Maintenance timer

What does MT mean?

This indicator appears when the inverter's cumulative energization time reaches or exceeds the value set in parameter Pr.504. It serves as a reminder that routine maintenance may be due for the equipment.

• Cumulative energization time has reached the threshold set in Pr.504 (Maintenance timer setting).
• Environmental conditions (e.g., high temperature, dust) accelerate component wear, making maintenance due earlier than anticipated.
• Cooling fan operating hours exceeding recommended service life.
• Electrolytic capacitor aging approaching end-of-life.

Click steps to track your progress.

1. 1

   Record the current operating hours displayed (e.g., Pr.504 related monitor value) for historical tracking.

2. 2

   Inspect cooling fans for bearing noise, reduced airflow, or physical damage, and clean or replace if necessary.

3. 3

   Clean inverter heatsinks and cooling passages to ensure optimal heat dissipation.

4. 4

   Visually inspect electrolytic capacitors on the main circuit board for bulging or leakage.

5. 5

   Reset Pr.504 (Maintenance timer setting) after completing maintenance tasks.