MI 2792 PowerQ4 Plus
Operating the instrument
51
Table 3.48: Instrument screen symbols and abbreviations - TREND
Current recorder status;
Instrument
is
recording;
Instrument is busy (retrieving data from memory);
Instrument is not in recording mode.
Current instrument time.
U1, U2, U3,
UN, U12,
U23, U31
True effective value of voltage – U
Rms(10).
I1, I2, I3, IN True effective value of current – I
Rms(10).
Thd
Total harmonic distortion THD
U
and THD
I.
f
Frequency on reference channel.
Cursor position time.
Table 3.49: Keys functions - TREND
Zoom in.
Zoom out.
Select between the following signals:
Show voltage waveform;
Show current waveform.
Select between phase, neutral, all-phases and view:
Show trend for phase L1
Show trend for phase L2
Show trend for phase L3
Show trend for neutral channel
Summary of all phases trends
Switch to tabular METER view.
Toggle cursor assignment between waveform scope and RMS trend.
Set vertical zoom (Only if cursor assigned to waveform scope).
Move cursor position.
Return to the “WAVEFORM RECORDER” setup screen.
3.11 Inrush / Fast recorder
High inrush currents of motors can cause breakers to trip or fuses to open. Maximum
expected current during the inrush might be 6 to 14 times greater than the full load
current of the motor.
