ABB SACE Emax E1.2 Operating Instructions For The Design Engineer page 122

116 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
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Short voltage interruption
The short duration voltage drop is to be understood as a decrease in the RMS value of the line-to-line voltage
below the set threshold, for a duration less than 40 ms.
NOTE: Since the counter is based on the calculation of the RMS value, two sudden drops
in voltage of equal duration may be evaluated differently depending on when they occur (see
the attached example).
Drop detected
t
The alarm threshold available in the menu, V microinterr. Th, is expressed as %Un.
The cumulative (V microinterr.) and last day counters are available in the corresponding menus.
Short duration voltage increases
The short duration voltage increase is to be understood as an increase in the RMS value of the line-to-line
voltage above the set threshold, for a duration less than 40 ms.
NOTE: Since the counter is based on the calculation of the RMS value, two rapid increases
in voltage of equal duration may be evaluated differently depending on their amplitude (see
the attached example).
Increase detected
t
The alarm threshold available in the menu, V Spike Threshold, is expressed as %Un.
The cumulative (Peaks) and last-day counters are available in the corresponding menus.
Slow voltage drops
Slow voltage drops are the lowering of any line-to-line voltage, under one of the set thresholds, for a duration
greater than the set time.
The parameters that can be set for the control are available in the Sags submenu:
Parameter
V sag Th Short
V sag dur short
V sag Th Middle
V sag dur middle
V sag Th Long
V sag dur long
t
Description
It defines the first alarm threshold.
It is expressed as %Un.
In the event of dropping under the first alarm threshold, it defines the time
beyond which the alarm counter is increased.
It defines the second alarm threshold.
It is expressed as %Un.
In the event of dropping under the second alarm threshold, it defines the
time beyond which the alarm counter is increased.
It defines the third alarm threshold.
It is expressed as %Un.
In the event of dropping under the third alarm threshold, it defines the
time beyond which the alarm counter is increased.
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Drop not detected
t
Increase not detected
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