Drive Fault Codes and Descriptions

UU (DC Bus Under Voltage):
       Description: This fault occurs when the DC bus voltage falls below a minimum threshold, which can destabilize the drive.
Low AC supply voltage: If the incoming AC power is unstable or too low, it can result in insufficient DC bus voltage.
Low DC bus voltage from an external supply: When using an external DC power source, if that source isn't providing adequate voltage, the DC bus may not maintain the required level. This might happen if the external power supply is faulty or overloaded.
       Solutions: Check the incoming AC supply voltage or the health of the external DC power source. Ensure all connections are secure and that the power source is capable of supplying the necessary voltage.

OV (DC Bus Over Voltage):
       Description: This fault occurs when the DC bus voltage exceeds the drive’s maximum allowable limit, potentially damaging the drive.
Deceleration rate too fast: If the drive decelerates a high-inertia load too quickly, the regenerative energy can cause the DC bus voltage to spike.
Mechanical load driving the motor: If an external mechanical force drives the motor beyond its set speed, it can generate excess energy that flows back into the DC bus, causing an overvoltage condition.
       Solutions: Adjust the deceleration rate in the drive's settings to allow more time for the load to decelerate. Check the mechanical system for any issues that might cause the motor to be driven externally.

OI.AC (Drive Output Instantaneous Overcurrent):
       Description: This fault is triggered when the drive detects an immediate and excessive current surge, which could indicate a serious issue in the motor or wiring.
Insufficient ramp times: If the drive ramps up or down too quickly, it can cause high inrush currents that exceed the drive’s capacity.
Phase-to-phase or phase-to-ground short circuit: This is a critical fault where the wiring may be damaged or shorted, causing a direct surge of current.
Autotuning required: The drive might not be optimally tuned to the motor, causing mismatched performance and potential overcurrent. Autotuning adjusts the drive’s parameters to match the motor’s characteristics.
Motor or connection changes: If the motor or its connections have been altered, the drive may need to be re-tuned to adapt to the new conditions.
       Solutions: Perform a thorough check of the motor wiring for shorts or other issues. Consider increasing the ramp times in the drive's configuration. If the motor or connections have been changed, run the drive’s autotuning function again.

OI.br (Braking Resistor Instantaneous Overcurrent):
       Description: This fault occurs when the current through the braking resistor exceeds safe levels, which can damage the resistor or the drive.
Excessive braking current: This might happen if the load requires more braking power than the resistor can safely handle.
Undersized braking resistor: If the braking resistor isn't rated for the application, it may not be able to dissipate the energy effectively, leading to an overcurrent condition.
       Solutions: Ensure the braking resistor is correctly sized for the application. Consider using a resistor with a higher power rating if the load demands more braking energy.

O.SPd (Over Speed):
       Description: The drive detects that the motor is running at a speed higher than its set limits, which can be dangerous for the system.
Excessive motor speed due to external forces: This typically happens if the motor is being driven by an external mechanical load, which pushes it beyond the set speed.
       Solutions: Check the mechanical setup to ensure there’s no external force driving the motor unexpectedly. Adjust the speed limits in the drive’s settings if necessary.

tunE (Auto Tune Stopped Before Completion):
       Description: The drive’s autotuning process was interrupted before it could finish, meaning the drive parameters may not be properly set.
Run command removed too early: If the drive’s run command was stopped during autotuning, the process didn’t complete.
       Solutions: Restart the autotuning process and ensure it completes before stopping the drive.

It.br (I²t on Braking Resistor):
       Description: This fault indicates that the braking resistor has absorbed too much energy over time, potentially overheating.
Excessive braking resistor energy: The resistor may be undersized for the braking demands of the application.
       Solutions: Review the braking cycles and consider upgrading the resistor to handle higher energy dissipation.

It.AC (I²t on Drive Output Current):
       Description: The drive has detected that the current over time (I²t) has exceeded safe limits, which might indicate a prolonged overload condition.
Excessive mechanical load: The motor may be trying to drive a load that is too heavy or requires more torque than it can safely provide.
High impedance short circuit: A phase-to-phase or phase-to-ground short with high impedance can also cause this issue.
Drive requires re-autotuning: The drive may not be optimally tuned to the motor, requiring a fresh autotuning process.
       Solutions: Check the mechanical load to ensure it’s within the motor’s capability. Inspect the wiring for potential shorts. If needed, re-run the autotuning process.

O.ht1 (IGBT Overheat Based on Drive's Thermal Model):
       Description: The drive has calculated, based on its internal thermal model, that the IGBT modules are overheating.
Overheating due to prolonged high load or poor cooling: If the drive is continuously running under high loads or if cooling is inadequate, the internal temperature can rise to unsafe levels.
       Solutions: Improve cooling around the drive, ensure proper ventilation, and consider reducing the load if possible.

