LEGRAND 261 93 Mode D'emploi page 40

• Each anomaly has an independent delay time.
The anomaly must last consecutively longer than
the time specified for invalidating the voltage pres-
ence signal.
• All controls, except for the minimum voltage con-
trol, can be excluded separately by setting the
related parameter to OFF.
• The minimum and maximum voltage limits are
specified by setting up two thresholds each, one
which determines the point beyond which the volt-
age is no longer considered acceptable (e.g.
P2.01) and the other, closer to the nominal volt-
age, which determines the point in which it
becomes compatible again (e.g. P2.02). The dis-
Example of variation of the main line
voltage within the minimum and
maximum thresholds and relative
hystereses, with indication of the
presence / absence delay times. The
example considers the secondary line
voltage absent with its circuit breaker
open, hence the changeover times are
not shown. The INTERR. bar
represents the required status
of the main line switch.
14
P2.04
P2.05
V MAIN
P2.02
P2.01
LED VOK
P2.03
INTERR.
tance between these two thresholds determines the
hysteresis. For instance, it may be considered that
when the nominal value is below 80%, the voltage
may no longer be useable and that in order to be
considered useful, it must rise over 85%, thereby
determining a 5% hysteresis.
The same concept applies to the maximum
voltage.
• As for the frequency thresholds, there is a fixed 1%
hysteresis of the nominal frequency.
• The retrieval after a phase failure occurs when the
voltage rises above the minimum voltage retrieval
threshold.
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P2.15 P2.06 P2.05 P2.15