Question:
Which DC-bus voltage thresholds are effective in the 9400 for the undervoltage message (LU) (LU thresholds)?
Answer:
For the 9400, the following fixed undervoltage thresholds are effective for the DC bus voltage depending on the mains voltage selected under C00173:
- C00173 = 0 (230 V): LU set = 200 V; LU reset = 225 V
- C00173 = 1 (400/415 V): LU set = 285 V; LU reset = 430 V (as of device size 8, the LU set threshold is 400 V)
- C00173 = 2 (460/480 V): LU set = 490 V; LU reset = 535 V
- C00173 = 3 (500 V): LU set = 540 V; LU reset = 585 V
- C00173 = 4 (230 V): as for 0, but LU threshold can be set under C0174
- C00173 = 5 (400/415 V): as for 1, but LU threshold can be set under C0174
- C00173 = 6 (460/480 V): as for 2, but LU threshold can be set under C0174
- C00173 = 7 (500 V): as for 3, but LU threshold can be set under C0174
If C0173 >= 4, the LU threshold can be variably adapted under C00174.
This is useful if systems shall e.g. be operated on a 400-V and 480-V mains without changing the parameter setting.
For comparison, the LU thresholds of the 9300 series:
- C0173 = 0 (<400 V): LU set = 285 V; LU reset = 430 V
- C0173 = 1 ( 400 V): LU set = 285 V; LU reset = 430 V
- C0173 = 2 ( 400 V): LU set = 328 V; LU reset = 475 V
- C0173 = 3/4 ( 460 V): LU set = 342 V; LU reset = 490 V
