DC UNDERVOLT

What does 3220 mean?

The intermediate circuit DC voltage is insufficient, which can be caused by a missing supply voltage phase, a blown input fuse, or an internal fault within the rectifier bridge. The DC undervoltage trip limit is 0.6 × 1.35 × U1min, corresponding to 307 VDC for 400 V and 500 V units, and 425 VDC for 690 V units. This fault is associated with bit 2 of Fault Word 2 (3.06 FW 2).

• DC bus voltage is too low to operate the drive.
• Low input AC voltage.
• Insufficient power supply capacity.
• Fault in the DC bus rectifier or pre-charge circuit.

Click steps to track your progress.

1. 1

   Measure and verify the incoming three-phase main supply voltage at the drive input terminals (e.g., L1, L2, L3).

2. 2

   Inspect all main input fuses for continuity using a multimeter and replace any found to be blown.