Power unit: Rectifier overtemperature

What does A05004 mean?

The rectifier in the power unit has reached its overtemperature alarm threshold. If the temperature rises by an additional 5 K, it will trigger fault F30037, potentially causing a drive shutdown. Causes can include high ambient temperature, excessive load, fan failure, or issues with the line supply. Ignoring this can lead to rectifier damage.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the cooling fan for proper operation, direction, and any obstructions.

2. 4

   Inspect all line supply phases for proper voltage and detect any potential defects in the incoming rectifier arms.