FANOX SIA-C, User Manual

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5.5. Self-diagnosis
Diagnostic algorithms are run while the equipment is being started up and continuously when
the relay is operating. This diagnostic is a preventative process to guarantee that the equipment
is in good operational condition.
As general considerations we can establish:

Communications among the different processors are confirmed by corresponding
integrity checks. In case of having continued anomalies, the equipment would reset.

Information data which is considered
“setting parameters” is confirmed by the
corresponding checks. In this way, all the setting tables are doubled and the relay is
able to work with one broken table but not two.

There is a mechanism of WatchDog,
among the different main CPU’s. The loss of
activity for any of them would mean the equipment reset, remaining as an event in the
memory.
The following status bits are associated with this process:
Trip power error
Problem in the voltage of trip circuit
Measurement error Problem in the measurement block
Protection error Problem in the protection block
Eeprom error Problem in the eeprom memory, default settings
On the other
hand, “Settings by default” indicates that the relay is working with the settings
programmed in factory, being all the protection functions disabled.
5.6. Date-time synchronisation
All models of relay SIA-C are provided with a real time clock (RTC), which can be synchronized
by HMI or by communications. RTC keeps the data updated during at least 72 hours without
power supply. Charge time for the capacitor is 10 minutes.
This clock can be synchronized by two ways:

By HMI: in this case, it is allowed to register the date and the time by using the keys on the
front panel. The relay will save a new event indicating the synchronization.

Protocol. The behaviour is similar to HMI, the relay synchronizes date and time and saves a
new synchronization event.