The EL3773 and EL3783 power monitoring terminals are designed

for state monitoring of 3-phase AC voltage systems. For each phase

voltages and currents are sampled as instantaneous values with a

resolution of 16 bits:

• for the EL3773 up to 288 Vrms/410 V DC and up to 1 Arms/1.5 A

DC

• for the EL3783 up to 400/690 V AC and up to 5 A AC, each with

“ExtendedRange”

The six channels are measured simultaneously based on the EtherCAT 

oversampling principle with a temporal resolution of up to  100 μs

(EL3773) or up to 50 μs (EL3783) and passed on to the control system.

With the processing power available there and in combination with the

TwinCAT Function TF3650. true RMS or power calculations as well as

complex user-specific algorithms can be calculated via the voltage and

current characteristics. Through the oversampling, the terminal is able

to measure at significantly shorter intervals than the cycle time of the

control system. AC and DC parameters must be connected and measured

with a common reference potential. Both of the terminals support

distributed clocks and can therefore measure synchronously with other

EtherCAT devices. However, they can also be operated without distributed

clocks.

The EL3783 offers the “ExtendedRange” feature enabling the use of the

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

measuring range.