How to repair your AC and DC drives

How to repair your AC and DC drives

Repairing your AC and DC drives is never easy – especially if you want professional service. It may be difficult to do on your own, but it definitely isn’t impossible. To do a really professional job, you need to be patient, take your time and make sure to check over everything once you’re finished – doing it yourself will save you a bit of money from repair services and will make you feel all the more accomplished! If all tests are passed and you still can’t quite work out what’s wrong, it may be a good idea to call a tech to have a closer look.

1. Take notes

When repairing any industrial equipment, such as AC and DC drives, you need to make a note of any important aspects of the equipment, such as the manufacturer and serial number. It is also a good idea to note down the reason for the repair of service, how urgent the repair is, and any visual observations you can make about the equipment.

2. Carry out diode tests

Testing the input and output power sections of AC and DC drives will make sure that no further damage will be caused if power is applied to the unit. If there is a short on the input or output side of the AC and DC drives, then applying power could potentially damage to equipment – so, use a meter to properly test these values. If there is a short, it is a good idea to disassemble the equipment to identify the cause of the short and issue a repair or replacement.

3. Apply power

If all is well following your diode tests, then power up your AC and DC drives. Abide by safety precautions to prevent injury – it’s recommended that you slowly increase the voltage until the input is achieved, instead of switching to full power all at once. If the drive gives a display, then all should be working at this point. If it doesn’t then, like with the diode test, the drives should be disassembled and diagnosed for any potential repairs or replacements.

4. Run a motor

If all other tests have passed, then it’s time to run a basic jog function. Make sure to backup whatever program you use for this. Then, reset the the AC and DC drives to factory defaults, and run the motor to see if it will work. If not, then check the output voltages to see if the motor speed controller is firing up properly to move the motor.


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