O.ht2 (Overheat Based on Drive's Heatsink):
       Description: The temperature of the drive’s heatsink has exceeded the allowable maximum, which could damage the drive.
Inadequate cooling: Blocked airflow or high ambient temperatures can cause the heatsink to overheat.
       Solutions: Ensure that the drive’s cooling system is functioning properly. Clean any dust or obstructions from the heatsink and ensure the surrounding environment is within the drive’s specified operating temperature range.

th (Motor Thermistor Trip):
       Description: The motor's internal thermistor has detected an excessive temperature, which could damage the motor.
Overheating: This may be due to inadequate motor cooling, excessive load, or long periods of high current operation.
       Solutions: Check the motor’s cooling system, reduce the load if necessary, and ensure that the motor is operating within its specified temperature range.

O.Ld1 (User +24V or Digital Output Overload):
       Description: The drive has detected an overload or short circuit condition on the +24V output or digital output.
Excessive load or short circuit: This can happen if too many devices are drawing power from the +24V output or if there’s a wiring fault.
       Solutions: Reduce the load on the +24V output or check for wiring issues. Reset the drive using the Stop/Reset button, as this fault cannot be reset via the Enable/Reset terminal.

cL1 (Analog Input 1 Current Mode, Current Loss):
       Description: The current loop input on terminal 5 has fallen below the required threshold, which can disrupt the drive’s operation.
Input current less than 3mA: In 4-20mA or 20-4mA modes, if the input current drops too low, it indicates a possible break in the current loop or a failure in the current source.
       Solutions: Inspect the current loop wiring for breaks or disconnections, and ensure the current source is functioning properly.

SCL (Serial Communications Loss Timeout):
       Description: The drive has lost communication with the remote controller, which could disrupt operation if the drive is under remote control.
Communication loss: This could be due to cable disconnection, interference, or incorrect communication settings.
       Solutions: Check all serial communication connections, ensure proper grounding, and verify that the communication parameters are correctly set.

EEF (Internal Drive EEPROM Failure):
       Description: The EEPROM, which stores the drive’s parameter settings, has encountered an error, potentially leading to loss of settings.
Electrical noise or hardware failure: This can corrupt the stored parameters or cause them to be lost.
       Solutions: Reset the drive to its default parameters (refer to parameter 29 in the manual) and ensure the drive’s installation environment is free from excessive electrical noise.

PH (Input Phase Imbalance or Input Phase Loss):
       Description: The drive has detected a phase imbalance or loss of one of the input phases, which can cause instability.
Disconnected input phase: This applies only to 200/400V three-phase drives and indicates one of the input phases has become disconnected or is out of balance.
       Solutions: Check the input power supply and wiring for any disconnections or blown fuses. Restore proper phase balance.

rS (Failure to Measure Motor’s Stator Resistance):
       Description: The drive failed to measure the motor’s stator resistance, which is necessary for certain drive functions.
Motor too small or cable disconnected: If the motor is too small for the drive or if the motor cables are disconnected during measurement, this fault will occur.
       Solutions: Ensure the motor connections are secure and retry the measurement. For very small motors, ensure they are suitable for the drive's capabilities.

C.Err (SmartStick Data Error):
       Description: The drive detected an error with the data on the SmartStick, a device used for data storage and transfer.
Bad connection or memory corruption: There may be a loose connection or actual corruption of the SmartStick’s memory.
       Solutions: Check the SmartStick connections, secure them properly, and replace the SmartStick if necessary.

C.dAt (SmartStick Data Does Not Exist):
       Description: The SmartStick being read is either new or has no data stored on it.
New or uninitialized SmartStick: The SmartStick has not been used or initialized yet.
       Solutions: Initialize or configure the SmartStick as needed before use.

C.Acc (SmartStick Read/Write Fail):
       Description: The drive is unable to read or write data to the SmartStick.
Bad connection or faulty SmartStick: There might be a connection issue or the SmartStick itself could be faulty.
       Solutions: Ensure all connections are secure. If the problem persists, replace the SmartStick.

C.rtg (SmartStick/Drive Rating Change):
       Description: The SmartStick read by the drive has a different voltage rating than what the drive expects.
Incompatible SmartStick: A SmartStick that was programmed for a different drive rating is being used.
       Solutions: Verify that the SmartStick is compatible with the drive’s voltage rating before use.

O.cL (Overload on Current Loop Input):
       Description: The input current on the current loop has exceeded safe levels, potentially causing damage.
Input current exceeds 25mA: This indicates a possible issue with the current source or a fault in the loop configuration.
       Solutions: Check all loop parameters and ensure the current source is set correctly and within safe limits.

HFxx Trip (Hardware Faults):
       Description: This indicates a general hardware fault within the drive, which could be due to internal component failures.
Internal drive faults: These could be due to failing components, such as capacitors or IGBTs, or faults in the drive's internal circuitry.
       Solutions: A hardware fault usually requires professional servicing. If this fault occurs, consider shutting down the drive and contacting the manufacturer or a service professional.