5
STATYS 200-1000A
- Ref.:OPMSTA200910-GB_06
ENGLISH
5. 1. M
anual
transFer
the user is able to control the transfer of the load from one source to another, both via the keypad and via commu-
nication (see "communication interface" § 9).
manual transfer does not disturb the supply to the load.
If the synchronisation conditions are not met after 30 seconds (factory default setting), an asynchronous transfer oc-
curs, if authorised, otherwise the request is cancelled.
If the transfer cannot take place (for example, 2nd source out of tolerance), the following icon appears:
note: the alarm will shut off automatically when normal conditions are restored.
5. 2. a
utoMatic
transFer
Automatic transfer occurs in the event of a voltage drop, frequency drop or when the preferred source is unavailable.
It does not interrupt the supply to the load. Automatic transfer switches the supply from the preferred source to the
alternate source. once the preferred source is re-established, the system automatically returns to this source after a
time delay, which can be configured by the user.
The parameters that define the quality thresholds of the source and the automatic return can be adjusted in program
-
ming mode (see § 7.1.10 or 7.2.6)
to ensure totally secure transfer, StAtyS continuously monitors the presence of the alternate source.
If the alternate source is unavailable (or if the voltage exceeds the preset tolerances), the transfer function is inhibited.
StAtyS raises an alarm to warn the operator that the transfer is no longer possible.
Automatic return from the alternate source back to the preferred source may also occur following a manual transfer.
In the event of a short circuit at the output of the supplied equipment, the transfer function is inhibited. this stops the
short circuit from being transmitted along the other track and thus prevents the other source from being interrupted.
two types of transfer may occur, synchronous or asynchronous, according to the source synchronisation status and
the hardware configuration.
s
Ynchronous
transFer
Synchronous transfer occurs automatically when the two sources S1 and S2 are deemed to be synchronised, e.g.
when their phase deviation is within the tolerance window (st/- 15°). In this case, switching the source does
not alter the phase.
If the phase deviation exceeds this tolerance window, synchronous transfer is inhibited and automatic changeover to
the other source will not be possible. however, the transfer may in any event be executed in these conditions if the
system is configured for synchronous/asynchronous transfer.
NOTE: STATYS is configured for synchronous/asynchronous transfer by default.
It may be configured to “synchronous only” transfer for applications which are sensitive to phase shifts (advanced
parameters, see §10).
Most information processing equipment, servers, computer... are impervious to significant phase variations.
5. operatIng modeS
Impossible transfer
