Connection Assignment; Fig. 9 El3773 - Beckhoff EL3773 Documentation

Mounting and wiring
5.7

Connection assignment

Caution: Risk of electric shock!
If you do not connect the terminal point N with the neutral conductor of your mains supply
(e.g. if the EL3773 is used purely for current measurements), terminal point N should be
WARNING
earthed, in order to avoid dangerous overvoltages in the event of a current transformer
fault!
Caution: Risk of electric shock!
Please note that many manufacturers do not permit their current transformers to be oper-
ated in no-load mode! Connect the EL3773 to the secondary windings of the current trans-
WARNING
formers before using the current transformer!
Fig. 30: EL3773
Connection
Terminal point Description
Name No.
L1 1 Phase L1
L2 2 Phase L2
L3 3 Phase L3
N 4 Neutral conductor N
(internally connected to terminal point I
capacitively connected to the earthing contact to the
mounting rail)
IL1 5 Consumer at phase L1
IL2 6 Consumer at phase L2
IL3 7 Consumer at phase L3
IN 8 Star point of the current transformers
(internally connected to terminal point N,
capacitively connected to the earthing contact to the
mounting rail)
40
,
N
Version: 2.5
Comment
Connections for the voltage
measurement. Please
observe the notes [} 40].
Connections for the current
transformers. Please
observe the notes [} 40].
EL3773