86 GC250 Technical Manual
EAAM057608EN
DOF.3012 -
“One of the automatic modes”. The output is activated when the controller
is in one of the automatic operation modes, that is
AUTO
,
TEST
or
REMOTE START
.
9.1.2
Operation modes and logics AND/OR
The controller makes available its own operation mode for the AND/OR logics by means of
the following internal statuses:
ST.000 -
“OFF/RESET”.
ST.001 -
“Manual”.
ST.002 -
“Automatic”.
ST.003 -
“Test”.
ST.004 -
“Remote Start”.
9.2
ATTENTION!
The device manages the mains voltage only with SSB type plants
(P.0802 =1, see par. 5.6.1In fact, every digital input can have an AND/OR logic
associated, which determines its status (see par. ). What indicated in this paragraph
does not make sense on SPM type plants (P.0802 =0).
The device acquires the system’s mains voltage (single-phase or three-phase) to the purpose
of commanding automatic start-ups and arrests of the engine in case of anomaly on the mains.
(for SSB and SSB plants). In emergency systems, the controller board starts the generator
(and changes-over the loads to it) when the mains is out of tolerance; it changes-over the
loads to the mains and stops the genset when the mains returns in tolerance.
The status of the mains can be acquired in various ways:
▪
From its internal sensor
by means of the terminals
T.22..T28
(see par.5.9 and
9.2.1). In order for the device to use the measures of the mains voltages and
frequency, the operator has to set the mains rated voltage through parameter P.0116.
▪
By means of the digital input configured with the f
eature “DIF.3101 – External
mains sensor”
. When said input is active, the mains is considered in tolerance; when
it is not active, the main is considered out of tolerance.
INFORMATION!: if the digital input is active, the mains is considered in
tolerance, even if the measure of the JH sensor is enabled and if said measure
indicates that the mains is out of tolerance.
9.2.1
Internal sensor
In the event the sensor can be used to acquire the mains measures, there are various
parameters that influence its management:
P.0105: rated generator frequency. Also used as mains rated frequency. All
frequency-related thresholds are expressed in percentage respect to this parameter.
P.0119: set it to 3 if mains is three-phases and 1 if single-phase.
P.0116: nominal voltage. Its value must be the nominal phase-to-phase voltage for
three-phase systems and phase
–to–neutral voltage for single-phase systems.
Thresholds are expressed as a percentage of it. If set to zero, mains voltage is
considered still not present, even if physically connected (it is anyway measured and
displayed).
P.0201: hysteresis applied to all the thresholds related to mains voltage and
frequency. It is a percentage value related to P.0116 and to P.0105.
P.0203: low mains voltages threshold (percentage respect to P.0116); under this value
mains is considered anomalous.
