What to Do When a Drive Fails
Localizing Machine Errors with a Defective Drive
Last updated: 05/22/2024
Often, machines display various error messages on the screen when drives fail. However, this data is often insufficient for precise error analysis,
as it indicates a defect but rarely specifies the exact cause or affected drive.
In such cases, it is necessary to open the control cabinet and manually search for the issue.
Most drives have LEDs or displays showing their status and an alarm number during faults, which must be decoded.
Error detection is easiest when the drive is completely unresponsive, allowing quick fault localization.
Manuals Provide Initial Clues
Information on alarm states can be found in service manuals, which can be very helpful. Since the faulty module is not always obvious
(e.g., Mitsubishi MDS drives may have multiple drive modules in one machine), all modules display various alarm messages during a fault.
This can complicate troubleshooting, as it is unclear which module is causing the error.
Potential causes include a failed power supply with defective regeneration or a spindle module overloading the power supply.
Experience is required for effective troubleshooting in such cases.
If the cause remains unclear, all modules can be removed and tested at a specialized workshop to identify those operating at their limit.
Often, a module from another similar machine can be used to identify the fault. However,
it is important to ensure that the devices are indeed compatible and that the parameters match.
Reading Parameters via Software
Especially with Japanese manufacturers, parameter handling can be complex. Many simple drives require no parameters besides the address,
as these are loaded from the control. However, there are increasingly drives with hundreds of parameters.
Reading these parameters requires parameter software and experience in its application. Replacing drives can also be problematic,
as different motors may be installed, necessitating parameter adjustments.
We are happy to assist you with troubleshooting to the best of our knowledge and abilities. Do not hesitate to contact us with any questions.
