For rails that are off due to fault response and ON_OFF_CONFIG set to AUTO, the only way to power them on again is to enable the re-sequence option at its fault response. With the re-sequence option, the faulted rail plus its fault shutdown slaves is re-sequenced when the retry account of the faulted rail is exhausted. The re-sequencing times and intervals are set through Global Configuration → Misc_config as shown in Figure 22.
For more FAQ please check the following document.
UCD90xxx Family Frequently Asked Questions and Answers
UCD9090 UCD9090A UCD90120 UCD90120A UCD90124 UCD90124A UCD90160 UCD90160A UCD90240 UCD90320 UCD90320U