Alstom MX3EG1A - 4.12 Inhibiting operation-deconfiguration from network; 4.13 Serial communication on LONWORKS (TM) bus

pag. 11
MDE/A133 2295 001
MX3EG1A
4.13 Serial communication on LONWORKS
(TM)
bus
In the version including the bus board, the device
can communicate
with a central monitoring and control system at a speed of
1.2 5
Mbaud. The connection to the field bus is made through terminals:
43 and 45.
The communication board, which can even be added afterwards,
is enabled only
if the
special
jumper is provided in
S6, and
is
disabled when the mentioned jumper is placed vertically between
S5 and S6 (see fig.1).
The positioning of the jumper in S6 without the above mentioned
communicatio
n board, causes,
just as a faulty board, a failure
message to be displayed in the diagnostics function.
In the Appendix A all the data available for the
network are shown.
4.9 Alphanumeric code
The device can be identified in the
system by an alphanumeric
code, which can be set by the user directly on the equipment code
or from a PC.
With a network-linked device, the alphanumer
ic
code can only be modified by operating through the network.
4.10 Language
The device can display information in four
languages: Italian,
English, French and Spanish. The language can
be selected
through the keyboard.
4.11 LCD settings
The display can be set for fixed (OFF) or timed (ON) backlighting;
in the last case, the di
splay lights up for
300s any time a key is
pressed.
4.12 Inhibiting
operation-decon
figuration
from
network
Inhibiting the device is useful
in already operating systems, to
avoid troubles when a protection is to be
fed with voltage whose
settings are not known or meant to be changed
.
The inhibiting occurs by keeping the 'setting change' key pressed
for about 2s, and using
auxiliary voltage simultaneo
usly until the
following message is
displayed:
[
BLOC
]
[
]
When the said key is released, the condition of the inhibited
device is signalled with a
message in the P fault diagnostics.
The operation reset is only made possible by selecting the setting
change function, whi
ch is however enabled;
a momentary loss
of the auxiliary voltage does not change the
device inhibition state.
If the device is
equipped with a network board, from the BLOC
condition, by furtherly keeping the setting change
key pressed for
about 2s, the following message is
displayed:
[
NET
RESET
?
]
[_
NO
YES
_]
If confirmed, the device can even leave its network configuration.
The complete network de-configuration and inhibiting procedure
is necessary every time the device must be replace
d.
The reset of an inhibited and de-configured device entails the
displaying of K fault messages until a new setting of the device
itself has not been made.
The operation reset is only made possible by selecting the setting
change function, which is however enabled.
fig. 1
I
CAUTION
Hazardous voltages canremain in the unit even in the absence
of power supply
or after it has been
pulled out of its casing
(capacitor storage).
TOP
RELAY
FRONT
view A-A
view A-A
view A-A
BOARD
NOT
ENABLED
BOARD
ENABLED