pag. 13
MDE/C133 2561 001
MX3IPG2A
5. LOCAL INTERFACE
Key
It scrolls the menu to the left or selects
the digit to be changed, if the settings
change function is enabled. [
ï
]
Key
It resets the stored LED signals if the
cause has been removed, or the par-
tial counters, if you are in the "display
counters" menu.
It takes the end relays to quiescent
state when they are set to bistable
operation.
Key
If pressed for at least 2s, this key
enables the settings to be changed.
When the settings change is ena-
bled, the green LED (RUN) lights up
blinking. If pressed once again for at
least 2s, the system goes back to the
normal running conditions and, pro-
vided that a confirmation is given, the
new settings become the current
ones (the key can only be reached by
removing the cover). During the set-
ting change operations, the device
continues working with the old set-
tings. If the changes made are con-
firmed in the presence of a fault, they
are not made the current ones until
the event is over: the interrupt state is
signalled for 3s by a message on the
display unit, after which you are
prompted to confirm the changes
made.
If pressed upon feeding the device
with auxiliary voltage until a failure
message appears on the display,
this key inhibits the device from oper-
ating.
Keys
If simultaneously
pressed for at least 2s, these keys
enable the protection to be tested.
When the testing activity is enabled,
the green LED (RUN) lights up blink-
ing.
If simultaneously pressed for at least
2s during the TEST routine, these
keys enable you to leave the protec-
tion testing mode.
The local interface is made up of:
-
An LCD display unit organized on two lines of sixteen
characters each.
Through a special keyboard-controlled scanning, the dis-
play unit enables the settings to be read and changed, the
measurements, the counters, the logged events and the
diagnostic information to be read.
-
A keyboard or keypad made up of six keys, five of which can
even be reached when the cover is fitted through a special
link.
In addition to the above-mentioned scanning, the keyboard
is also used to change the settings, to carry out tests that
require commands to be sent and stored indications to be
set to zero. The keys that can be reached when the cover is
fitted only allow for read-out and reset operations.
Key
It scrolls the menu upwards or in-
creases a value, if the settings
change function is enabled. [
ñ
]
Key
It scrolls the menu downwards or
decreases a value, if the settings
change function is enabled. [
ò
]
Key
It scrolls the menu to the right or se-
lects the digit to be changed, if the
settings change function is enabled
[
ð
].