MC40-SEF
Doc. N°
MO-0475-ING
Copyright 2012
FW: 1320.38.01.x
Date
06.09.2022
Rev.
1
Pag.
21
of
36
6. Digital Inputs
Three optoisolated, self-powered Digital Inputs D1, D2, D3 are provided.
A Digital Input is activated when its terminals are shorted by a cold contact.
D1
(Terminals 22 - 19)
:
It is usable as Function Blocking Input
D2
(Terminals 22 - 21)
:
It is used for Remote Trip
D3
(Terminals 22 - 20)
:
The digital Input indicates the position of the Circuit Breaker
(Input Closed = C/B closed; Input Open = C/B open).
If the option External Trigger = Enabled any time the DI passed from
closed to open the oscillographic recording is started.
7. Self-diagnostic
The relay incorporates a sophisticated self-diagnostic feature that continuously checks the following elements:
A/D conversion
Checksum of the settings stored into E
2
Prom.
DSP general operation (Power, Routines, etc.)
Lamp test (only on manual test).
Any time Power is switched on, a complete test is run; then, during normal operation, the test runs
continuously, and the checksum is done any time a parameter is stored into E
2
Prom.
If during the test any Relay Internal Failure (I.R.F) is detected:
If “I.R.F.”
is programmed to “Trip”
, the programmed output relays are operated same as on tripping of any
protection function operation is stored in the “Event Records”
and the I.R.F. signal led is set to flashing.
If “I.R.F.”
is programmed to “NO Trip”, and only the I.R.F. signal led is set to flashing.
