Product overview
EL34xx
28
Version: 1.5
application, it may make sense to regularly synchronize the clock with an external clock. By default, the clock
is set once at system startup based on the local Windows system time, taking into account the set time zone,
usually UTC.
In addition, the interval can also be restarted manually via the "Reset Interval" output bit or directly from the
application, for example to obtain statistics on a process that varies over time.
Calculation of the neutral current
Since the EL34xx terminals have direct access to the instantaneous current values of all three phases, the
neutral current can be calculated or estimated, assuming that no current is lost to the system (in other words:
the differential current is zero). The calculated (i.e. not measured) current value is output in index "
Calculated Neutral Line Current [
Since in the worst case all measurement errors add up, the maximum measurement error is correspondingly
higher.
The additional possibility of measuring a fourth current value in the EL3453 means that either the differential
current or the neutral current can be calculated. The other current can be measured directly using the fourth
current channel. Due to the usual conditions and the corresponding measurement tolerances, however, it
makes much more sense to measure the differential current with the aid of a summation current transformer
and have the neutral conductor current calculated. Further information on this can be found in the chapter
Power measurement including residual current measurement
.
Harmonic calculation
The EL34xx terminals perform an internal harmonic analysis for all current and voltage channels. For this
purpose, a fundamental wave in the frequency range from 45 to 65 Hz is determined at the beginning
(separately from the system frequency). The frequency value determined for the voltage harmonics can be
read, for example, from index 99 (plus channel offset) of the variable output values and the amplitude in volts
from index 98. The same applies to the current values - see "Variable output values".
The actual harmonic measured values are output as a percentage of the fundamental wave amplitude. It
should also be noted that the zero harmonic indicates the DC component of the signal.
Содержание EL34 Series
Страница 1: ...Documentation EL34xx 3 phase energy and power measurement terminals 1 5 2019 09 05 Version Date ...
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Страница 52: ...Mounting and wiring EL34xx 52 Version 1 5 Fig 35 Other installation positions ...
Страница 58: ...Mounting and wiring EL34xx 58 Version 1 5 EL3453 LEDs and connection Fig 40 EL3453 LED s ...
Страница 92: ...Commissioning EL34xx 92 Version 1 5 Fig 86 Incorrect driver settings for the Ethernet port ...
Страница 103: ...Commissioning EL34xx 103 Version 1 5 Fig 105 EtherCAT terminal in the TwinCAT tree left TwinCAT 2 right TwinCAT 3 ...
Страница 130: ...Commissioning EL34xx 130 Version 1 5 Fig 147 Process Data tab SM3 EL3443 ...
Страница 131: ...Commissioning EL34xx 131 Version 1 5 Fig 148 Process Data tab SM3 EL3453 ...
Страница 132: ...Commissioning EL34xx 132 Version 1 5 Fig 149 Process Data tab SM3 EL3483 ...
Страница 160: ...Commissioning EL34xx 160 Version 1 5 Index F802 PMX Guard Settings ...
Страница 183: ...Commissioning EL34xx 183 Version 1 5 Index F802 PMX Guard Settings ...
Страница 205: ...Commissioning EL34xx 205 Version 1 5 Index 1C13 TxPDO assign ...
Страница 214: ...Commissioning EL34xx 214 Version 1 5 Index F802 PMX Guard Settings ...
Страница 242: ...Commissioning EL34xx 242 Version 1 5 Index 1C13 TxPDO assign ...
Страница 259: ...Application examples EL34xx 259 Version 1 5 7 Application examples ...