IGBT Maintenance Time (50%)

What does LT-4 mean?

The drive's IGBTs (Insulated Gate Bipolar Transistors) have reached 50% of their expected performance life, indicating they are halfway through their typical operational lifespan. This is a pre-alarm for scheduled maintenance rather than an immediate fault, but if left unaddressed, it can lead to component degradation, unexpected failure, and costly downtime.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify the output frequency and analyze its impact on the IGBTs' operational stress.