive Fault Codes:
| Fault Code and Meaning | Cause and Remedy |
|---|---|
| UU (1) DC link under voltage | Cause: Low AC supply voltage. Low DC link voltage when supplied by external DC power supply. Remedy: Check power supply voltage. |
| OU (2) DC link over voltage | Cause: Excessive inertia in the machine during deceleration. Deceleration rate set too fast for inertia of machine. Remedy: Adjust deceleration ramp times. Check for overvoltage trip levels (200V units: 420VDC, 400V units: 830VDC). |
| OI.AC** (3) AC instantaneous over current trip | Cause: Insufficient ramp times. Phase to phase or phase to earth short-circuit at the Drive output. Remedy: Drive requires autotuning to motor (see parameter 38). Note: These trips cannot be reset for 10 seconds. |
| OI.br** (4) Overcurrent on braking IGBT | Cause: Excessive current in braking resistor. Braking resistor value too small (Does not apply to Size 1 units). Remedy: Check braking resistor values. Note: These trips cannot be reset for 10 seconds. |
| Et (6) External trip | Cause: External trip terminal opened (when programmed). Remedy: Check external circuit connected to trip terminal. |
| O.SP (7) Over speed | Cause: Excessive motor speed (typically caused by the mechanical load driving the motor). Remedy: Check mechanical load conditions. |
| tunE (18) Auto-tune failure | Cause: Motor loaded or no motor connected. Remedy: Ensure motor is connected and free to rotate if necessary. |
| It.br (19) I x t on braking resistor | Cause: Excessive braking resistor energy (Does not apply to Size 1 units). Remedy: Check braking cycles and resistor sizing. |
| It.AC (20) Motor overload on current x time | Cause: Too much mechanical load. Remedy: Reduce mechanical load or check motor sizing. |
| Oht1 (21) Overheat | Cause: Overheat thermal model. Remedy: Check drive ventilation and ambient temperature. |
| Oht2 (22) Overheat (heatsink thermistor) | Cause: Temperature exceeds 95°C (203°F). Remedy: Check heatsink cooling and fans. |
| th (24) Over temperature (Motor thermistor) | Cause: Excessive motor temperature. Remedy: Check motor cooling and load. |
| O.Ld1* (26) +24V or digital output overload | Cause: Excessive load or short circuit on +24V output. Remedy: Check wiring on +24V output. The Enable/Reset terminal will not reset an O.Ld1 trip. Use the Stop/Reset key. |
| cL (28) Current loop loss on terminal 5 | Cause: Input current less than 3mA when 4-20 or 20-4 modes used. Remedy: Check current loop signal source and wiring. |
| SCL (30) User serial communications watchdog failure | Cause: Failure of serial communications between Drive and master. Remedy: Check serial communication cables and master status. |
| EEF (31) Failure of internal EEPROM | Cause: Possible loss of parameter values. Corruption due to severe electrical noise. Remedy: Set default parameters (see parameter 29). |
| PH (32) Phase loss | Cause: One of the input phases has become disconnected from the Drive. (This applies to 200V/400V three phase units only, not dual rated units). Remedy: Check input supply fuses and wiring. |
| rS (33) Stator resistance measurement failure | Cause: Motor cable disconnected during measurement. Motor too small for Drive. Remedy: See parameter 38 for more details. |
| trxx (40-99) User trips | Cause: User trips where xx is the user trip number. Remedy: Check user program or PLC logic generating the trip. |
| F.bus (180) Field bus disconnection | Cause: Field bus disconnection whilst in use. Remedy: Check field bus cables and connections. |
| C.Err (182) Quickey memory corrupt | Cause: Bad connection or memory corrupt. Remedy: Check Quickey insertion or replace Quickey. |
| C.dat (183) Quickey with no data | Cause: New / empty Quickey being read. Remedy: Program Quickey before reading. |
| C.Acc (185) Quickey write fail | Cause: Bad connection or faulty Quickey. Remedy: Re-insert or replace Quickey. |
| C.rtg (186) Quickey voltage rating change | Cause: Already programmed Quickey read by Drive of different rating. Remedy: Use Quickey compatible with drive rating. |
| O.Ld2 (188) +28V serial communications power supply overload | Cause: Overload of more than 110 mA or short circuit on +28V serial communications power supply. Remedy: Check serial comms wiring for shorts or excessive load. |
| O.cL (189) Current loop input overload | Cause: Input current exceeded 25mA. Remedy: Check current source signal level. |
| (No Code) Motor runs unstable | Cause: Motor or motor connections changed. Remedy: Check motor connections. Re-autotune Drive to motor (see parameter 38). |