Alstom MX3EG1A - 3.6 Main and spare settings; 4. ADDITIONAL FUNCTIONS; 4.1 Diagnostics; 4.2 Output circuits

pag. 9
MDE/A133 2295 001
MX3EG1A
3.5.3 DB dead-bar mode
ON-CHECK
The device checks that the generator
frequency and voltage lie
within the limits define
d by Dfb and DUb: if
these do not lie within
the mentioned limits, the device carries out all the adjusting
operations necessary to make them lie within the
range of values
defined. The 'parallel breaker closing' command will
be then sent.
3.6 Main and spare settings
The device can store two groups of settings, namely
'main' and
spare', which can be selected through keyboard, PC or
network.
The group of setting being used is shown on the display as
'SETTINGS I
N
USE'.
Independent
ly of the selection made
,
the device can be
'forced'
to use the SPARE settings. This 'forcing' can be carried out from
the network or by permanently enabling the digital input (IN
DIG 1)
configured t
o
such aim. This
condition is si
gnalled by the
characters <!> which appear near the group already selected;
when the input is disabled, the group of settings previously
selected is restored and the characters <!> disappear (see
paragraph 6.1.3).
4. ADDITIONAL FUNCTIONS
4.1 Diagnostics
Diagnostic activities are envisaged which are automatically carried
out upon powering on the device as well as from time to time
during the running, and which allow the following actions to be
performed:
-
signa
lling fa
ult or fail
ure cond
itio
ns. This sig
nal de-e
nerg
izes
the diagnostic relay
, turns off the green LED (running device)
and turns on the red LED ( faulty devi
ce);
-
locki
ng out the de
vice in th
e event of fa
ults th
at migh
t entai
l ill-
timed operation (VITAL FAULTS)
-
displ
aying t
he code r
efer
ring to t
he type o
f fault o
ccur
red.
The following faults are defined as NOT
VITAL FAULTS:
-
out
pu
t re
lay
(X
1 - X5
) fa
ult
y
-
com
mu
nic
ati
on
fau
lty
-
int
ern
al
clo
ck
fa
ult
y
The following faults are defined as VITAL FAULTS:
-
fe
ed
er
fa
ul
ty
-
EE
P
RO
M
fa
ul
ty
-
inte
rna
l o
r e
xter
anl
RAM
faul
ty
-
anal
og/d
igit
al
con
vert
er
faul
ty
In the event of
vital faults the device automatically displays the
code relative to the kind of fault occ
urred; if allowed by the device,
this condition can only be solved by enabling the 'settings change'
command.
In the event that, upon starting up the equipment, an EEPROM
failure makes it impossible to retrieve the information on the
selected dialogue language, the device will continue on
working
using Italian as default language.
The device includes the 'Watch Dog'.
The diagnostic activity is also aimed at signalling any condition of
'inhibited equipment': the relevant code is display
ed, the diagnostic
relay is de-energized and the red LED (faulty device) lights on.
This condition
can only be solve
d by enabling th
e
'settings
change' command.
The diagnostic menu also indicates the date when last
changes
were made to the
equipment.
4.2 Output circuits
The output circuits are composed of six relays: each of them is
provided with two contacts (see
block diagram).
The
X6 relay, nor
mally energize
d, is strictly ass
igned to the
diagnostic function.
Each remaining relay, if duly programmed from the keyboard, PC
or network, can be set
to carry out one or
more functions.
The operation of thes
e six relays is of monostable type:
that is,
it allows to immediate return to
the quiescent position when the
cause that operated it is
removed.
The output relays, except for the diagnostic relays, can all be
simultaneous
ly set
to 'normally energized' (NORMA
L.ON=ON)
or to 'normally de-energized' (NORMAL.ON=OFF): the selection
occurs bymeans of the S1 jumper which is
accessible when the
relay has been pulled out (see fig. 2a,
2b).