ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions page 143

139 | © 2013 ABB | 1SDH001000R0002 - L7804
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Short duration voltage drops
The short duration voltage drop is to be understood as the reduction of any phase-to-phase
voltage below the set threshold, for a duration less than 40 ms.
The alarm threshold is expressed as % Un.
The corresponding alarm counter is called Interruptions.
Short duration voltage increases
The short duration voltage increase is to be understood as the increase in any phase-to-phase
voltage above the set threshold, for a duration less than 40 ms.
The alarm threshold is expressed as % Un.
The corresponding alarm counter is called Spikes.
Slow voltage drops
The slow voltage drop is the lowering of any phase-to-phase voltage, under one of the set
thresholds, for a duration greater than the set time.
The corresponding alarm counter is called Sags.
Parameters that can be set for the check are:
Parameter Description
Sag Threshold Defines the first alarm threshold.
(First Class) It is expressed as % Un.
Sag Time (First
In the event of dropping under the first alarm threshold, it defines
Class) the time beyond which the alarm counter is increased.
Sag Threshold
It defines the second alarm threshold.
(Second Class)
It is expressed as % Un.
Sag Time (Second In the event of dropping under the second alarm threshold, it
Class) defines the time beyond which the alarm counter is increased.
Sag Threshold Defines the third alarm threshold.
(Third Class) It is expressed as % Un.
Sag Time (Third In the event of dropping under the third alarm threshold, it defines
Class) the time beyond which the alarm counter is increased.
IMPORTANT: in order to intercept all the voltage drop events (both slow and
short duration drops), it is recommended to set:
• Sag Threshold (First Class) = Interruptions threshold.
• Sag Time (First Class) = 40ms.
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Ekip Touch protection release | 16 - Hi-Touch measurements
ABB | SACE Emax 2