Input Phase Fault

What does 10 mean?

A malfunction in the supply voltage or issues with input fuses/cables are detected. The supervision for this fault requires a minimum load of 10-20% to function correctly. This fault indicates a problem with the incoming power supply to the drive, which can cause motor and drive instability.

• Loss of one or more phases (L1, L2, L3) from the main incoming power supply to the drive.
• Blown input fuse (e.g., F1, F2, or F3) upstream of the drive, leading to an unbalanced input voltage.
• Loose or corroded connection at the drive's input terminals (L1, L2, L3) or upstream power distribution points.
• Severe voltage imbalance (e.g., >3% deviation between phases) on the incoming supply due to grid issues or heavy single-phase loads.
• Failure of the drive's internal input voltage sensing circuit or rectifier components.

Click steps to track your progress.

1. 1

   Measure all three phase-to-phase input voltages (L1-L2, L2-L3, L3-L1) at the drive's input terminals.

2. 2

   Check continuity of all input fuses (e.g., F1, F2, F3) using an ohmmeter, replacing any open fuses.

3. 3

   Inspect all input power wiring for loose connections, damage, or signs of overheating from the main breaker to the drive.

4. 4

   Verify the supply voltage monitoring parameters (e.g., P4-10 Input Phase Loss Threshold) are appropriately configured for the application.

5. 5

   Measure the current balance between input phases (L1, L2, L3) with a clamp meter during operation, looking for significant imbalances.