98 GC250 Technical Manual
EAAM057608EN
The stand-by status are those of
stop
and
no stop
(see par. 9.5.1). The controller deactivated
all commands to engine for both. The status of
no stop
means, therefore that the engine has
been started by others or that for any reasons, e.g. A failure on the fuel interception valve,
didn’t stop after a stopping cycle. From the controller point of view the two statuses are
different, since the engine protections are never activated as the controller considers that there
is another device that has started and is being checking the engine.
From stand-by statuses, when a starting cycle is required (manual or automatic sequence), if
the engine was
not stop
, the engine control unit is not commanded and we pass to the
running status
(in
MAN
) or that
of start-up confirmation
(in
AUTO
). If the engine was idle,
instead, the sequence proceed with the cycle of
pre heating
of the engine.
The
pre-heating
cycle is performed if parameter P.0209
is set (“pre-heating cycle duration)
different from zero. In this status the
FUEL
and
PREHEAT
. It is not obligatory to configure an
input as pre-heating command; this allows to use it even without pre-heating in order to add a
delay between commands
FUEL
and
START
.
If the
preheating
cycle is not performed, the controller manages an intermediate status of 0,2
seconds duration, where commands
FUEL
and
PREHEAT
are active. This status is necessary
to guarantee a minimum delay between the opening of the fuel electro-valve and the activation
of the engine control unit. This because some electro-valves can get stuck if there is already
fuel flow during the opening.
From the preceding statuses, it is possible to move forward with the
start
of the engine.
During the
start
, commands
FUEL
,
PREHEAT
and
START
are activated. If, instead, the
starting cycle ends (see previous notes about the starting sequence in manual mode) without
diagnosing the started engine status, the sequence proceed with:
The
starting check
status, if we are in
MAN.
. Actually, the given command could be
enough for the engine, which therefore could get started. In this state the engine has
to be checked for a maximum time of 10 seconds to check if it starts. It is only active
the command
FUEL
to favour the possible starting. If the engine does not get started
at the end of the 10 seconds, it returns to status
idle
.
The status
of delay between the two starts
if we are in
AUTO
,
TEST
or
REMOTE
START
. The duration of this status is configured with parameter P.0212
(“Delay
between two starts”). At the end we proceed towards the
washing
status. This status
is performed for a number of times configured with parameter P.0211
(“Number of
startin
g attempts”): if after all configured attempts the engine does not activate, the
controller activates the failure AL.022 (“A022 failed starting”) and proceed with the
stop
status. In this status, commands
PRE-HEATING
and
FUEL
(if requested) are
active, so to use this status for the pre-heating of the Diesel engine
spark plugs.
If the controller recognises the engine running status, the sequence goes on with the status
of:
Running
if we are in MAN.
Starting confirmation
if we are
AUTO
,
TEST
or
REMOTE START
. This status is
necessary to wait that the genset reaches the full speed. The engine could, in effect,
turn off (the controller could have diagnosed it only because it is the engine control
unit which lets it move). In these cases the controller has to attempt to start it again,
up to the end of the configured attempts. From this status we proceed towards
running
if the genset reaches the full speed (in this case the starting is real and an
eventual turning off is symptom of big anomalies on the genset); if the engine stops,
we proceed towards the
delay between two attempts
; towards the
stop
status if
the engine does not stop, but the genset does not reach the full speed within the time
configured with parameter P.0217
(“Maximum time for full speed conditions”): the
controller activates the failure AL.008 (“A008 – Failed full speed conditions”). In this
status only command
FUEL
is active.
In this status only command
RUNNING
is active.
