1MDU07205-YN rev. F
REF601 CEI
User’s manual
13
REF601 CEI overview
If an internal fault disappears, the green Ready LED starts glowing and the IED
returns to the normal service state. The fault indication message remains on the
LCD until manually cleared.
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.
Fig. 1 – Output Contact
5
6
Unit
Ready
5
6
Ready
Condition
IRF
Condition
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