L&T CX2000 Drive

L&T CX2000 Drive Fault Codes:

Fault Codes	Cause & Solution
OCt Over current	Cause: The inverter turns off its output when the output current of the inverter flows more than the inverter rated current. – The acceleration or deceleration is too fast; – The voltage of the grid is too low; – The power of the VFD is too low; – The load transients or is abnormal; – The grounding is short circuited or the output is phase loss; – There is strong external interference; – The overvoltage stall protection is not open. Solution: – Increase the ACC time; – Check the input power; – Select the VFD with a larger power; – Check if the load is short circuited (the grounding short circuited or the wire short circuited) or the rotation is not smooth; – Check the output configuration; – Check if there is strong interference; – Check the setting of related function codes
OC2 Short circuit	Cause: When IGBT’s Arm is short and output short occurs, the inverter turns off its output. Solution: 1. Disconnect the Motor: Power down the drive and physically disconnect the motor from the output terminals. 2. Check Cables: Inspect the motor cables for any signs of damage, such as fraying, cuts, or kinks. 3. Test with a Multimeter: Use a multimeter to check the resistance between the motor’s phases. A very low or zero resistance reading indicates a short. You can also check the insulation resistance to ground for an earth fault. 4. Run the Drive Without the Motor: If the fault disappears when the motor is disconnected, the problem is in the motor or the cables. 5. Check Internal Components: If the fault persists with the motor disconnected, the issue may be an internal component within the drive itself
GFt Ground fault	Cause: The inverter turns off its output when a ground fault occurs and the ground fault current is more than the internal setting value of the inverter. Solution: 1. Power Down the Drive: Turn off the power to the drive and the equipment it controls. 2. Inspect the Motor: Check the motor for any visible damage to its casing or wiring, and verify that the motor itself is not the source of the fault. 3. Examine Motor Cables: Inspect the entire length of the motor cable, from the drive to the motor, for any signs of insulation damage, cuts, or abrasions. 4. Check Connections: Ensure all connections are secure and free from corrosion or moisture. 5. Verify Cable Length: Confirm that the motor cable does not exceed the maximum specified length for your ABB drive model.
IOL Inverter overload	Cause: The inverter turns off its output when the output current of the inverter flows more than the rated level (150% for 1 minute). Solution: 1. Inspect for Mechanical Problems: Disconnect the motor and check if the motor shaft turns freely. 2. Verify Power Supply and Wiring: Check that the incoming power supply to the drive is correct and stable. 3. Review Drive Parameters: Ensure that the motor parameters in the drive (such as motor FLA, NEMA rating, and control method) are correctly entered and match the actual motor nameplate data. 4. Consider the Motor and Cable: Inspect the motor itself for signs of damage or issues with the windings.
ILt Overload protection	Cause: The inverter turns off its output if the output current of the inverter flows at 150% of the inverter rated current for more than the current limit time (1 min). Solution: 1. Reduce Load: Decrease the load on the motor and see if the fault clears. 2. Inspect Cooling: Check that the VFD’s heatsink is clean and free of obstructions, and that there is adequate airflow to the drive. 3. Examine Motor and Wiring: Look for any physical problems with the motor or loose or damaged motor wiring that could cause a short. 4. Check Drive Settings: Access the drive’s parameters and confirm that the motor overload class (e.g., trip class) is correctly set for the connected motor.
OHt Overheating	Cause: The inverter turns off its output if the heat sink overheats due to a damaged cooling fan or an alien substance in the cooling fan by detecting the temperature of the heat sink. Solution: 1. Clean the heatsink: Remove any accumulated dust or dirt from the drive’s heatsink fins, as this restricts airflow. 2. Verify fan operation: Ensure the drive’s internal fans are running correctly and not failing or running excessively fast. 3. Check for airflow obstructions: Look for any objects blocking the air path around the drive. 4. Assess ambient temperature: High external temperatures can cause the drive to trip, so ensure it is not exposed to excessive heat. 5. Identify motor overload: A motor running with excessive load will generate more heat, leading to the drive’s overheating fault.
POt Output phase loss	Cause & Solution: Phase loss occurred to U, V, W output (or the three phases of motor is asymmetrical). The inverter turns off its output when the one or more of the output (U, V, W) phase is open. The inverter detects the output current to check the phase loss of the output. 1. Motor winding is damaged. Check resistance between motor cables. – Replace motor is winding is damaged. 2. The cable connecting the AC drive and the motor is abnormal. – Check for wiring errors and ensure the output cable is connected properly 3. The AC drive’s three-phase outputs are unbalanced when the motor is running. – Check whether the motor three-phase winding is normal. 4. The drive board or the IGBT is abnormal. – Replace the AC drive.
Out Over voltage	Cause: The inverter turns off its output if the DC voltage of the main circuit increases higher than 400 V when the motor decelerates. This fault can also occur due to a surge voltage generated at the power supply system. Solution: 1. Check Incoming Line Voltage: Measure the supply voltage to the drive to ensure it is within the drive’s nominal range. 2. Verify Overvoltage Control: Check the drive’s parameters to confirm that the overvoltage control feature is enabled. 3. Adjust Deceleration Time: Increase the deceleration time parameter (e.g., parameter 2203 ACCELER TIME 1) in the drive’s settings to provide more time for the DC bus to bleed off excess energy. 4. Inspect Braking System: If your application requires very fast deceleration, check that the brake chopper and resistors are functioning correctly and have sufficient capacity
Lut Low voltage	Cause: The inverter turns off its output if the DC voltage is below 180V because insufficient torque or overheating of the motor can occur when the input voltage of the inverter drops. Solution: 1. Missing Phase(s): One or more phases of the input power are lost, which directly leads to low voltage on the DC link. 2. Blown Fuse: A fuse related to the input power supply may have blown, cutting off power. 3. Undervoltage on Mains: The main power supply itself is experiencing a lower voltage than what the drive requires to operate correctly. 4. Damaged Components: An internal or external component, such as an encoder, could be malfunctioning and causing a voltage drop.
