5-90 B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUALPRODUCT SETUP CHAPTER 5: SETTINGS55.3.7.4 Local timeSETTINGS PRODUCT SETUP REAL TIME CLOCK LOCAL TIMEThe B90 maintains two times: local time and Universal Coordinated Time (UTC). Local time can be provided by IRIG-Bsignals. UTC time is provided by SNTP servers.The real-time clock (RTC) and time stamps reported in historical records and communication protocols can be incorrect ifthe Local Time settings are not configured properly.See the IRIG-B section in the Installation chapter for guidance on these settings when using an IRIG-B source that sets theIRIG-B control bits according to IEEE Std 1344-1995.LOCAL TIME OFFSET FROM UTC — Used to specify the local time zone offset from UTC (Greenwich Mean Time) in hours. Timezones in the eastern hemisphere have positive values; time zones in the western hemisphere have negative values. A valueof zero causes the relay to use UTC for local time. This setting has two uses. When the system RTC is synchronized with acommunications protocol providing only local time or it is free-running, the offset setting is used to calculate UTC from thelocal time these provide. When the RTC is synchronized with a communications protocol providing only UTC (such as PTP orSNTP), the time offset setting is used to determine local time from the UTC provided. PTPALTERNATE_TIME_OFFSET_INDICATOR TLVs are not used to calculate local time.DAYLIGHT SAVINGS TIME and DST — Can be used to allow the relay to follow the DST rules of the local time zone. Note thatwhen IRIG-B time synchronization is active, the local time in the IRIG-B signal contains any daylight savings time offset andso the DST settings are ignored.5.3.8 User-programmable fault reportSETTINGS PRODUCT SETUP USER-PROGRAMMABLE FAULT REPORTS USER-PROGRAMMABLE FAULT REPORT1(2) LOCAL TIME LOCAL TIME OFFSETFROM UTC: 0.0 hrRange: –24.0 to 24.0 hr in steps of 0.5 DAYLIGHT SAVINGSTIME: DisabledRange: Disabled, Enabled DST START MONTH:JanuaryRange: January to December (all months) DST START DAY:SundayRange: Sunday to Saturday (all days of the week) DST START DAYINSTANCE: FirstRange: First, Second, Third, Fourth, Last DST START HOUR:2:00Range: 0:00 to 23:00 in steps of one hour DST STOP MONTH:JanuaryRange: January to December (all months) DST STOP DAY:SundayRange: Sunday to Saturday (all days of the week) DST STOP DAYINSTANCE: FirstRange: First, Second, Third, Fourth, Last DST STOP HOUR:2:00Range: 0:00 to 23:00 in steps of one hour USER-PROGRAMMABLE FAULT REPORT 1 FAULT REPORT 1FUNCTION: DisabledRange: Disabled, Enabled PRE-FAULT 1 TRIGGER:OffRange: FlexLogic operand
