Code

Name

Causes

Possible Solutions

LT-4

IGBT Maintenance Time (50%)

The IGBT is at 50% of its expected performance life.

Check the load, carrier frequency, and output frequency.
Note:

When the estimated performance life is expired, the terminal assigned to H2-01 to H2-04 = 2F [MFDO Function Select = Maintenance Notification] will be ON.