Phase failure

What does F2818 mean?

One or more phases of the three-phase AC mains input power supply have failed or are missing. This leads to an unbalanced or insufficient supply voltage for the drive's rectifier and DC bus. Operating with a phase failure can cause excessive ripple on the DC bus, overheating, and damage to the drive components.

• Blown fuse on one of the input phases
• Open circuit breaker for an input phase
• Loose or broken wiring in the mains input circuit
• Mains contactor failure for one phase
• Power grid issue causing loss of a phase

Click steps to track your progress.

1. 1

   Measure the three-phase AC supply voltage (L1-L2, L2-L3, L3-L1) at the drive's input terminals to confirm balanced and nominal values.

2. 2

   Inspect the main power cabling and connections from the upstream power source to the drive's input terminals for damage, looseness, or disconnections.

3. 3

   Check all upstream protective devices (circuit breakers, fuses, main contactors) for proper operation, tripped status, or signs of failure, ensuring all phases are correctly supplied.

4. 4

   Verify the drive's input power parameters (e.g., nominal voltage, phase monitoring thresholds) match the actual mains supply and application requirements.