The Delta VFD-B AC motor drive's comprehensive fault diagnostic system is designed to detect faults and activate protective functions to prevent further damage to the system. The digital keypad display is used to display the four most recent faults, which can be read from the keypad or through communication. It's important to wait 5 seconds after a fault has been cleared before performing a reset via the keypad or input terminal to give the system time to stabilize.

There are three methods to reset the Delta VFD-B AC motor drive after solving a fault:

    Pressing the RESET/STOP key on PU01: This method involves physically pressing the RESET/STOP key on the control panel to reset the system.

    Setting an external terminal to "RESET": This method involves setting one of the Pr.04-04 to Pr.04-09 parameters to the value of 05,

EF: External Fault
- Check the external input wiring for proper connections and for any possible short circuits.
- Ensure that the external input is not being activated by an external device.
- Ensure that the external fault input is not being activated by a ground fault or a fault in the external circuit.
- Check for proper setting of the external fault input function in Pr.06-20.

EF1: Emergency stop
    Check for any malfunctions in the emergency stop system, including the buttons, switches, and wiring.
    Ensure that the emergency stop input terminals are properly connected and configured.
    Make sure that the emergency stop signal is properly functioning and not triggering erroneously.

PcodE: Password is locked.
This error message indicates that the password protection feature on the AC motor drive has been activated, and the keypad is now locked. To resolve this issue, turn off the power to the AC motor drive and then turn it back on. You will then need to enter the correct password in order to regain access to the keypad and continue using the drive. You can find the password protection settings in the parameters Pr.00-07 and Pr.00-08.

cFA: Auto accel/decel failure
Check the settings of the acceleration time and deceleration time in Pr.7-01 and Pr.7-02.

- Check the motor wiring and connection.
- Check the drive output power and consider replacing the AC motor drive with a higher power model if needed.

GFF: Ground fault
- Check if the output terminal is connected to ground, and disconnect it if necessary.
- Check for any loose or broken wires in the motor wiring.
- Check for any mechanical issues with the motor that may cause it to touch ground.
- Inspect the AC motor drive for any visible damage or signs of overheating.
- If the problem persists, consider seeking  professional help or replacing the AC motor drive if necessary.

bb: External Base Block.

- Check if the external input terminal (B.B) is connected to the correct source and wired properly.
- Make sure that the setting in Pr. 08-06 is configured correctly to match the wiring.

AnLer: Analog feedback error or ACI open circuit

    Check for open circuit or short circuit in the analog feedback circuit. (P10.00)
    Replace the damaged component in the analog feedback circuit if necessary.
    Ensure that the analog feedback signal is within the specified range (Pr.10-05).

PGErr:  PG feedback signal error
- Check the output voltage of the PG card and make sure it is within the acceptable range. (Pr.10-10 and Pr.10-11)
- Check for any potential issues with the PG sensor such as damage or improper installation.

AUE: Auto Tuning Error
The error message "AUE: Auto Tuning Error" in a control system typically indicates a problem with the tuning of the system's automatic control loop. To resolve the issue, the two steps you listed (checking the cabling between the drive and motor and checking Pr.07-05) are good places to start.

    Checking the cabling between the drive and motor: This step is important because the AUE error could be caused by a problem with the communication between the drive and the motor, such as a disconnected cable or a broken wire. You should inspect the cabling and ensure that all connections are secure and free of damage.

    Checking Pr.07-05: Pr.07-05 is a parameter in the control system that is used to adjust the settings for the automatic control loop. The exact meaning of this parameter will depend on the specific control system you are using, but in general, it may control the responsiveness of the loop or set the tolerance for deviations from the setpoint. If the value of Pr.07-05 is incorrect, it can cause the AUE error, so it's a good idea to check this parameter to see if it needs to be adjusted.

If these steps do not resolve the issue, you may need to consult the manufacturer's manual or contact technical support for further assistance.

cEF:  The error message "cEF: EF when preliminary count value attained" in a control system typically indicates a problem with the counter function of the system. To resolve the issue, the two steps you listed (checking the counter trigger signal and checking Pr.03-09 and Pr.03-11 setting) are good places to start.

    Checking the counter trigger signal: This step is important because the cEF error could be caused by a problem with the trigger signal that starts the counting process. You should inspect the trigger signal and ensure that it is functioning properly and that the appropriate connections are made.

    Checking Pr.03-09 and Pr.03-11 setting: Pr.03-09 and Pr.03-11 are parameters in the control system that are used to adjust the settings for the counter function. The exact meaning of these parameters will depend on the specific control system you are using, but in general, they may control the trigger signal, the counting direction, or the preliminary count value. If the values of Pr.03-09 and Pr.03-11 are incorrect, it can cause the cEF error, so it's a good idea to check these parameters to see if they need to be adjusted.

LC: Under Current
The error message "LC: Under Current" in a control system typically indicates that the system is detecting a lower than expected current flow in the load. To resolve the issue, the two steps you listed (checking the load current and checking Pr.06-12 to Pr.06-15 setting) are good places to start.

    Checking the load current: This step is important because the LC error could be caused by a problem with the load itself, such as a fault in the equipment or a reduction in the current flow. You should measure the current flow in the load and compare it to the expected value to see if there is a discrepancy.

    Checking Pr.06-12 to Pr.06-15 setting: Pr.06-12 to Pr.06-15 are parameters in the control system that are used to adjust the settings for the current detection function. The exact meaning of these parameters will depend on the specific control system you are using, but in general, they may control the current threshold or the response time for detecting a change in current. If the values of Pr.06-12 to Pr.06-15 are incorrect, it can cause the LC error, so it's a good idea to check these parameters to see if they need to be adjusted.

PHL: Phase Loss
The error message "PHL: Phase Loss" in a control system typically indicates that the system has detected a loss of one of the phases in the input power supply. This can cause the system to stop operating or function improperly.

To resolve the issue, the recommended step of checking the input phase wiring for loose contacts is a good place to start. Loose or disconnected contacts can cause a phase loss, so it's important to inspect the wiring and ensure that all connections are secure. You should also check the input power source to see if it is providing the correct voltage and frequency.

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