Beckhoff EL3742 | EtherCAT Terminal, 2-channel analog input, current

The EL3742 analog input terminal handles signals in the

range between 0 and 20 mA. The voltage is digitized to

a resolution of 16 bits, and is transmitted, electrically

isolated, to the controller. The input channels of the

EtherCAT Terminal have differential inputs and possess

a common, internal ground potential.

The signals are oversampled with an adjustable, integer

multiple (oversampling factor: n) of the bus cycle frequency

(n microcycles per bus cycle). For each bus cycle, the

EtherCAT Terminal generates a process data block that

is collected and transferred during the next bus cycle.

The time base of the terminal can be synchronized

precisely with other EtherCAT devices via distributed

clocks. This procedure enables the temporal resolution

of the analog input signals to be increased to n times

the bus cycle time. In conjunction with the EL47xx

(analog output terminal with oversampling), responses

with equidistant time intervals, e.g. in the event of a

threshold value being exceeded, become possible.

The distributed clocks function enables several EL3742

devices to be synchronized in almost any configuration.

The maximum sampling rate per channel is 100 ksamples/s

(100.000 samples/s).

The EL3453 EtherCAT power measurement terminal has voltage

inputs for direct monitoring of high-capacity generators up to max.

690 V AC, as is common in the wind industry, for example.

No upstream voltage transformer is required. The four current

inputs are electrically isolated so that the terminal can be used

in all common grounded current transformer configurations such

as 2- or 3-transformer configurations with star or delta connectionz

incl. neutral conductor current measurement.

The EL3453 can be used for simple grid analysis up to the 63rd

harmonics analysis.

Alternatively, all readings can be combined in a power quality factor

for simplified diagnostics. Like all measured terminal data, the

harmonic content can be read via the process data.

The EL3453 offers the “ExtendedRange” feature enabling the use

of the full technical measuring range, which equals 130% of the

specified nominal measuring range.

In addition, the EL3453 comes with the option of transmitting the

times of the last voltage and current zero crossing to the controller

via XFC technology. This can be used, for example, to carry out

switching operations to suit the application.

The EL3483 EtherCAT Terminal enables the monitoring of relevant electrical

data of the supply network. The voltage is measured internally via direct

connection of L1. L2. L3 and N. The internal measured values are compared

with threshold values preset by the user. The result is available as digital

information in the process image. The EL3483 checks for the correct phase

order L1. L2. L3. phase failure, undervoltage and overvoltage, and possible

phase asymmetry. An error bit is set in the case of an incorrect phase order

or the failure of a phase. Should, for example, an asymmetry or voltage error

occur, only a warning bit is set initially. In addition, an internally calculated

mains quality factor provides information about the quality of the monitored

voltage supply. The EL3483 offers basic functionality for mains monitoring

and analysis.