Product overview
EL34xx
29
Version: 1.5
3.4
Current transformers
In principle, the choice of current transformer for the EL34xx is not critical. The internal resistance within the
current circuit of the EL34xx is so small that it is negligible for the calculation of the total resistances of the
current loop. The transformers should be able to produce a secondary rated current of 1 A. The primary
rated current I
pn
can be selected arbitrarily. The common permissible overload of 1.2 x I
pn
is no problem for
the EL34xx, but may lead to small measuring inaccuracies.
Accuracy
Please note that the overall accuracy of the set-up consisting of EL34xx and current transformers to a large
degree depends on the accuracy class of the transformers.
No approval as a billing meter
Even an arrangement with a current transformer of class 0.5 or better is not subject to approval and
certification. The EL34xx is not an approved billing meter within the meaning of the standard for
electricity meters (DIN 43 856).
NOTE
DC currents with the EL3453
DC currents can lead to saturation of the internal current transformers and thus to measurement errors!
Current types
The EL34xx can measure any current type up to a limiting proportion of 400 Hz. Since such currents are
frequently created by inverters and may contain frequencies of less than 50 Hz or even a DC component,
electronic transformers should be used for such applications.
Overcurrent limiting factor FS
The overcurrent limiting factor FS of a current transformer indicates at what multiple of the primary rated
current the current transformer changes to saturation mode, in order to protect the connected measuring
instruments.
NOTE
Attention! Risk of damage to the device!
The EL34xx-xxxx must not be subjected to continuous loads that exceed the current values specified in the
technical data! In systems, in which the overcurrent limiting factors of the transformers allow higher sec-
ondary currents, additional intermediate transformers with a suitable ratio should be used.
NOTE
Attention! Risk of damage to the device!
The EL3453-xxxx must not be permanently loaded with more than I
1
+ I
2
+ I
3
+ I
N
= 20 A total current across
all channels!
Protection against dangerous touch voltages
During appropriate operation of the EL34xx with associated current transformers, no dangerous voltages
occur. The secondary voltage is in the range of a few Volts. However, the following faults may lead to
excessive voltages:
• Open current circuit of one or several transformers
• Neutral conductor cut on the voltage measurement side of the EL34xx
• General insulation fault
Содержание EL34 Series
Страница 1: ...Documentation EL34xx 3 phase energy and power measurement terminals 1 5 2019 09 05 Version Date ...
Страница 2: ......
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 ...