Delta VFD-L Fault codes
Hi everyone,
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.
oc: over current
These steps are a good starting point to troubleshoot an "overcurrent" fault in an AC drive. Here is a more detailed explanation of each step:
Check the motor horsepower: The AC drive should be able to handle the power requirements of the motor. If the motor horsepower exceeds the AC drive's output power, it can result in an overcurrent fault.
Check the wiring connections: Check the wiring connections between the AC drive and motor for any signs of a short circuit. If a short circuit is detected, disconnect power to the AC drive and repair the wiring.
- Increase the acceleration time: The acceleration time can be increased by adjusting parameters Pr.1-09 and Pr.1-11. This will give the motor more time to reach its full speed and reduce the stress on the AC drive.
- Check for excessive loading conditions: Excessive loading conditions can result in an overcurrent fault. Check for any possible sources of excessive loading and remove them if possible.
- Send the AC drive back to the manufacturer: If there are still abnormal conditions after the short circuit is removed, it is recommended to send the AC drive back to the manufacturer for repair.
+ It is important to remember that safety should always be a priority when troubleshooting electrical equipment. If you are unsure about any steps, it is recommended to seek assistance from a qualified electrician or the manufacturer.
ov (ou): Overvoltage:
These steps can help you troubleshoot an "overvoltage" fault in an AC drive:
- Check the input voltage: Make sure that the input voltage falls within the rated AC drive input voltage. If the voltage is too high, it can result in an overvoltage fault.
- Check for voltage transients: Voltage transients can cause temporary spikes in the DC bus voltage, resulting in an overvoltage fault. Check for any possible sources of voltage transients and remove them if possible.
- Increase the deceleration time: Motor regeneration can cause an overvoltage fault in the AC drive. Increasing the deceleration time can help to reduce the stress on the AC drive during motor regeneration.
- Check for excessive loading conditions: Excessive loading conditions can also result in an overvoltage fault. Check for any possible sources of excessive loading and remove them if possible.
- Send the AC drive back to the manufacturer: If there are still abnormal conditions after the overvoltage is removed, it is recommended to send the AC drive back to the manufacturer for repair.
+ As with all electrical equipment, it is important to follow proper safety procedures and seek assistance from a qualified electrician or the manufacturer if needed.
oh: Overheat
These steps can help you troubleshoot an overheating issue in an AC drive:
- Check the ambient temperature: Ensure that the ambient temperature falls within the specified temperature range for the AC drive. If the temperature is too high, it can result in overheating.
- Clear ventilation holes: Make sure that the ventilation holes on the AC drive are not obstructed, as this can prevent proper air flow and result in overheating.
- Clean the heat sink: Remove any foreign objects on the heat sink and check for any dirty heat-sink fins, which can prevent proper heat dissipation and result in overheating.
- Provide adequate spacing: Make sure that there is enough spacing around the AC drive for adequate ventilation. If the AC drive is too close to other equipment or walls, it can result in overheating.
- Check for sources of heat generation: Check for any other sources of heat generation within the AC drive, such as failed components, and remove them if possible.
- Repair or replace the AC drive: If the excessive heat persists after following these steps, the AC drive may need to be repaired or replaced.
+ Remember to always follow proper safety procedures when working with electrical equipment, and seek assistance from a qualified electrician or the manufacturer if needed.
Lu: Low Voltage.
These steps can help you troubleshoot a "low voltage" fault in an AC drive:
- Check the input voltage: Make sure that the input voltage falls within the rated AC drive input voltage. If the voltage is too low, it can result in a low voltage fault.
- Check the wiring connections: Check the wiring connections between the AC drive and the power source for any loose connections, which can result in a low voltage fault.
- Decrease the deceleration time: Decreasing the deceleration time can help to reduce the stress on the AC drive during motor regeneration, which can result in a low voltage fault.
- Check for excessive loading conditions: Excessive loading conditions can also result in a low voltage fault. Check for any possible sources of excessive loading and remove them if possible.
- Send the AC drive back to the manufacturer: If there are still abnormal conditions after the low voltage is removed, it is recommended to send the AC drive back to the manufacturer for repair.
