In case of a fault, it is important to troubleshoot the problem in order to prevent damage to the Delta VFD-L AC drive and the connected equipment. To do so, you can follow these steps:

Identify the fault: Check the digital keypad display for the six most recent faults.

Check for external factors: Make sure that there is no power failure, overvoltage, or overcurrent that might be causing the fault.

Review the fault description: Refer to the fault information in the Delta VFD-L  AC drive manual to understand the cause of the fault.

Check the wiring: Make sure that the wiring is correct and there are no loose connections.

Check the parameters: Ensure that the parameters are set correctly for the application.

Check the load: Make sure that the load is within the rated capacity of the AC drive.

Perform a reset: Try resetting the AC drive by pressing the Reset key on the keypad or Input Terminal.

If the problem persists after following these steps, it is recommended to seek technical support from the manufacturer.

It is important to note that some faults can be dangerous and can cause harm to the equipment and/or personnel. It is recommended to take appropriate precautions and seek technical support if unsure about troubleshooting the fault.

oCA:
The message "oCA: Over-current during acceleration" is indicating that the drive experienced an over-current condition during acceleration. This can be caused by several factors, including:

Short-circuit at the motor output: If there is a short-circuit at the motor output, it can cause an over-current condition.

Torque boost too high: The torque boost setting (Pr.7-02) determines the amount of additional torque provided during acceleration. If this setting is too high, it can cause an over-current condition.

Acceleration time too short: If the acceleration time is set too short, it can cause an over-current condition.

AC drive output capacity is too small: If the AC drive has an output capacity that is too small, it can cause an over-current condition.

To resolve the issue, you can try the following steps:

Check for possible poor insulation at the output line: Insulation problems at the output line can cause over-current conditions. Check the insulation and replace any damaged parts.

Decrease the torque boost setting: If the torque boost setting is too high, decrease it to a more appropriate value.

Increase the acceleration time: If the acceleration time is too short, increase it to a more appropriate value.

Replace with an AC drive with higher output capacity: If the AC drive has an output capacity that is too small, you can replace it with a larger drive.

It is important to troubleshoot and resolve the issue carefully to prevent further damage to the drive and other components in the system.

ocd:
The message "ocd: Over-current during deceleration" is indicating that the drive experienced an over-current condition during deceleration. This can be caused by several factors, including:

Short-circuit at the motor output: If there is a short-circuit at the motor output, it can cause an over-current condition.

Deceleration time too short: If the deceleration time is set too short, it can cause an over-current condition.

AC drive output capacity is too small: If the AC drive has an output capacity that is too small, it can cause an over-current condition.

To resolve the issue, you can try the following steps:

Check for possible poor insulation at the output line: Insulation problems at the output line can cause over-current conditions. Check the insulation and replace any damaged parts.

Increase the deceleration time: If the deceleration time is too short, increase it to a more appropriate value.

Replace with an AC drive with higher output capacity: If the AC drive has an output capacity that is too small, you can replace it with a larger drive.

It is important to troubleshoot and resolve the issue carefully to prevent further damage to the drive and other components in the system.

bb:
The message "bb: External Base Block" is indicating that the AC drive output has been turned off due to an external input signal to the terminal "B.B".

The external input signal to the terminal "B.B" is likely coming from an external device such as a switch, relay, or PLC. This input is used to turn off the AC drive output in certain situations, such as emergency stop or maintenance shutdown.

To resolve the issue, you can try the following steps:

Disable the connection: Disconnect the external input signal from the terminal "B.B" and the AC drive should start working again.

Verify the external input signal: Check the external device that is sending the signal to the terminal "B.B" to verify that it is functioning properly and sending the correct signal.

It is important to make sure that the AC drive is safely restarted after resolving the issue.

ocn:
The message "ocn: Over-current during steady state operation" is indicating that the drive experienced an over-current condition during normal operation. This can be caused by several factors, including:

Short-circuit at the motor output: If there is a short-circuit at the motor output, it can cause an over-current condition.

Sudden increase in motor loading: If there is a sudden increase in the motor load, it can cause an over-current condition.

AC drive output capacity is too small: If the AC drive has an output capacity that is too small, it can cause an over-current condition.

To resolve the issue, you can try the following steps:

Check for possible poor insulation at the output line: Insulation problems at the output line can cause over-current conditions. Check the insulation and replace any damaged parts.

Check for possible motor stall: If the motor stalls, it can cause an over-current condition. Check the motor and resolve any issues that are causing the stall.

Replace with the AC drive with one that has a higher output capacity: If the AC drive has an output capacity that is too small, you can replace it with a larger drive.

It is important to troubleshoot and resolve the issue carefully to prevent further damage to the drive and other components in the system.

cE1:
The message "CE1: Communication Error" is indicating that there is a problem with the communication between the AC drive and the computer or other external device. This can cause issues with the operation and control of the AC drive.

To resolve the issue, you can try the following steps:

Check the connection: Verify that all the wires are properly connected and tightened between the AC drive and the computer.

Check the communication protocol: Make sure that the communication protocol between the AC drive and the computer is properly set. This includes checking the baud rate, parity, and data bits, as well as any other communication parameters that are specific to your setup.

It is important to resolve the communication error to ensure that the AC drive can operate properly and that the data being transmitted between the AC drive and the computer is accurate and reliable.

+ Delta VFD-L User Manuals

+ Delta VFD-L Fault codes 

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