ABB REF 610 Technical Reference Manual

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ABB REF 610 Technical Reference Manual Manual pdf 22 page image

,.==.- 15> A040280Fig. 5.1.1.7.-3 Warning with numeric codeFor fault codes, refer to Section 5.1.18. Self-supervision (IRF) system.5.1.1.8. Time synchronizationTime synchronization of the relay’s real-time clock can be realized in two differentways: via serial communication using a communication protocol or via a digitalinput.When time synchronization is realized via serial communication, the time is writtendirectly to the relay’s real-time clock.Any digital input can be configured for time synchronization and used for eitherminute-pulse or second-pulse synchronization. The synchronization pulse isautomatically selected and depends on the time range within which the pulse occurs.Two detected pulses within acceptable time range are required before the relayactivates pulse synchronization. Respectively, if the synchronization pulsesdisappear, the relay takes time that corresponds to the time range of four pulsesbefore de-activating pulse synchronization. The time must be set once, either viaserial communication or manually via the HMI.When the time is set via serial communication and minute-pulse synchronization isused, only year-month-day-hour-minute is written to the relay’s real-time clock, andwhen second-pulse synchronization is used, only year-month-day-hour-minute-second is written. The relay’s real-time clock will be rounded to the nearest wholesecond or minute, depending on whether second- or minute-pulse synchronization isused. When the time is set via the HMI, the entire time is written to the relay’s real-time clock.If the synchronization pulse differs more than ±0.05 seconds for second-pulse or ±2seconds for minute-pulse synchronization from the relay’s real-time clock, thesynchronization pulse is rejected.Time synchronization is always triggered on the rising edge of the digital inputsignal. The time is adjusted by accelerating or decelerating the relay's clock. By thisway the clock neither stops nor makes sudden jumps during the time adjustment.The typical accuracy achievable with time synchronization via a digital input is ±2.5milliseconds for second-pulse and ±5 milliseconds for minute-pulsesynchronization.22REF 610REF 610 Feeder Protection RelayTechnical Reference Manual1MRS755310