Weidmüller 610 - Configuration (Continued); Harmonics; Total Harmonic Distortion (THD); Measured Value Relay

292576780000/00/02-2018
Conguration
Harmonics
Harmonics are the integer multiple of a mains frequency.
The voltage mains frequency for the Energy Meter 610/610-PB
must be in the range between 45 and 65 Hz. The calculated volt-
age and current harmonics refer to this mains frequency.
Harmonics up to 40x the mains frequency are recorded.
The harmonics for currents are given in amperes and the harmon-
ics for voltages are given in volts.
Number of the harmonic
Phase L3
Current harmonic
Value
Fig.: Display of the 15th harmonic of the current in the L3 phase
(example).
Harmonics are not displayed in the factory default
setting.
Total Harmonic Distortion (THD)
THD is the ratio of the root mean square value of harmonics to the
root mean square value of the mains frequency.
Total Harmonic Distortion of the current (THDI):
THD
I
I
I
fund
nHarm
n
M
=
=
∑
1
2
2
.
Total Harmonic Distortion of the voltage (THDU):
THD
U
U
U
fund
nHarm
n
M
=
=
∑
1
2
2
.
Phase L3
Voltage
Value
Fig.: Display of the total harmonic distortion of the voltage from
the L3 phase (example).
Measured value relay
All measured values are calculated every 10/12 periods and can
be recalled once per second on the measured value displays. Two
methods are available for retrieving the measured value displays:
• The automatically changing display of selected measured val-
ues, referred to here as measured value relaying.
• Selection of a measured value display using buttons 1 and 2
from a preselected display prole.
Both methods are simultaneously available. Measured value relay-
ing is active if at least one measured value display is programmed
with a changeover time greater than 0 seconds.
If a button is pressed, the measured value displays of the selected
display prole can be browsed. If no button is pressed for about
60 seconds, the device switches to the measured value relay and
the measured values from the selected display change prole of
the programmed measured value displays are shown one after
the other.
Changeover time (addr. 039)
Adjustment range: 0 to 60 seconds
If 0 seconds are set, no changeover takes place between the
measured value displays selected for the measured value relay.
The changeover time applies for all display change proles.
Display change prole (addr. 038)
Adjustment range: 0 to 3
0 - Display changeover prole 1, by default.
1 - Display changeover prole 2, by default.
2 - Display changeover prole 3, by default.
3 - Customised display changeover prole.
Measured value displays
After return of the power supply, the Energy Meter 610/610-PB
shows the rst measured value panel from the current display pro-
le. In order to keep the selection of measured values to be dis-
played arranged in a clear manner, only one part of the available
measured values is pre-programmed for recall in the measured
value display by default. A different display prole can be selected
if other measured values are required to be shown on the Energy
Meter 610/610-PB display