EtH Electronic thermal protection	Cause: The internal electronic thermal of the inverter determines the overheating of the motor. If the motor is overloaded the inverter turns off the output. The inverter cannot protect the motor when driving a motor having more than 4 poles or multi motors. Solution: 1. Check Cooling: Inspect the drive’s cooling fans to ensure they are functioning correctly and that the heat sinks are free of dust or debris. 2. Verify Ventilation: Ensure there is adequate airflow around the drive’s mounting location and that it is not enclosed in a way that restricts cooling. 3. Check the Load: Verify that the motor and the application load are within the drive’s rated capacity. 4. Reduce Duty Cycle: If the application requires frequent starting and stopping, or heavy acceleration/deceleration, consider reducing the frequency of operation to prevent overheating. 5. Inspect Sensors and Components: If the problem persists, the internal thermal sensors or fans may need replacement.
COL Input phase loss	Cause: Inverter output is blocked when one of R, S, T is open or the electrolytic capacitor needs to be replaced. Solution: 1. Three phase input is abnormal. – Eliminate faults in external circuitry 2. Drive board is abnormal. – Eliminate faults in external circuitry 3. Lightning protection board is abnormal. – There is an hardware or software issue in drive. Need to repair or replace drive. 4. Control board is abnormal. – There is an hardware or software issue in drive. Need to repair or replace drive.
EEP Parameter save Abnormity	Cause: It occurs when the parameters changed by user fail to be saved in the internal inverter and the power is applied.
HUT Hardware Abnormity	Cause: It occurs when the software is abnormal. If the faults can not be cleared by STOP/RESET key or reset terminal on the panel. The input power supply of the inverter is cut off and the power is not applied again until the panel power disappears completely.
IE7 Panel communication abnormity	Cause: When the communication between inverter and panel are abnormal, If the faults can not be cleared by STOP/RESET key or reset terminal on the panel. – The input power supply of the inverter is cut off and the power is not applied until the panel power disappears completely.
COA Panel abnormity	Cause: It occurs when the inverter panel is abnormal, which lasts a certa in of time.
FAn Cool fan abnormity	Cause: It occurs when the cool fan of the inverter is abnormal. The cool fan can run consecutively or stop. Solution: 1. Check Fan Operation and Connection: isually inspect the fan for any obstructions or debris that might be preventing it from spinning. – Ensure the fan is securely connected to the drive. 2. Test Fan Voltage: If the fan appears connected and clear, check if the correct voltage is being supplied to it. 3. Inspect Fan for Damage: If the voltage is correct but the fan isn’t running, the fan itself is likely faulty and needs to be replaced. 4. Clean Heat Sinks: Overheating issues can be a cause of fan faults, so ensure the drive’s heat sinks are clean to allow proper airflow
ESt Emergency stop	Cause: When the emergency stop (EST) terminal closes, the inverter out put is turned off. Solution: 1. Confirm it’s Released: Ensure the emergency stop button is not pressed or stuck in the “activated” position. 2. Inspect the Button: Look for any physical damage or a button that may be jammed. 3. Verify Safety Input Wiring: Check the wiring from the emergency stop button to the drive’s safety input terminals for proper connection and continuity. 4. Parameter Settings: Use the drive’s control panel or compatible software to verify that the safety inputs are correctly set up in the parameters
EtA Contract A Fault signal	Cause: As for the function (117-121) of the multi-function output terminal of group I/O, when the terminal set with 18 (external fault signal input: contact A) closes, the inverter output is turned off. Solution: Remove the abnormity of the loop connected on the external fault terminal and check the causes for external faults.
Etb Contract B Fault signal	Cause: As for the function (117-121) of the multi-function output terminal of group I/O, when the terminal set with 19 (external fault signal input: contact B) closes, the inverter output is turned off. Solution: Remove the abnormity of the loop connected on the external fault terminal and check the causes for external faults.
__L Frequency command loss	Cause: As for the abnormity of the frequency command, when the inverter runs through analog input (0ᨺ10V or 0ᨺ20V) or RS-485 communications, the signals can not be input, while, the operation method set is chosen according to operation method when the speed command is lost. Solution: Check the connection wiring of AIN terminal and command grade.
ntC NTC disconnection	Cause: The output is turned off when NTC is disconnected. Solution: 1. Physically inspect the NTC thermistor and its wiring for any signs of disconnection, damage, or loose connections. 2. Ensure the thermistor is installed correctly and in the proper location for monitoring temperature.
nbr Brake control abnormity	Cause: When the brake control is used, the output current is lower than the rated current value of the motor set (I82) and lasts for over 10s, then the inverter output is turned off and the brake is not opened. Solution: Check the capacity and wiring of motor.
SAFA Safe stop Terminal A disconnection	Cause: If safe stop is required, cut off panel SA and SC and turn off the inverter output.
SAFA Safe stop Terminal B disconnection	Cause: If safe stop is required, cut off panel SA and SC and turn off the inverter output.