Mitsubishi servo drives are vital components in industrial settings, but like any machinery, they can encounter issues. Understanding common fault indicators and their root causes is essential for effective troubleshooting. Here's a breakdown of typical faults and diagnostic methods:

1. UVT Faults:
UVT (Under Voltage Trip) faults often stem from voltage irregularities at the DC bus side. Sampling a low voltage value through resistive voltage division, comparing it with a standard value, helps diagnose normal, overvoltage, or undervoltage conditions. Notably, damaged optocouplers contribute significantly to undervoltage faults in Mitsubishi A500 series inverters.

2. E6, E7 Faults:
E6 and E7 faults are prevalent in Mitsubishi frequency inverters and can result from various factors:

Damage to the integrated circuit 1302H02, responsible for drive waveform conversion and signal detection.
Faulty signal isolation optocouplers between the IC and the CPU board.
Damaged or poorly connected connectors between the CPU and power boards.

3. Common Product Series Faults:
Prominent Mitsubishi servo drive series include A700, E700, F700, and D700. Specific issues include:

A700 series: Potential UV faults due to rectifier circuit issues and common power supply failures, notably M51996 waveform generator chips.
E700 series: Frequent Fn faults caused by fan damage, not necessarily halting output during alarms.
Additionally, the AL.17 and AL.19 error codes indicate abnormal circuit board and memory conditions, respectively, requiring thorough inspection and potential component replacement. AL.1A signifies motor cooperation abnormalities between servo amplifiers and motors, necessitating collaborative diagnosis and corrective action.

In conclusion, diagnosing and resolving faults in Mitsubishi servo drives necessitate a comprehensive understanding of potential issues across different product lines. Regular maintenance and prompt troubleshooting are essential for ensuring uninterrupted industrial operations.