Delta VFD-F Fault codes
Hello! Welcome to Maintenance and Inspections of your Delta VFD-F.
Maintenance Basics
Your modern AC drive is a solid piece of tech, but it does need some regular care to keep it running smoothly and to ensure it lasts a long time. It's a good idea to have a qualified technician check it out every month.
Before any check-up, remember to turn off the AC Input Power and wait about 10 minutes until all the lights are off. Then, use a multimeter to make sure the capacitors have fully discharged by checking the voltage between B1 and Ground.
Periodic Inspection
Here's what to look out for during operation:
Check if the motors are working as they should.
Make sure the installation environment is all good.
See if the cooling system is doing its job.
Listen for any weird vibrations or sounds.
Keep an eye on the motors to make sure they're not getting too hot.
Always use a voltmeter to check the input voltage of the AC drive.
Periodic Maintenance
Warning! Always disconnect AC power before doing any maintenance!
Tighten any loose screws on the AC drive, as they can come loose due to vibration or temperature changes.
Check if any conductors or insulators are corroded or damaged.
Use a Meg-ohmmeter to check the insulation resistance.
Regularly check and replace capacitors and relays.
If you're not using the AC drive for a long time, turn it on at least once every two years to make sure it's still working properly. Before running a motor with it, disconnect the motor and energize the AC drive for at least 5 hours.
Use a vacuum cleaner to remove any dust and dirt, especially around the ventilation ports and PCBs. Keeping these areas clean can prevent unexpected failures.
Troubleshooting and Fault Information
Your AC drive has a great fault diagnostic system with various alarms and fault messages. When a fault is detected, the right protective functions kick in. You can see the faults displayed on the digital keypad, and the four most recent faults can be read there too.
Note: You can clear faults with a reset from the keypad or the Input Terminal.
OC: Overcurrent
What's happening: The AC drive is noticing a spike in current.
Fixes:
- Make sure the motor's horsepower matches the AC drive's output power.
- Check the wiring between the AC drive and motor for any short circuits.
- Try increasing the acceleration time.
- Look for any signs of the motor being overloaded.
- If you've fixed a short circuit but the AC drive is still acting up, it might need to go back to the manufacturer.
OU: Overvoltage
What's happening: The DC bus voltage has gone above its max limit.
Fixes:
- Check that the input voltage is within the AC drive's rated range.
- Look out for any voltage spikes.
- Overvoltage can happen if the motor is regenerating energy. Try increasing the deceleration time or adding a brake resistor.
- Make sure the required brake power is within limits.
OH: Overheat
What's happening: The AC drive's temperature sensor is picking up too much heat.
Fixes:
- Ensure the ambient temperature is within the specified range.
- Keep the ventilation holes clear.
- Clean any foreign objects off the heatsinks and check for dirty fins.
- Provide enough space for good airflow.
Lu: Undervoltage
What's happening: The DC bus voltage has dropped below its minimum value.
Fix: Check that the input voltage is within the AC drive's rated range.
OL: Overload
What's happening: The AC drive is detecting too much output current.
Note: The AC drive can handle up to 150% of the rated current for up to 60 seconds.
Fixes:
- Check if the motor is overloaded.
- Reduce the torque compensation setting (Pr.7-02).
- Consider increasing the AC drive's output capacity.
oL1: Internal Electronic Overload Trip
What's happening: The drive's internal electronics are overloaded.
Fixes:
- Check for a possible motor overload.
- Look at the electronic thermal overload setting.
- Consider increasing the motor capacity.
- Make sure the drive's output current doesn't go over the value set by the Motor Rated Current (Pr.7-00).
oL2: Motor Overload
What's happening: The motor is overloaded.
Fixes:
- Reduce the load on the motor.
- Adjust the over-torque detection setting to a suitable level (Pr.06-03 to Pr.06-05).
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