PQube User Manual 2.1
Page 54 of 113
Snapshots
Your PQube records events when it senses a problem with the electric power. This information
about problems is useful, but sometimes it can also be helpful to see what your electric power
looks like when there isn’t a problem. Snapshots show you what your PQube is monitoring and are
trigger by an internal timer in your PQube (instead of a power quality event). Snapshots record all
of the same information that any other event recording includes.
To configure this feature, you can change the Waveform_Snapshot_Interval_In_Hours setting in the
Setup.ini file on your PQube’s SD card. Valid settings are OFF, 3, 6, or 24.
Snapshot Harmonics – Voltage and Current
Your PQube can generate voltage and current harmonic spectra up to the 50
th
whenever it
generates snapshot files – the corresponding CSV files go up to the 63
rd
harmonic. Edit the tag
called Enable_Snapshot_Harmonics in your Setup.ini file and set it to ON. Your sampling rate will
be set to 128 samples per cycle to measure harmonics.
The harmonic spectrum is calculated from a 10/12 cycle sample, using IEC 61000-4-7 methods. For
long term harmonic trending, please refer to the Trend_Settings section in your Setup.ini file and
edit the Trend_Harmonic_Interval_In_Minutes tag.
Long Events
A long event is an event that is 1 minute or longer. In general, your PQube makes its reports after
an event concludes: this is necessary to determine the event duration, the worst-case voltage
during the event, and so on. But if an event hasn’t concluded after 1 minute, your PQube will
report that an event is in progress. At the conclusion of the event, the PQube will report the
beginning timestamp plus the total duration. Waveform and RMS data will be available at the
beginning and end of event. For example, this can be useful for long interruptions where your
PQube loses instrument power.
Counter Events
Your PQube never misses an event. Sometimes many events can happen in very quick succession.
If other event(s) occur while your PQube is processing recorded data, your PQube will record text
events; and if it is overwhelmed by text events, your PQube will count the number of events as a
last resort.
Major Dip
Your PQube supports full PQ1 Power Quality Relay emulation. In the Setup.ini file, located the tag
called “Major_Dip_Threshold_Settings” and select a threshold curve from the following standards:
ITIC, CBEMA, SEMI_F47, STANDARD, SAMSUNG_POWER_VACCINE, MIL_STD_704E,
MIL_STD_1399, and CUSTOM.
If a voltage dip exceeds the selected threshold, it will trigger a Major Dip event.
CUSTOM
In firmware 2.1, you may customize your own Major Dip ride through curve with up to 4
depth/duration points. To use this function, make sure the Major_Dip_Threshold_Settings in the
Setup.ini file is set to CUSTOM, and locate the following tags:
Major_Dip_Threshold_Level_1_in_Percent=OFF
Major_Dip_Threshold_Level_1_Duration_in_Seconds=0
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