Fig. 36 Invalid El3Xx4 Configuration - Beckhoff EL3182 Documentation

Fig. 36: Invalid EL3xx4 configuration
The resulting CMP is 23.6 V, i.e. >> 10 V (applicable to EL30xx). The EL30x4/EL31x4 terminals should
therefore be configured such that CMP is always less than U
Summary
This results in certain concrete specifications for external connection with 0/4..20 mA sensors:
• We recommended connecting GND
improves the measuring accuracy of the EL30xx/31xx.
Please note the instructions relating to the U
• The U potential reference must be adhered to between CMP ↔ GND
CM
If this cannot be guaranteed, the single-channel version should be used.
• Terminal configuration:
◦ EL3xx1/EL3xx2: GND
GND should be connected externally such that condition 2 is met.
int
◦ EL3xx4: GND is connected with the negative power contact.
The external connection should be such that condition 2 is met.
If the sensor cable is shielded, the shield should not be connected with the GND
dedicated low-impedance shield point.
• If terminal points of several EL30xx/EL31xx terminals are connected with each other, ensure that
condition 2 is met.
Connection of GND
In the EL30x1/EL30x2 and EL31x1/EL31x2 terminals the internal GND, GND
to terminal contacts.
To achieve a precise measurement result GND
pedance potential, taking account the specifications for U
In the EL30x4/EL31x4 terminals GND
too the specifications for U
EL3182
with a low-impedance potential, because this significantly
int
potential reference.
CM
is connected to terminal point for external connection.
int
int
is already connected with the negative power contact. Here
int
must be followed.
CM
Version: 1.2
.
CM,max
and CMP
int
should be connected to a suitable external low-im-
int
.
CM
Mounting and wiring
↔ CMP .
ch(x) ch(y)
terminal point but with a
int
connection is fed out
int
41