Optional function

Communication on MODBUS RTU Protocol

Other Functions

Self Supervision

The IED is provided with an extensive self-supervision system which

continuously supervises the software and the electronics.

It handles runtime fault situations and informs the user about an existing fault via the LHMI.

When in an IED internal fault is detected, the green Ready LED ceases to

glow and the self-supervision output contact is activated. Internal fault

indications have the highest priority on the LHMI. None of the other

LHMI indications can override the internal fault indication. An indication

about the fault is also shown as a message on the LHMI. The text IRF with

an additional text message, a code is shown to indicate the fault type.

The user can try to eliminate the fault by restarting the IED. If the fault is

still found, the IED stays in internal fault mode. All other output contacts

are released and locked for the internal fault.

The self-supervision signal output operates on the closed circuit principle.

Under normal conditions the relay is energized and the contact gap 5-6 in

connector XK2 is closed. If the auxiliary power supply fail or an internal

fault is detected, the contact gap 5-6 is opened.