Connection Examples - Siemens SIMATIC ET 200SP Manual

3.2

Connection examples

The following figures show the connection of the Energy Meter for three-phase and single-
phase measurements. Note that the Energy Meter must always be connected via a current
transformer.
Connection type
3P4W
Three-phase measurement,
4 wires
1P2W
Single-phase measurement,
2 conductors
If short-circuit resistance is ensured by conformity to IEC 61439-1:2009, there is no need for separate line protection for the
AI Energy Meter 400VAC ST.
Current transformer connection requirements
DIN VDE 0100-557 and IEC 60364-5-55 require the following for the connection of current
transformers:
● The secondary circuits of current transformers must not be grounded.
● Guards must not be used in the secondary circuits of current transformers.
● Transformer secondary cable insulation must be designed for the highest voltage of all
active components, or the secondary cables must be laid in such a way that their
insulation cannot touch any active components, such as busbars.
● Connection points must be provided for temporary measurements.
Analog input module AI Energy Meter 400VAC ST (6ES7134-6PA01-0BD0)
Manual, 10/2017, A5E36061895-AB
Wiring diagram
3.2 Connection examples
Comment
Any load
Connection with three current transformers
Measurement in an AC network with a cur-
rent transformer
Energy Meter supplies the value "0" for all
measured values of Phases 2 and 3 as well
as for some cross-phase measured values.
Wiring
19