Operation
51
RCMS460-490_D00067_03_M_XXEN/12.2017
Line 3: Minimum and maximum measured value after an alarm has
occurred.
Line 4: Address and measuring channel of the device sending the
message.
6.6.4 Menu 4: Harmonics
The analysis of the harmonics of the measured currents is displayed as a bar
and a current value. Harmonics are multiples of the rated frequency.
Example: Rated frequency = 50 Hz, 2nd Harmonics = 100 Hz.
The RCMS…-D… can only determine the harmonics currents correctly if the
selected rated frequency in menu "6. Settings-> General-> Rated frequ." suits
the current being monitored.
At 50 or 60 Hz, the current value of harmonics 1…40 is displayed; at 400 Hz the
current value of harmonics 1…5 is displayed.
THF: The total harmonic factor (THF) specifies the ratio of the har-
monics r.m.s value of an alternating quantity to the funda-
mental r.m.s. value. The smaller the THF, the more sinusoidal
the current signal.
If 50 or 60 Hz are selected in the "Cut-off frequency" menu
(see page 65) the THF cannot be determined. The display
indicates „- - -“ .
An analysis of the harmonics cannot be carried out in
disabled channels or channels with digital input. The display
indicates „- - -“ .
Channel:1
1
21mA
THF 3%
DC 3mA
1.
85mA
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