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Power Quality Controller – PQC | Operating Manual | FRAKO
6.3.4.9 V Harmonics
Alarm limit 0 % to 100 % (increments of 0.01 %)
6.3.4.10 I Harmonics
Alarm limit 0 % to 100 %
(increments of 0.01%)
6.3.4.11 Short-term voltage blackout (voltage sag)
The voltage sag alarm is designed to protect the capac-
itors and their contactors against power cuts that are
short enough to make the capacitor contactors open
and immediately close again.
Alarm limit 50 % to 93 % (increments of 1 %)
Voltage blackout (sag) in % (100 % being the nominal supply voltage): This is the root-
mean-square voltage setting at which the voltage sag detection function is to react.
Presettings: Alarm given if voltage drops below 85 % of the nominal voltage.
– Voltage blackout (sag) 85 %
For this very important function to operate effectively, it is vitally important that the
phase selected for the instrument power supply to the switching outputs is the same
one selected for the voltage measurement.
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