EAAM057608EN
GC250 Technical Manual 83
9
9.1
There are five device management modes:
OFF/RESET
: the genset is off (or in the arrest phase), the anomalies are all cancelled
and you can access the programming to modify the parameters. The GCB switch is
open to isolate the generator from the loads. The MCB breaker is closed to connect
the loads to the mains.
MAN
: genset start and stop, and also the management of GCB and MCB circuit
breakers (if present and if configured) are to be performed by the operator (the
controller board does not perform these operations automatically): the protections
being enabled, the controller can automatically open GCB, stop the genset and close
MCB (if present) in case of need. The access to the programming is not allowed.
AUTO
: genset start/stop and the management of the GCB and MCB breakers are
performed by the controller board (the operator cannot interfere). All protections are
enabled. The access to the programming is not allowed.
TEST
: this working mode is almost identical to
AUTO
. The only difference is that the
engine is anyway (automatically) started even with mains and/or automatic
intervention inhibition contact ON. The parameter P.0222
“Enabling test loading”,
allows indicating to the controller if it must automatically change-over the loads to the
generator. In any case, the operator is authorized to control the MCB and GCB
breakers just like in
MAN
. When the controller goes back to
AUTO
mode (when the
test is finished), the loads are automatically changed-over to the mains and the engine
is stopped with normal procedure. The controller automatically switches from TEST to
AUTO in case existing conditions require an automatic intervention by the genset. The
access to the programming is not allowed.
REMOTE START
: this working mode is almost identical to
AUTO
. It only differs for
the fact that the engine is started in any case (automatically), even with mains live
and/or inhibitions to the automatic intervention; the controller automatically provides
for the GCB circuit breaker closure (prior to opening of MCB, if the temporary parallel
with the mains is not considered). Such mode is priority compared to
TEST
(that is, it
can interrupt or swap with the periodic test). It is also priority compared to
AUTO
(once
activated the remote start, any requests of automatic intervention are ignored). The
operator
doesn’t have power to manually activate GCB and MCB circuit breakers. The
access to the programming is not allowed.
The operating mode can be selected in two different ways:
Using buttons “
STOP
”, “
AUTO
” and “
START
” of the controller. The buttons must be
pressed consecutively and held for at least half a second to force mode change. The
buttons are disabled (on the first line of the display a key-shaped icon appears) if at
least one of the inputs described below exists and is active.
Using one or several inputs configured with the following functions:
▪
DIF.2271
“OFF by remote control”.
▪
DIF.2272
“MAN by remote control”.
▪
DIF.2273
“AUTO by remote control”.
When one of these inputs is active, the operating mode of the controller is forced and
you can no longer use the buttons on the panel, nor the controls of the serial ports to
change it (the first line of the display shows a key-shaped icon).
When neither of these inputs is active, you are again able to use the buttons and the
controls of the serial ports to change the operating mode.
If there are multiple active inputs at the same time, priority is given to the input that
forces
OFF/RESET
mode, followed by the one that forces
MAN
mode and finally the
one that forces
AUTO
.
mode.
