Line frequency fault

What does F385 mean?

With HVR power supply units only! The mains frequency exceeds the permissible tolerance of ± 2Hz, indicating a deviation from the expected 50Hz or 60Hz nominal frequency.

• Mains frequency exceeds permissible tolerance (± 2Hz) from the nominal system frequency.

Click steps to track your progress.

1. 1

   Measure the incoming line frequency at the input terminals of the Indramat HVR power supply unit (X1/L1, X1/L2, X1/L3) using a frequency meter or a multimeter with frequency measurement capability.

2. 2

   Verify the measured frequency is consistently within ±2Hz of the nominal system frequency (e.g., 50Hz ± 2Hz or 60Hz ± 2Hz).

3. 3

   Check the stability of the upstream power grid and the power source quality.

4. 4

   If available, review power quality logs or consult with the power utility provider regarding frequency variations or instability.