Alstom MX3EG1A - 4.3 LED signalling circuits; 4.4 Digital inputs; 4.8 Test

pag. 10
MDE/A133 2295 001
MX3EG1A
4.3 LED signalling circuits
The signalling circuits are made up of twelve LEDs (see fig. 3).
Four LEDs are strictly assigned to previously established signalling
functions:
-
green
LED
(Uaux)
ON in
the pr
esence
of powe
r sup
ply and
correct feeder output voltage values
-
green
LED (RU
N)
ON with
fixed l
ight in
normal
conditio
ns and
blinking light during setting change or test
operations
-
red
LED
(RUN)
ON
with
fixe
d
ligh
t
when
the
diag
nost
ics
detects a fault or the
device is inhibited.
-
gree
n LED (
Rx Tx)
ON wit
h fixe
d ligh
t when
the de
vice i
s
correctly connected to the network; ON with blinking
light when
the communicati
on board is not enabled
or configured
;
OFF
when the device is provided with
no communication board.
Each of the
eight remaining
LEDs, if duly
programmed from
the
keyboard, PC or network, can be:
-
assig
ned to
one or
more
contr
ol out
puts o
r, in t
he eve
nt of
failures or events,
-
pr
e
-s
et
f
o
r
:
- monostable operation; it immediately goes off when the
cause that made it go on is removed
- bistable operation (MEMOR): the LED remains on until a
reset signal is sent
from the front push-button, digital input or
serial connection. Any failure of auxiliary voltage entails the
momentary loss of the luminous signals, which are reset as
soon as the voltage is restored.
A pocket is provided close to the LEDs, where explanatory la
bels
can be placed.
4.4 Digital inputs
If duly programmed from the keyboard, PC or
network, each of
the five optoinsulated inputs can be assigned to
one or more of the
following function
s referring to the device.
-
S
t
a
r
t
L
B
-
S
t
a
r
t
D
B
-
Sy
nc
hr
on
is
m
St
op
-
Ch5
2 pa
ral
lel
bre
ake
r cl
osi
ng
-
EX
T1
, EX
T2 e
xte
rn
al f
ail
ur
e
The factory settings envisage that the
above mentioned functions
are assigned
according to the
block diagram (fig. 3).
The input voltage can differ from the auxiliary voltage of the
device.
The enabling of the digital inputs
can be programmed by normally
energizing or de-e
nergizing or on front or
level.
WARNING:
the digital inputs associated with the Start LB
and Start DB functions must be ON on front , whereas all the
other functions must
be ON
on level.
4.5 Counters
Each type of tripping is associated with a partial or total counter
(see paragraph 6.1.7).
The counters work within the 0-9999 range; if
9999 is exceeded,
the counter is automatically set to zero and the counting restarts
from zero.
All the partial counters can be set to zero from the keyboard, from
PC or network.
4.6 Event log
When an event occurs, the following information is stored in
circulating memory:
- day, month, year,
time, minute, second and thousandth of a
second concerning the tripping moment
- type of event
- bar frequency
- generator frequency
- bar voltage
- generator voltage
- phase difference
- total parallel time
- number of parallel attempts
All this information is called 'event'.
The circulating memory allows the last eight events to
be stored,
and when this number is excee
ded, a
new record replace
s the
older: the last event is sto
red as EVENT 1.
The stored events can be read from the front display unit or from
a PC serially connected to the
device.
Furthermore, the device can store
the last
32 changes of
state
(with relative date and time) and make them readable through PC
or network only.
4.7 Measurements
The device can display the
effective current values concerning
the bar voltage expressed in Ubn multiples, the generator voltage
expressed in
Ugn multiples,
the bar
and generator
frequency
expressed in Hz, and the
phase difference expressed in grades.
It also displays the effective current primary values relative to the
bar and generator voltage expres
sed in V.
4.8 Test
Besides the normal diagnostics already dealt with, the device
also offers, in the TEST mode, the possibility of testing the
leds,
the display and the output relays.
-
The L
ED te
st tu
rns o
n all
the
LEDs
from
L1 to
L8 an
d the
display unit (LCD) for two seconds.
Once the test is over, the LEDs that were supposed to be ON
before the test remain ON and the display unit goes back to the
previous information displayed; the test can be carried out
during any running condition, without affecting the operation in
progress.
-
The re
lay te
st allo
ws the o
utpu
t rela
ys fro
m X1 to X
5 to be
sequentially select
ed
and checked for correct oper
ation. IN
this way, any external signalling or control circuit can be
tested.
The tested relay remain
s energized for 150 and 200 ms.
If commands are already present, the
test cannot
be carried
out and a
message appears on the display unit.
The test on auxiliary relays does not affect counters, event
logs and LEDs.