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P OWER QUA LIT Y
3.3.4
Voltage dip is the condition of voltage dropping temporarily under the threshold level due to
an unexpected electrical system network disturbance. The dip threshold and hysteresis volt-
age settings are a percentage of the system rated voltage Un.
In single-phase system, when U
equal to or above the dip threshold plus the hysteresis, the alarm is reset.
In three-phase system, when U
The alarm is reset when the U
the hysteresis value.
Voltage dip supervision settings
Value range
Default value
Threshold
Value range
Default value
Step value
Hysteresis
Value range
Default value
Step value
Do not set the voltage dip threshold below the lowest measurable limit. i.e.
minimum 29 VAC (Phase to N) or 50 VAC (Phase to Phase).
For example, in a 240 VAC single phase system, the minimum setting should
not be lower than 12 % (29 VAC/240 VAC). While in a 400 VAC 3-phase system,
the minimum setting should not be lower than 13 % (50 VAC/400 VAC).
1T N C928 25 0M0 201
Voltage dip supervision
falls below the threshold, an alarm is triggered; when U
dip
of any phase falls below the threshold, an alarm is triggered.
dip
of three-phase are recovered to or above the threshold plus
dip
0=Disable 1=Enable
0
5-100 %
10 %
1 %
0-10 %
2 %
1 %
PR OD UCT FU NCTI ONS
is
dip
23
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