EL3040 EL3020 ABB flue gas analyzer EL3010 Key film Imported (original)

EL3040 EL3020 ABB flue gas analyzer EL3010 Key film Imported (original)

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If the synchronization pulse differs more than ±0.05 seconds for second-pulse or ±2

seconds for minute-pulse synchronization from the relay’s real-time clock, the

synchronization pulse is rejected.

Time synchronization is always triggered on the rising edge of the digital input

signal. The time is adjusted by accelerating or decelerating the relay's clock. By this

way the clock neither stops nor makes sudden jumps during the time adjustment.

The typical accuracy achievable with time synchronization via a digital input is ±2.5

milliseconds for second-pulse and ±5 milliseconds for minute-pulse

synchronization.

The pulse length of the digital input signal does not affect time

synchronization.

If time synchronization messages are received from a communication

protocol as well, they have to be synchronized within ±0.5 minutes at

minute-pulse or ±0.5 seconds at second-pulse synchronization.

Otherwise the time difference may appear as rounding errors. If it is

possible that the synchronization messages from the communication

protocol are delayed more than 0.5 seconds, minute-pulse

synchronization must be used.

When the minute-pulse synchronization is active and long time format

is sent via a communication protocol, the protocol's second and

millisecond part is ignored. The protocol's minute part is rounded to

the nearest minute. Short time format is ignored altogether.

When the second-pulse synchronization is active and long or short time

format is sent via a communication protocol, the protocol's millisecond

part is ignored. The protocol's second-part is rounded to the nearest

second.