Assignment planning
3.6 Configuring the electrical structure
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
55
Filtering the 24 V DC supply
If, with a configuration with ungrounded reference potential, you supply the IM 153-x from a
battery, you must suppress the 24 V DC power supply. To do this, use a Siemens mains
filter, e.g. B84102-K40.
Insulation monitoring
If, on account of double faults, dangerous situations could occur, then you must provide
insulation monitoring.
3.6.4 Configuration of the ET 200M with isolated modules
Definition
With a configuration using isolated modules, the reference potentials are electrically isolated
from the control circuit (M
internal
) and load circuit (M
external
) (refer also to the following figure).
Application area
You use electrically isolated modules for:
● all AC load circuits
● DC load circuits with separate reference potential, e.g.
– DC load circuits, the encoders for which have different reference potentials (e.g. if
grounded encoders are used far away from the controller and an equipotential
bonding isn´t possible)
– DC power circuits, the positive poles (L +) of which are grounded (battery circuit).
Isolated modules and grounding concept
You can use isolated modules irrespective of whether the reference potential of the ET 200M
is grounded or not.
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