DST2600 User’s Manual 23
tolerance window and in the same way can stop the engine if an anomaly requiring it
occurs.
“AUTO”: the engine start and stop, besides the loads changeover, are managed by
the device (the operator cannot takes part). All the protections are enabled.
“TEST”: this working mode is almost identical to the “AUTO” mode. It differs in the fact
that the engine is in any case started (automatically) by the board also in the mains is
present. However the operator can manually changeover the loads. The board passes
automatically to “AUTO” mode if the conditions for an automatic intervention of the
genset are verified (mains failure). For more details about TEST mode see par. 10).
“REMOTE START”: this working mode is almost identical to the “AUTO” mode. It
differs in the fact that the engine is in any case started (automatically) by the board
also if the mains is present. The loads are automatically connected to the generator
and the operator cannot take part on this actions. This working mode cannot be
activated from “OFF/RESET” and “MAN” mode. In “AUTO” or “TEST” mode, it can be
activated in two different ways:
o
The command is given activating one digital input, previously configured for
this function (the input has to be co
nfigured as “27 - Remote start request”. In
this case, to back to the “AUTO” mode it is necessary to deactivate the input.
o
The command can be sent over the serial port or by an SMS. In this case, the
command can be accepted only if one digital input of the board is configured
as “29 - Remote start enable”, and this input is activated. When the input will
be deactivated, the DST2600 immediately goes back to “AUTO” mode, even
if it has not yet received the reverse command from serial port / SMS.
DST2600 acquires the mains voltage of the plant (single-phase or three-phases), in order to
command automatic engine starts and stops (and the loads changeover) in the case of failure
upon the mains itself (AMF
– Automatic Mains Failure). The mains status is highlighted by the
“MAINS LIVE” LED (see par. 8.2.3).
DST2600 acquires the voltage (single or three phases) and the generator frequency with the
purpose to protect the loads and the generator from working out of the tolerance thresholds.
If generator voltages and frequency are not in their tolerance bands, the load changeover to
genset is not possible, also in “MAN” mode.
For three-phases systems the frequency measurement is done on the phase-to-phase voltage
L1-L2
It is possible to inhibit the automatic genset starting (for mains failure) in two different ways
By setting a digital input as inhibition command (code “25-Inhibition”). This command
is managed
only in “AUTO” mode: when the input is activated, the engine will not
automatically start for mains failure; if activated with engine running for mains failure,
there will be a stop cycle. In practice it corresponds to a mains simulation.
