EL3356 - Connection

EL3356 - Connection 1:

Bridge feed

The EL3356 is designed for 6-wire connection. The measuring bridge is supplied by the supply voltage UV. By feeding the bridge supply voltage UV back from the measuring point to the EL3356, where it is measured as UREF, the distorting influence of line losses is minimized.
The supply voltage for the measuring bridge can be supplied via the power contacts and measured at connection points 3 and 7. Beckhoff power supply terminals, e.g. EL9510 (10 V) can be used for feeding the supply voltage into the power contacts. The EL3356 does not use the supply voltage supplied at the power contacts internally, but transfers it to the terminal points 3/7. Alternatively, the measuring bridge can be supplied by an external source.
For 4-wire connection and if the power contact supply is used, wire jumpers should be used between terminal points 3/6 and 5/7, in order to measure the supply voltage directly at the terminal.

Notice

Otherwise components may be damaged: avoid excessive supply voltage

The potential difference between +UREF and -UREF may be up to 13 V.
Ensure that the power contacts carry no more than 13 V, if the measuring bridge is supplied from terminal points 3 and 7.
Note the limit values for the supply voltage specified in the data sheets of the sensor manufacturers.

EL3356 - Connection 2:Fig.1: LEDs and connection EL3356, EL3356-00x0

Terminal point

Description

Name

No.

+ UDIFF

1

+ input measuring voltage

- UDIFF

2

- input measuring voltage

- UV

3

- supply voltage, connected to power contact within the terminal

Shield

4

Shield

+ UREF

5

+ input reference voltage

- UREF

6

- input reference voltage

+UV

7

+ supply voltage, connected to power contact within the terminal

Shield

8

Shield

Electrical isolation of the inputs and shielding concept

EL3356 - Connection 3:Fig.21: Electrical isolation of the inputs