LU

What does 1030 mean?

An undervoltage condition exists in the DC bus, where the DC bus voltage is lower than the value specified in parameter C0173. This typically indicates insufficient input power to the drive.

• Input line voltage (L1, L2, L3) sag or complete phase loss (for 3-phase drives) below the drive's minimum operating threshold.
• Incorrect mains voltage setting (e.g., Parameter C0018) in the drive parameters, leading to an inaccurate DC bus reference.
• Undersized input power cabling or loose connections to the drive's input terminals (L1, L2, L3), causing voltage drop under load.
• Blown input fuses or tripped circuit breaker in the upstream power supply to the drive, leading to reduced or absent input voltage.
• Faulty rectifier or DC bus capacitor bank within the drive, unable to maintain stable DC voltage under load.

Click steps to track your progress.

1. 1

   1. Measure input line voltages (L1-L2, L2-L3, L3-L1 for 3-phase) at the drive's input terminals with a multimeter, ensuring they are within the drive's specified range.

2. 2

   2. Verify the drive's input voltage parameter (e.g., C0018) is set correctly to match the actual supply voltage (e.g., 400V, 480V).

3. 3

   3. Check all input power fuses and circuit breakers upstream of the drive for continuity or tripped status and reset/replace as necessary.

4. 4

   4. Inspect input power cable connections at the drive's L1, L2, L3 terminals and at the main power distribution for looseness, corrosion, or signs of overheating.

5. 5

   5. Monitor the DC bus voltage (e.g., Parameter P0003) during motor startup and steady-state operation to observe voltage dip under load.