Disclaimer: Always consult the official Festo CMMO-ST User Manual (Document ID: 8063446 or similar) for your specific firmware version for the definitive error code list.
Keep this guide printed inside your control cabinet door. When those LEDs start blinking, you’ll know exactly what action to take.
When the turns Red, follow this standard procedure:
and the drive jerks, a power stage failure could be the cause, indicating the unit might need replacement. cmmo-st-c5-1-diop error codes
| Error Code | Name | Description | Immediate Action | | :--- | :--- | :--- | :--- | | | Under-voltage | DC link voltage < 18 V DC (nominal 24 V) | Check power supply capacity; measure at X1 terminals. | | 0x1200 | Over-voltage | DC link voltage > 32 V DC (regenerative braking issue) | Add external braking resistor; decelerate ramp longer. | | 0x1300 | Short Circuit | Phase-to-phase or phase-to-ground short in motor cable | Disconnect motor; test windings for resistance (<1 ohm indicates short). | | 0x1400 | Over-current | Instantaneous peak current > 5 A (software limit) | Reduce acceleration (object 0x6083h) or torque limit. |
Don’t assume “CMMO-ST-C5-1-DIOP” is the primary controller. In some chillers, it’s only an . The main error codes may be displayed on a different panel (e.g., a Carel or Danfoss controller). Trace the comms cable – you might find the real brain of the system.
| Error Code | Name | Description | Immediate Action | | :--- | :--- | :--- | :--- | | | Driver Overtemp | Internal heat sink > 85°C | Improve airflow; reduce duty cycle; check ambient temperature. | | 0x2200 | Motor I²t Overload | RMS current limit exceeded (object 0x2030h) | Increase cycle time; reduce load inertia; enable standstill current reduction. | | 0x2300 | Sensor Temperature | NTC sensor on PCB reports > 90°C | Clean ventilation slots; verify mounting orientation (vertical recommended). | Disclaimer: Always consult the official Festo CMMO-ST User
While the full list contains over 100 entries, these specific codes are commonly reported by users: Error Code (Hex) Description Likely Cause Undervoltage Load supply voltage is below the required 24V threshold. Following Error
Overvoltage in the logic power supply. The 24V DC input exceeds acceptable tolerances (+15%).
These faults signal unstable power distribution or physical board damage. When the turns Red, follow this standard procedure:
Excessive current detected in the motor windings, or the controller's internal electronics are too hot. Troubleshooting:
Perform a "Reinitialize Device" or reload the configuration parameters. Detailed Troubleshooting Steps for CMMO-ST If the error persists, follow this systematic approach:
To reduce the frequency of these errors, implement a monthly checklist for the CMMO-ST-C5-1-DIOP:
Errors range from recoverable warnings (e.g., temperature threshold alerts) to fatal faults (e.g., short circuits requiring power cycling).
Lower priority than errors. Warnings do not require acknowledgment and disappear once the cause is resolved. HHHH