- As with all electrical equipment, it is important to follow proper safety procedures and seek assistance from a qualified electrician or the manufacturer if needed.
- Check the wiring connections between the AC drive and the power source for possible loose connections.
Decrease the deceleration time (Pr.2-08, Pr.2-10).
- Check for possible excessive loading conditions at the motor.
If there are any abnormal conditions when operating the AC drive after the low voltage is removed, the drive should be sent back to manufacturer for repair.
oL: Overload.
The message "ol: The AC drive detects excessive drive output current" is indicating that the AC drive has detected an excessive current being drawn from the output. This can cause issues with the operation and control of the motor, and can potentially damage the drive or other components in the system.
To resolve the issue, you can try the following steps:
- Check whether the motor is overloaded: Verify that the motor is not being overloaded, which can cause excessive current to be drawn from the drive.
- Reduce torque compensation setting: Decrease the torque compensation setting in Pr.7-02. This can reduce the current being drawn from the drive and resolve the issue.
- Increase the AC drive's output capacity: If the issue persists, you may need to increase the AC drive's output capacity by replacing it with a drive that has a higher output capacity.
- It is important to resolve the over-current issue to prevent damage to the drive and other components in the system. Please note that the AC drive can withstand up to 150% of the rated current for a maximum of 60 seconds, so it is important to take action to resolve the issue as soon as possible.
oL1: Overload
These steps can help you troubleshoot an "internal electronic overload trip" fault in an AC drive:
Check for motor overload: The internal electronic overload trip fault can be caused by a motor overload, so it is important to check for any excessive loads on the motor and remove them if possible.
- Check the thermal overload setting: Make sure that the electronic thermal overload setting on the AC drive is set correctly. If the setting is too low, it can result in an internal electronic overload trip.
- Increase the motor capacity: If the motor is underpowered, increasing its capacity can help to prevent an internal electronic overload trip.
- Reduce the current level: Make sure that the current level at the drive output does not exceed the value set by the Motor Rated Current parameter (Pr.7-00). If the current level is too high, it can result in an internal electronic overload trip.
- Check the wiring connections: Check the wiring connections between the AC drive and motor for any loose connections, which can result in an internal electronic overload trip.
- Check for external factors: Check for any possible overloading caused by external factors, such as excessive loading conditions or high ambient temperatures.
- Repair or replace the AC drive: If the issue persists after following these steps, the AC drive may need to be repaired or replaced.
As with all electrical equipment, it is important to follow proper safety procedures and seek assistance from a qualified electrician or the manufacturer if needed.
- 5. Check the wiring connections between the AC drive and motor for any loose connections.
Check for any possible overloading caused by external factors, such as excessive loading conditions or high ambient temperatures.
If the issue persists, the AC drive may need to be repaired or replaced.
eF: External fault (digital)
The statement "When external terminal EF-GND is closed, the output will be turned off" refers to a Normally Open (N.O.) External Field (EF) switch. When the switch is in the "ON" state, it provides a connection between the EF-GND terminal and ground, which in turn turns off the output. When the switch is in the "OFF" state, the output is on because there is no connection between the EF-GND terminal and ground.
In other words, the output state is dependent on the state of the EF-GND switch. If the switch is closed, the output is turned off. If the switch is open, the output is turned on.
oL2: Overload
The message "oL2: Motor overload. Check the parameter settings (Pr.6-03 to Pr.6-05)" is indicating that the motor has tripped due to an overload condition and the user should check the parameters related to over-torque protection.
The steps to resolve the issue are:
Reduce the motor load: If the motor is overloading because there is too much weight or resistance on it, you can reduce the load to prevent it from tripping again.
Adjust the over-torque detection setting: The parameters Pr.6-03 to Pr.6-05 are related to the over-torque protection setting. You can adjust these parameters to a more appropriate setting based on the requirements of the motor and the load it is carrying. For example, if the over-torque protection setting is too sensitive, you can increase it so that the motor is less likely to trip in the future.
It is important to make these changes carefully, as improper settings can cause the motor to trip repeatedly or lead to damage to the motor or other equipment.
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