MC30-BC
Doc. N°
MO-0365-ING
Copyright 2008
FW 980.09.01.X
Date
15.06.2022
Rev.
1
Pag.
22
of
37
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 to switch setting from [In] to [InL].
Terminals shorted
= Reference primary current set at [InL] value
(If
parameter Md is set to “InputSE”).
Terminals open
= Reference primary current set at [In].
D3
(Terminals 22 - 20)
:
The digital Input is used to get 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 switch 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 auxiliary power supply is switched on, a complete test run. 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 Internal Relay Failure (I.R.F) is detected following actions take place:
If “I.R.F.”
is programmed to “Trip”
, the programmed output relays are operated as on tripping of any protection
function.
Operation is stored in the “Event Records”
and the I.R.F. signal led is flashing.
If “I.R.F.”
is programmed to “NO Trip”, only the I.R.F. signal led starts flashing.
