Page 109 - MCCB-XT2-XT4

ABB | SACE Tmax XT

Over V Th and Under V Th Certain counters relating to the sequence measurements are available in the Counters - Day -1 and
Counters - Cumulative submenus:
Counters Description
Counts the number of times that the average value of the positive sequence
(in the set direction of rotation of the phases: 1-2-3) or negative sequence (in
Over V Th the set direction of rotation of the phases: 3-2-1) exceeds the V Threshold High
threshold. The count refers to the reference menu interval (previous day or
cumulative)
Counts the number of times that the average value of the positive sequence
(in the set direction of rotation of the phases: 1-2-3) or negative sequence (in
Under V Th the set direction of rotation of the phases: 3-2-1) falls below the V Threshold
Low threshold. The count refers to the reference menu interval (previous day or
cumulative)

Additional List
Counters (Over Voltage) Description
Last time stamp Date and time of last recording of the Over V Th counter
Last value Value of the last swell above the Over V Th [V] threshold
Actual number of O. Over V Th count for the current day
Actual [day -2 ... day -7] Over V Th count of the last seven days of activity, calculated using the
number of O. internal clock of the unit
Counters (Under Volta- Description
ge)
Last time stamp Date and time of last recording of the Under V Th counter
Last value Value of the last sag below the Under V Th [V] threshold
Actual number of O. Under V Th count for the current day
Actual [day -2 ... day -7] Under V Th count of the last seven days of activity, calculated using
number of O. the internal clock of the unit

V microinterr. (Interruption) The V microinterr counter should be understood as reduction of the RMS value of the line-to-line voltage
below the V microinterr. Th set threshold for less than 40 ms (short time voltage sag).
The counter is available in the two submenus Counters - Day -1 and Counters - Cumulative (previous day
or cumulative)
NOTE: Since the counter is based on the RMS value calculation, two rapid voltage sags of
equal duration may be evaluated differently, depending on when they occur:
Drop detected Drop not detected

t t

Additional List

Counters (Interrup-
tions) Description
Last instant Date and time of last recording of the V microinterr counter
Last value Value of last sag below the V microinterr [V] threshold
Last duration Value of last sag below the V microinterr [ms] threshold
Actual number of I. V microinterr count for the current day
Actual [day -2 ... day -7] V microinterr count of the last seven days of activity, calculated using the
number of I. internal clock of the unit

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